mirror of
https://github.com/darlinghq/darling-gdb.git
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df7e526582
This commit renames nine files that contain code used by both 32- and 64-bit Intel ports such that their names are prefixed with "x86" rather than "i386". All types, functions and variables within these files are likewise renamed such that their names are prefixed with "x86" rather than "i386". This makes GDB follow the convention used by gdbserver such that 32-bit Intel code lives in files called "i386-*", 64-bit Intel code lives in files called "amd64-*", and code for both 32- and 64-bit Intel lives in files called "x86-*". This commit only renames OS-independent files. The Linux ports of both GDB and gdbserver now follow the i386/amd64/x86 convention fully. Some ports still use the old convention where "i386" in file/function/ type/variable names can mean "32-bit only" or "32- and 64-bit" but I don't want to touch ports I can't fully test except where absolutely necessary. gdb/ChangeLog: * i386-nat.h: Renamed as... * x86-nat.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * i386-nat.c: Renamed as... * x86-nat.c: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * common/i386-xstate.h: Renamed as... * common/x86-xstate.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * nat/i386-cpuid.h: Renamed as... * nat/x86-cpuid.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * nat/i386-gcc-cpuid.h: Renamed as... * nat/x86-gcc-cpuid.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * nat/i386-dregs.h: Renamed as... * nat/x86-dregs.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * nat/i386-dregs.c: Renamed as... * nat/x86-dregs.c: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. gdb/gdbserver/ChangeLog: * i386-low.h: Renamed as... * x86-low.h: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated. * i386-low.c: Renamed as... * x86-low.c: New file. All type, function and variable name prefixes changed from "i386_" to "x86_". All references updated.
1775 lines
48 KiB
C
1775 lines
48 KiB
C
/* Intel 387 floating point stuff.
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Copyright (C) 1988-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "doublest.h"
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#include "floatformat.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "language.h"
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#include "regcache.h"
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#include "value.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "x86-xstate.h"
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/* Print the floating point number specified by RAW. */
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static void
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print_i387_value (struct gdbarch *gdbarch,
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const gdb_byte *raw, struct ui_file *file)
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{
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DOUBLEST value;
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/* Using extract_typed_floating here might affect the representation
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of certain numbers such as NaNs, even if GDB is running natively.
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This is fine since our caller already detects such special
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numbers and we print the hexadecimal representation anyway. */
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value = extract_typed_floating (raw, i387_ext_type (gdbarch));
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/* We try to print 19 digits. The last digit may or may not contain
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garbage, but we'd better print one too many. We need enough room
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to print the value, 1 position for the sign, 1 for the decimal
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point, 19 for the digits and 6 for the exponent adds up to 27. */
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#ifdef PRINTF_HAS_LONG_DOUBLE
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fprintf_filtered (file, " %-+27.19Lg", (long double) value);
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#else
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fprintf_filtered (file, " %-+27.19g", (double) value);
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#endif
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}
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/* Print the classification for the register contents RAW. */
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static void
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print_i387_ext (struct gdbarch *gdbarch,
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const gdb_byte *raw, struct ui_file *file)
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{
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int sign;
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int integer;
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unsigned int exponent;
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unsigned long fraction[2];
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sign = raw[9] & 0x80;
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integer = raw[7] & 0x80;
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exponent = (((raw[9] & 0x7f) << 8) | raw[8]);
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fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]);
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fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16)
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| (raw[5] << 8) | raw[4]);
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if (exponent == 0x7fff && integer)
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{
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if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000)
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/* Infinity. */
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fprintf_filtered (file, " %cInf", (sign ? '-' : '+'));
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else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000)
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/* Real Indefinite (QNaN). */
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fputs_unfiltered (" Real Indefinite (QNaN)", file);
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else if (fraction[1] & 0x40000000)
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/* QNaN. */
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fputs_filtered (" QNaN", file);
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else
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/* SNaN. */
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fputs_filtered (" SNaN", file);
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}
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else if (exponent < 0x7fff && exponent > 0x0000 && integer)
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/* Normal. */
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print_i387_value (gdbarch, raw, file);
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else if (exponent == 0x0000)
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{
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/* Denormal or zero. */
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print_i387_value (gdbarch, raw, file);
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if (integer)
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/* Pseudo-denormal. */
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fputs_filtered (" Pseudo-denormal", file);
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else if (fraction[0] || fraction[1])
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/* Denormal. */
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fputs_filtered (" Denormal", file);
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}
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else
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/* Unsupported. */
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fputs_filtered (" Unsupported", file);
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}
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/* Print the status word STATUS. If STATUS_P is false, then STATUS
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was unavailable. */
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static void
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print_i387_status_word (int status_p,
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unsigned int status, struct ui_file *file)
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{
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fprintf_filtered (file, "Status Word: ");
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if (!status_p)
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{
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fprintf_filtered (file, "%s\n", _("<unavailable>"));
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return;
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}
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fprintf_filtered (file, "%s", hex_string_custom (status, 4));
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fputs_filtered (" ", file);
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fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " ");
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fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " ");
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fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " ");
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fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " ");
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fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " ");
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fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " ");
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fputs_filtered (" ", file);
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fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " ");
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fputs_filtered (" ", file);
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fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " ");
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fputs_filtered (" ", file);
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fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " ");
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fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " ");
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fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " ");
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fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " ");
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fputs_filtered ("\n", file);
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fprintf_filtered (file,
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" TOP: %d\n", ((status >> 11) & 7));
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}
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/* Print the control word CONTROL. If CONTROL_P is false, then
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CONTROL was unavailable. */
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static void
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print_i387_control_word (int control_p,
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unsigned int control, struct ui_file *file)
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{
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fprintf_filtered (file, "Control Word: ");
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if (!control_p)
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{
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fprintf_filtered (file, "%s\n", _("<unavailable>"));
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return;
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}
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fprintf_filtered (file, "%s", hex_string_custom (control, 4));
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fputs_filtered (" ", file);
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fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " ");
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fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " ");
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fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " ");
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fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " ");
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fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " ");
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fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " ");
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fputs_filtered ("\n", file);
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fputs_filtered (" PC: ", file);
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switch ((control >> 8) & 3)
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{
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case 0:
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fputs_filtered ("Single Precision (24-bits)\n", file);
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break;
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case 1:
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fputs_filtered ("Reserved\n", file);
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break;
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case 2:
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fputs_filtered ("Double Precision (53-bits)\n", file);
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break;
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case 3:
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fputs_filtered ("Extended Precision (64-bits)\n", file);
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break;
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}
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fputs_filtered (" RC: ", file);
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switch ((control >> 10) & 3)
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{
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case 0:
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fputs_filtered ("Round to nearest\n", file);
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break;
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case 1:
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fputs_filtered ("Round down\n", file);
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break;
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case 2:
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fputs_filtered ("Round up\n", file);
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break;
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case 3:
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fputs_filtered ("Round toward zero\n", file);
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break;
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}
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}
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/* Print out the i387 floating point state. Note that we ignore FRAME
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in the code below. That's OK since floating-point registers are
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never saved on the stack. */
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void
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i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
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struct frame_info *frame, const char *args)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
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ULONGEST fctrl;
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int fctrl_p;
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ULONGEST fstat;
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int fstat_p;
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ULONGEST ftag;
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int ftag_p;
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ULONGEST fiseg;
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int fiseg_p;
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ULONGEST fioff;
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int fioff_p;
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ULONGEST foseg;
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int foseg_p;
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ULONGEST fooff;
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int fooff_p;
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ULONGEST fop;
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int fop_p;
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int fpreg;
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int top;
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gdb_assert (gdbarch == get_frame_arch (frame));
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fctrl_p = read_frame_register_unsigned (frame,
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I387_FCTRL_REGNUM (tdep), &fctrl);
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fstat_p = read_frame_register_unsigned (frame,
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I387_FSTAT_REGNUM (tdep), &fstat);
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ftag_p = read_frame_register_unsigned (frame,
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I387_FTAG_REGNUM (tdep), &ftag);
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fiseg_p = read_frame_register_unsigned (frame,
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I387_FISEG_REGNUM (tdep), &fiseg);
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fioff_p = read_frame_register_unsigned (frame,
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I387_FIOFF_REGNUM (tdep), &fioff);
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foseg_p = read_frame_register_unsigned (frame,
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I387_FOSEG_REGNUM (tdep), &foseg);
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fooff_p = read_frame_register_unsigned (frame,
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I387_FOOFF_REGNUM (tdep), &fooff);
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fop_p = read_frame_register_unsigned (frame,
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I387_FOP_REGNUM (tdep), &fop);
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if (fstat_p)
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{
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top = ((fstat >> 11) & 7);
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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struct value *regval;
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int regnum;
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int i;
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int tag = -1;
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fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg);
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if (ftag_p)
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{
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tag = (ftag >> (fpreg * 2)) & 3;
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switch (tag)
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{
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case 0:
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fputs_filtered ("Valid ", file);
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break;
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case 1:
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fputs_filtered ("Zero ", file);
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break;
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case 2:
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fputs_filtered ("Special ", file);
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break;
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case 3:
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fputs_filtered ("Empty ", file);
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break;
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}
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}
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else
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fputs_filtered ("Unknown ", file);
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regnum = (fpreg + 8 - top) % 8 + I387_ST0_REGNUM (tdep);
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regval = get_frame_register_value (frame, regnum);
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if (value_entirely_available (regval))
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{
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const gdb_byte *raw = value_contents (regval);
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fputs_filtered ("0x", file);
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for (i = 9; i >= 0; i--)
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fprintf_filtered (file, "%02x", raw[i]);
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if (tag != -1 && tag != 3)
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print_i387_ext (gdbarch, raw, file);
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}
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else
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fprintf_filtered (file, "%s", _("<unavailable>"));
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fputs_filtered ("\n", file);
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}
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}
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fputs_filtered ("\n", file);
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print_i387_status_word (fstat_p, fstat, file);
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print_i387_control_word (fctrl_p, fctrl, file);
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fprintf_filtered (file, "Tag Word: %s\n",
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ftag_p ? hex_string_custom (ftag, 4) : _("<unavailable>"));
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fprintf_filtered (file, "Instruction Pointer: %s:",
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fiseg_p ? hex_string_custom (fiseg, 2) : _("<unavailable>"));
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fprintf_filtered (file, "%s\n",
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fioff_p ? hex_string_custom (fioff, 8) : _("<unavailable>"));
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fprintf_filtered (file, "Operand Pointer: %s:",
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foseg_p ? hex_string_custom (foseg, 2) : _("<unavailable>"));
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fprintf_filtered (file, "%s\n",
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fooff_p ? hex_string_custom (fooff, 8) : _("<unavailable>"));
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fprintf_filtered (file, "Opcode: %s\n",
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fop_p
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? (hex_string_custom (fop ? (fop | 0xd800) : 0, 4))
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: _("<unavailable>"));
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}
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/* Return nonzero if a value of type TYPE stored in register REGNUM
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needs any special handling. */
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int
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i387_convert_register_p (struct gdbarch *gdbarch, int regnum,
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struct type *type)
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{
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if (i386_fp_regnum_p (gdbarch, regnum))
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{
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/* Floating point registers must be converted unless we are
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accessing them in their hardware type. */
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if (type == i387_ext_type (gdbarch))
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return 0;
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else
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return 1;
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}
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return 0;
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}
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/* Read a value of type TYPE from register REGNUM in frame FRAME, and
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return its contents in TO. */
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int
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i387_register_to_value (struct frame_info *frame, int regnum,
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struct type *type, gdb_byte *to,
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int *optimizedp, int *unavailablep)
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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gdb_byte from[I386_MAX_REGISTER_SIZE];
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gdb_assert (i386_fp_regnum_p (gdbarch, regnum));
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/* We only support floating-point values. */
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if (TYPE_CODE (type) != TYPE_CODE_FLT)
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{
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warning (_("Cannot convert floating-point register value "
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"to non-floating-point type."));
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*optimizedp = *unavailablep = 0;
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return 0;
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}
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/* Convert to TYPE. */
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if (!get_frame_register_bytes (frame, regnum, 0, TYPE_LENGTH (type),
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from, optimizedp, unavailablep))
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return 0;
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convert_typed_floating (from, i387_ext_type (gdbarch), to, type);
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*optimizedp = *unavailablep = 0;
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return 1;
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}
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/* Write the contents FROM of a value of type TYPE into register
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REGNUM in frame FRAME. */
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void
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i387_value_to_register (struct frame_info *frame, int regnum,
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struct type *type, const gdb_byte *from)
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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gdb_byte to[I386_MAX_REGISTER_SIZE];
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gdb_assert (i386_fp_regnum_p (gdbarch, regnum));
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/* We only support floating-point values. */
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if (TYPE_CODE (type) != TYPE_CODE_FLT)
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{
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warning (_("Cannot convert non-floating-point type "
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"to floating-point register value."));
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return;
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}
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/* Convert from TYPE. */
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convert_typed_floating (from, type, to, i387_ext_type (gdbarch));
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put_frame_register (frame, regnum, to);
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}
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||
|
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/* Handle FSAVE and FXSAVE formats. */
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/* At fsave_offset[REGNUM] you'll find the offset to the location in
|
||
the data structure used by the "fsave" instruction where GDB
|
||
register REGNUM is stored. */
|
||
|
||
static int fsave_offset[] =
|
||
{
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||
28 + 0 * 10, /* %st(0) ... */
|
||
28 + 1 * 10,
|
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28 + 2 * 10,
|
||
28 + 3 * 10,
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28 + 4 * 10,
|
||
28 + 5 * 10,
|
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28 + 6 * 10,
|
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28 + 7 * 10, /* ... %st(7). */
|
||
0, /* `fctrl' (16 bits). */
|
||
4, /* `fstat' (16 bits). */
|
||
8, /* `ftag' (16 bits). */
|
||
16, /* `fiseg' (16 bits). */
|
||
12, /* `fioff'. */
|
||
24, /* `foseg' (16 bits). */
|
||
20, /* `fooff'. */
|
||
18 /* `fop' (bottom 11 bits). */
|
||
};
|
||
|
||
#define FSAVE_ADDR(tdep, fsave, regnum) \
|
||
(fsave + fsave_offset[regnum - I387_ST0_REGNUM (tdep)])
|
||
|
||
|
||
/* Fill register REGNUM in REGCACHE with the appropriate value from
|
||
*FSAVE. This function masks off any of the reserved bits in
|
||
*FSAVE. */
|
||
|
||
void
|
||
i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
const gdb_byte *regs = fsave;
|
||
int i;
|
||
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
|
||
for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
if (fsave == NULL)
|
||
{
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
continue;
|
||
}
|
||
|
||
/* Most of the FPU control registers occupy only 16 bits in the
|
||
fsave area. Give those a special treatment. */
|
||
if (i >= I387_FCTRL_REGNUM (tdep)
|
||
&& i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte val[4];
|
||
|
||
memcpy (val, FSAVE_ADDR (tdep, regs, i), 2);
|
||
val[2] = val[3] = 0;
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
val[1] &= ((1 << 3) - 1);
|
||
regcache_raw_supply (regcache, i, val);
|
||
}
|
||
else
|
||
regcache_raw_supply (regcache, i, FSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
|
||
/* Provide dummy values for the SSE registers. */
|
||
for (i = I387_XMM0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
if (regnum == -1 || regnum == I387_MXCSR_REGNUM (tdep))
|
||
{
|
||
gdb_byte buf[4];
|
||
|
||
store_unsigned_integer (buf, 4, byte_order, 0x1f80);
|
||
regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), buf);
|
||
}
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a floating-point register) in *FSAVE
|
||
with the value from REGCACHE. If REGNUM is -1, do this for all
|
||
registers. This function doesn't touch any of the reserved bits in
|
||
*FSAVE. */
|
||
|
||
void
|
||
i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
|
||
gdb_byte *regs = fsave;
|
||
int i;
|
||
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
|
||
for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
/* Most of the FPU control registers occupy only 16 bits in
|
||
the fsave area. Give those a special treatment. */
|
||
if (i >= I387_FCTRL_REGNUM (tdep)
|
||
&& i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte buf[4];
|
||
|
||
regcache_raw_collect (regcache, i, buf);
|
||
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
{
|
||
/* The opcode occupies only 11 bits. Make sure we
|
||
don't touch the other bits. */
|
||
buf[1] &= ((1 << 3) - 1);
|
||
buf[1] |= ((FSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1));
|
||
}
|
||
memcpy (FSAVE_ADDR (tdep, regs, i), buf, 2);
|
||
}
|
||
else
|
||
regcache_raw_collect (regcache, i, FSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
|
||
/* At fxsave_offset[REGNUM] you'll find the offset to the location in
|
||
the data structure used by the "fxsave" instruction where GDB
|
||
register REGNUM is stored. */
|
||
|
||
static int fxsave_offset[] =
|
||
{
|
||
32, /* %st(0) through ... */
|
||
48,
|
||
64,
|
||
80,
|
||
96,
|
||
112,
|
||
128,
|
||
144, /* ... %st(7) (80 bits each). */
|
||
0, /* `fctrl' (16 bits). */
|
||
2, /* `fstat' (16 bits). */
|
||
4, /* `ftag' (16 bits). */
|
||
12, /* `fiseg' (16 bits). */
|
||
8, /* `fioff'. */
|
||
20, /* `foseg' (16 bits). */
|
||
16, /* `fooff'. */
|
||
6, /* `fop' (bottom 11 bits). */
|
||
160 + 0 * 16, /* %xmm0 through ... */
|
||
160 + 1 * 16,
|
||
160 + 2 * 16,
|
||
160 + 3 * 16,
|
||
160 + 4 * 16,
|
||
160 + 5 * 16,
|
||
160 + 6 * 16,
|
||
160 + 7 * 16,
|
||
160 + 8 * 16,
|
||
160 + 9 * 16,
|
||
160 + 10 * 16,
|
||
160 + 11 * 16,
|
||
160 + 12 * 16,
|
||
160 + 13 * 16,
|
||
160 + 14 * 16,
|
||
160 + 15 * 16, /* ... %xmm15 (128 bits each). */
|
||
};
|
||
|
||
#define FXSAVE_ADDR(tdep, fxsave, regnum) \
|
||
(fxsave + fxsave_offset[regnum - I387_ST0_REGNUM (tdep)])
|
||
|
||
/* We made an unfortunate choice in putting %mxcsr after the SSE
|
||
registers %xmm0-%xmm7 instead of before, since it makes supporting
|
||
the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we
|
||
don't include the offset for %mxcsr here above. */
|
||
|
||
#define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
|
||
|
||
static int i387_tag (const gdb_byte *raw);
|
||
|
||
|
||
/* Fill register REGNUM in REGCACHE with the appropriate
|
||
floating-point or SSE register value from *FXSAVE. This function
|
||
masks off any of the reserved bits in *FXSAVE. */
|
||
|
||
void
|
||
i387_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
|
||
const gdb_byte *regs = fxsave;
|
||
int i;
|
||
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
gdb_assert (tdep->num_xmm_regs > 0);
|
||
|
||
for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
if (regs == NULL)
|
||
{
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
continue;
|
||
}
|
||
|
||
/* Most of the FPU control registers occupy only 16 bits in
|
||
the fxsave area. Give those a special treatment. */
|
||
if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep)
|
||
&& i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte val[4];
|
||
|
||
memcpy (val, FXSAVE_ADDR (tdep, regs, i), 2);
|
||
val[2] = val[3] = 0;
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
val[1] &= ((1 << 3) - 1);
|
||
else if (i== I387_FTAG_REGNUM (tdep))
|
||
{
|
||
/* The fxsave area contains a simplified version of
|
||
the tag word. We have to look at the actual 80-bit
|
||
FP data to recreate the traditional i387 tag word. */
|
||
|
||
unsigned long ftag = 0;
|
||
int fpreg;
|
||
int top;
|
||
|
||
top = ((FXSAVE_ADDR (tdep, regs,
|
||
I387_FSTAT_REGNUM (tdep)))[1] >> 3);
|
||
top &= 0x7;
|
||
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
int tag;
|
||
|
||
if (val[0] & (1 << fpreg))
|
||
{
|
||
int thisreg = (fpreg + 8 - top) % 8
|
||
+ I387_ST0_REGNUM (tdep);
|
||
tag = i387_tag (FXSAVE_ADDR (tdep, regs, thisreg));
|
||
}
|
||
else
|
||
tag = 3; /* Empty */
|
||
|
||
ftag |= tag << (2 * fpreg);
|
||
}
|
||
val[0] = ftag & 0xff;
|
||
val[1] = (ftag >> 8) & 0xff;
|
||
}
|
||
regcache_raw_supply (regcache, i, val);
|
||
}
|
||
else
|
||
regcache_raw_supply (regcache, i, FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
|
||
if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
|
||
{
|
||
if (regs == NULL)
|
||
regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), NULL);
|
||
else
|
||
regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep),
|
||
FXSAVE_MXCSR_ADDR (regs));
|
||
}
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a floating-point or SSE register) in
|
||
*FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for
|
||
all registers. This function doesn't touch any of the reserved
|
||
bits in *FXSAVE. */
|
||
|
||
void
|
||
i387_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
|
||
gdb_byte *regs = fxsave;
|
||
int i;
|
||
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
gdb_assert (tdep->num_xmm_regs > 0);
|
||
|
||
for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
/* Most of the FPU control registers occupy only 16 bits in
|
||
the fxsave area. Give those a special treatment. */
|
||
if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep)
|
||
&& i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte buf[4];
|
||
|
||
regcache_raw_collect (regcache, i, buf);
|
||
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
{
|
||
/* The opcode occupies only 11 bits. Make sure we
|
||
don't touch the other bits. */
|
||
buf[1] &= ((1 << 3) - 1);
|
||
buf[1] |= ((FXSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1));
|
||
}
|
||
else if (i == I387_FTAG_REGNUM (tdep))
|
||
{
|
||
/* Converting back is much easier. */
|
||
|
||
unsigned short ftag;
|
||
int fpreg;
|
||
|
||
ftag = (buf[1] << 8) | buf[0];
|
||
buf[0] = 0;
|
||
buf[1] = 0;
|
||
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
int tag = (ftag >> (fpreg * 2)) & 3;
|
||
|
||
if (tag != 3)
|
||
buf[0] |= (1 << fpreg);
|
||
}
|
||
}
|
||
memcpy (FXSAVE_ADDR (tdep, regs, i), buf, 2);
|
||
}
|
||
else
|
||
regcache_raw_collect (regcache, i, FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
|
||
if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
|
||
regcache_raw_collect (regcache, I387_MXCSR_REGNUM (tdep),
|
||
FXSAVE_MXCSR_ADDR (regs));
|
||
}
|
||
|
||
/* `xstate_bv' is at byte offset 512. */
|
||
#define XSAVE_XSTATE_BV_ADDR(xsave) (xsave + 512)
|
||
|
||
/* At xsave_avxh_offset[REGNUM] you'll find the offset to the location in
|
||
the upper 128bit of AVX register data structure used by the "xsave"
|
||
instruction where GDB register REGNUM is stored. */
|
||
|
||
static int xsave_avxh_offset[] =
|
||
{
|
||
576 + 0 * 16, /* Upper 128bit of %ymm0 through ... */
|
||
576 + 1 * 16,
|
||
576 + 2 * 16,
|
||
576 + 3 * 16,
|
||
576 + 4 * 16,
|
||
576 + 5 * 16,
|
||
576 + 6 * 16,
|
||
576 + 7 * 16,
|
||
576 + 8 * 16,
|
||
576 + 9 * 16,
|
||
576 + 10 * 16,
|
||
576 + 11 * 16,
|
||
576 + 12 * 16,
|
||
576 + 13 * 16,
|
||
576 + 14 * 16,
|
||
576 + 15 * 16 /* Upper 128bit of ... %ymm15 (128 bits each). */
|
||
};
|
||
|
||
#define XSAVE_AVXH_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_avxh_offset[regnum - I387_YMM0H_REGNUM (tdep)])
|
||
|
||
/* At xsave_ymm_avx512_offset[REGNUM] you'll find the offset to the location in
|
||
the upper 128bit of ZMM register data structure used by the "xsave"
|
||
instruction where GDB register REGNUM is stored. */
|
||
|
||
static int xsave_ymm_avx512_offset[] =
|
||
{
|
||
/* HI16_ZMM_area + 16 bytes + regnum* 64 bytes. */
|
||
1664 + 16 + 0 * 64, /* %ymm16 through... */
|
||
1664 + 16 + 1 * 64,
|
||
1664 + 16 + 2 * 64,
|
||
1664 + 16 + 3 * 64,
|
||
1664 + 16 + 4 * 64,
|
||
1664 + 16 + 5 * 64,
|
||
1664 + 16 + 6 * 64,
|
||
1664 + 16 + 7 * 64,
|
||
1664 + 16 + 8 * 64,
|
||
1664 + 16 + 9 * 64,
|
||
1664 + 16 + 10 * 64,
|
||
1664 + 16 + 11 * 64,
|
||
1664 + 16 + 12 * 64,
|
||
1664 + 16 + 13 * 64,
|
||
1664 + 16 + 14 * 64,
|
||
1664 + 16 + 15 * 64 /* ... %ymm31 (128 bits each). */
|
||
};
|
||
|
||
#define XSAVE_YMM_AVX512_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_ymm_avx512_offset[regnum - I387_YMM16H_REGNUM (tdep)])
|
||
|
||
static int xsave_xmm_avx512_offset[] =
|
||
{
|
||
1664 + 0 * 64, /* %ymm16 through... */
|
||
1664 + 1 * 64,
|
||
1664 + 2 * 64,
|
||
1664 + 3 * 64,
|
||
1664 + 4 * 64,
|
||
1664 + 5 * 64,
|
||
1664 + 6 * 64,
|
||
1664 + 7 * 64,
|
||
1664 + 8 * 64,
|
||
1664 + 9 * 64,
|
||
1664 + 10 * 64,
|
||
1664 + 11 * 64,
|
||
1664 + 12 * 64,
|
||
1664 + 13 * 64,
|
||
1664 + 14 * 64,
|
||
1664 + 15 * 64 /* ... %ymm31 (128 bits each). */
|
||
};
|
||
|
||
#define XSAVE_XMM_AVX512_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_xmm_avx512_offset[regnum - I387_XMM16_REGNUM (tdep)])
|
||
|
||
static int xsave_mpx_offset[] = {
|
||
960 + 0 * 16, /* bnd0r...bnd3r registers. */
|
||
960 + 1 * 16,
|
||
960 + 2 * 16,
|
||
960 + 3 * 16,
|
||
1024 + 0 * 8, /* bndcfg ... bndstatus. */
|
||
1024 + 1 * 8,
|
||
};
|
||
|
||
#define XSAVE_MPX_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_mpx_offset[regnum - I387_BND0R_REGNUM (tdep)])
|
||
|
||
/* At xsave_avx512__h_offset[REGNUM] you find the offset to the location
|
||
of the AVX512 opmask register data structure used by the "xsave"
|
||
instruction where GDB register REGNUM is stored. */
|
||
|
||
static int xsave_avx512_k_offset[] =
|
||
{
|
||
1088 + 0 * 8, /* %k0 through... */
|
||
1088 + 1 * 8,
|
||
1088 + 2 * 8,
|
||
1088 + 3 * 8,
|
||
1088 + 4 * 8,
|
||
1088 + 5 * 8,
|
||
1088 + 6 * 8,
|
||
1088 + 7 * 8 /* %k7 (64 bits each). */
|
||
};
|
||
|
||
#define XSAVE_AVX512_K_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_avx512_k_offset[regnum - I387_K0_REGNUM (tdep)])
|
||
|
||
/* At xsave_avx512_zmm_h_offset[REGNUM] you find the offset to the location in
|
||
the upper 256bit of AVX512 ZMMH register data structure used by the "xsave"
|
||
instruction where GDB register REGNUM is stored. */
|
||
|
||
static int xsave_avx512_zmm_h_offset[] =
|
||
{
|
||
1152 + 0 * 32,
|
||
1152 + 1 * 32, /* Upper 256bit of %zmmh0 through... */
|
||
1152 + 2 * 32,
|
||
1152 + 3 * 32,
|
||
1152 + 4 * 32,
|
||
1152 + 5 * 32,
|
||
1152 + 6 * 32,
|
||
1152 + 7 * 32,
|
||
1152 + 8 * 32,
|
||
1152 + 9 * 32,
|
||
1152 + 10 * 32,
|
||
1152 + 11 * 32,
|
||
1152 + 12 * 32,
|
||
1152 + 13 * 32,
|
||
1152 + 14 * 32,
|
||
1152 + 15 * 32, /* Upper 256bit of... %zmmh15 (256 bits each). */
|
||
1664 + 32 + 0 * 64, /* Upper 256bit of... %zmmh16 (256 bits each). */
|
||
1664 + 32 + 1 * 64,
|
||
1664 + 32 + 2 * 64,
|
||
1664 + 32 + 3 * 64,
|
||
1664 + 32 + 4 * 64,
|
||
1664 + 32 + 5 * 64,
|
||
1664 + 32 + 6 * 64,
|
||
1664 + 32 + 7 * 64,
|
||
1664 + 32 + 8 * 64,
|
||
1664 + 32 + 9 * 64,
|
||
1664 + 32 + 10 * 64,
|
||
1664 + 32 + 11 * 64,
|
||
1664 + 32 + 12 * 64,
|
||
1664 + 32 + 13 * 64,
|
||
1664 + 32 + 14 * 64,
|
||
1664 + 32 + 15 * 64 /* Upper 256bit of... %zmmh31 (256 bits each). */
|
||
};
|
||
|
||
#define XSAVE_AVX512_ZMM_H_ADDR(tdep, xsave, regnum) \
|
||
(xsave + xsave_avx512_zmm_h_offset[regnum - I387_ZMM0H_REGNUM (tdep)])
|
||
|
||
/* Similar to i387_supply_fxsave, but use XSAVE extended state. */
|
||
|
||
void
|
||
i387_supply_xsave (struct regcache *regcache, int regnum,
|
||
const void *xsave)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
const gdb_byte *regs = xsave;
|
||
int i;
|
||
unsigned int clear_bv;
|
||
static const gdb_byte zero[MAX_REGISTER_SIZE] = { 0 };
|
||
enum
|
||
{
|
||
none = 0x0,
|
||
x87 = 0x1,
|
||
sse = 0x2,
|
||
avxh = 0x4,
|
||
mpx = 0x8,
|
||
avx512_k = 0x10,
|
||
avx512_zmm_h = 0x20,
|
||
avx512_ymmh_avx512 = 0x40,
|
||
avx512_xmm_avx512 = 0x80,
|
||
all = x87 | sse | avxh | mpx | avx512_k | avx512_zmm_h
|
||
| avx512_ymmh_avx512 | avx512_xmm_avx512
|
||
} regclass;
|
||
|
||
gdb_assert (regs != NULL);
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
gdb_assert (tdep->num_xmm_regs > 0);
|
||
|
||
if (regnum == -1)
|
||
regclass = all;
|
||
else if (regnum >= I387_ZMM0H_REGNUM (tdep)
|
||
&& regnum < I387_ZMMENDH_REGNUM (tdep))
|
||
regclass = avx512_zmm_h;
|
||
else if (regnum >= I387_K0_REGNUM (tdep)
|
||
&& regnum < I387_KEND_REGNUM (tdep))
|
||
regclass = avx512_k;
|
||
else if (regnum >= I387_YMM16H_REGNUM (tdep)
|
||
&& regnum < I387_YMMH_AVX512_END_REGNUM (tdep))
|
||
regclass = avx512_ymmh_avx512;
|
||
else if (regnum >= I387_XMM16_REGNUM (tdep)
|
||
&& regnum < I387_XMM_AVX512_END_REGNUM (tdep))
|
||
regclass = avx512_xmm_avx512;
|
||
else if (regnum >= I387_YMM0H_REGNUM (tdep)
|
||
&& regnum < I387_YMMENDH_REGNUM (tdep))
|
||
regclass = avxh;
|
||
else if (regnum >= I387_BND0R_REGNUM (tdep)
|
||
&& regnum < I387_MPXEND_REGNUM (tdep))
|
||
regclass = mpx;
|
||
else if (regnum >= I387_XMM0_REGNUM (tdep)
|
||
&& regnum < I387_MXCSR_REGNUM (tdep))
|
||
regclass = sse;
|
||
else if (regnum >= I387_ST0_REGNUM (tdep)
|
||
&& regnum < I387_FCTRL_REGNUM (tdep))
|
||
regclass = x87;
|
||
else
|
||
regclass = none;
|
||
|
||
if (regclass != none)
|
||
{
|
||
/* Get `xstat_bv'. */
|
||
const gdb_byte *xstate_bv_p = XSAVE_XSTATE_BV_ADDR (regs);
|
||
|
||
/* The supported bits in `xstat_bv' are 1 byte. Clear part in
|
||
vector registers if its bit in xstat_bv is zero. */
|
||
clear_bv = (~(*xstate_bv_p)) & tdep->xcr0;
|
||
}
|
||
else
|
||
clear_bv = X86_XSTATE_ALL_MASK;
|
||
|
||
/* With the delayed xsave mechanism, in between the program
|
||
starting, and the program accessing the vector registers for the
|
||
first time, the register's values are invalid. The kernel
|
||
initializes register states to zero when they are set the first
|
||
time in a program. This means that from the user-space programs'
|
||
perspective, it's the same as if the registers have always been
|
||
zero from the start of the program. Therefore, the debugger
|
||
should provide the same illusion to the user. */
|
||
|
||
switch (regclass)
|
||
{
|
||
case none:
|
||
break;
|
||
|
||
case avx512_zmm_h:
|
||
if ((clear_bv & (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM)))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_AVX512_ZMM_H_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case avx512_k:
|
||
if ((clear_bv & X86_XSTATE_K))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_AVX512_K_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case avx512_ymmh_avx512:
|
||
if ((clear_bv & X86_XSTATE_ZMM))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_YMM_AVX512_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case avx512_xmm_avx512:
|
||
if ((clear_bv & X86_XSTATE_ZMM))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_XMM_AVX512_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case avxh:
|
||
if ((clear_bv & X86_XSTATE_AVX))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_AVXH_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case mpx:
|
||
if ((clear_bv & X86_XSTATE_BNDREGS))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
XSAVE_MPX_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case sse:
|
||
if ((clear_bv & X86_XSTATE_SSE))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
FXSAVE_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case x87:
|
||
if ((clear_bv & X86_XSTATE_X87))
|
||
regcache_raw_supply (regcache, regnum, zero);
|
||
else
|
||
regcache_raw_supply (regcache, regnum,
|
||
FXSAVE_ADDR (tdep, regs, regnum));
|
||
return;
|
||
|
||
case all:
|
||
/* Handle the upper ZMM registers. */
|
||
if ((tdep->xcr0 & (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM)))
|
||
{
|
||
if ((clear_bv & (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM)))
|
||
{
|
||
for (i = I387_ZMM0H_REGNUM (tdep);
|
||
i < I387_ZMMENDH_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_ZMM0H_REGNUM (tdep);
|
||
i < I387_ZMMENDH_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_AVX512_ZMM_H_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle AVX512 OpMask registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_K))
|
||
{
|
||
if ((clear_bv & X86_XSTATE_K))
|
||
{
|
||
for (i = I387_K0_REGNUM (tdep);
|
||
i < I387_KEND_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_K0_REGNUM (tdep);
|
||
i < I387_KEND_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_AVX512_K_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle the YMM_AVX512 registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_ZMM))
|
||
{
|
||
if ((clear_bv & X86_XSTATE_ZMM))
|
||
{
|
||
for (i = I387_YMM16H_REGNUM (tdep);
|
||
i < I387_YMMH_AVX512_END_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
for (i = I387_XMM16_REGNUM (tdep);
|
||
i < I387_XMM_AVX512_END_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_YMM16H_REGNUM (tdep);
|
||
i < I387_YMMH_AVX512_END_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_YMM_AVX512_ADDR (tdep, regs, i));
|
||
for (i = I387_XMM16_REGNUM (tdep);
|
||
i < I387_XMM_AVX512_END_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_XMM_AVX512_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
/* Handle the upper YMM registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_AVX))
|
||
{
|
||
if ((clear_bv & X86_XSTATE_AVX))
|
||
{
|
||
for (i = I387_YMM0H_REGNUM (tdep);
|
||
i < I387_YMMENDH_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_YMM0H_REGNUM (tdep);
|
||
i < I387_YMMENDH_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_AVXH_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle the MPX registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_BNDREGS))
|
||
{
|
||
if (clear_bv & X86_XSTATE_BNDREGS)
|
||
{
|
||
for (i = I387_BND0R_REGNUM (tdep);
|
||
i < I387_BNDCFGU_REGNUM (tdep); i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_BND0R_REGNUM (tdep);
|
||
i < I387_BNDCFGU_REGNUM (tdep); i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_MPX_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle the MPX registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_BNDCFG))
|
||
{
|
||
if (clear_bv & X86_XSTATE_BNDCFG)
|
||
{
|
||
for (i = I387_BNDCFGU_REGNUM (tdep);
|
||
i < I387_MPXEND_REGNUM (tdep); i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_BNDCFGU_REGNUM (tdep);
|
||
i < I387_MPXEND_REGNUM (tdep); i++)
|
||
regcache_raw_supply (regcache, i,
|
||
XSAVE_MPX_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle the XMM registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_SSE))
|
||
{
|
||
if ((clear_bv & X86_XSTATE_SSE))
|
||
{
|
||
for (i = I387_XMM0_REGNUM (tdep);
|
||
i < I387_MXCSR_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_XMM0_REGNUM (tdep);
|
||
i < I387_MXCSR_REGNUM (tdep); i++)
|
||
regcache_raw_supply (regcache, i,
|
||
FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
|
||
/* Handle the x87 registers. */
|
||
if ((tdep->xcr0 & X86_XSTATE_X87))
|
||
{
|
||
if ((clear_bv & X86_XSTATE_X87))
|
||
{
|
||
for (i = I387_ST0_REGNUM (tdep);
|
||
i < I387_FCTRL_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, zero);
|
||
}
|
||
else
|
||
{
|
||
for (i = I387_ST0_REGNUM (tdep);
|
||
i < I387_FCTRL_REGNUM (tdep);
|
||
i++)
|
||
regcache_raw_supply (regcache, i, FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* Only handle x87 control registers. */
|
||
for (i = I387_FCTRL_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
/* Most of the FPU control registers occupy only 16 bits in
|
||
the xsave extended state. Give those a special treatment. */
|
||
if (i != I387_FIOFF_REGNUM (tdep)
|
||
&& i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte val[4];
|
||
|
||
memcpy (val, FXSAVE_ADDR (tdep, regs, i), 2);
|
||
val[2] = val[3] = 0;
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
val[1] &= ((1 << 3) - 1);
|
||
else if (i== I387_FTAG_REGNUM (tdep))
|
||
{
|
||
/* The fxsave area contains a simplified version of
|
||
the tag word. We have to look at the actual 80-bit
|
||
FP data to recreate the traditional i387 tag word. */
|
||
|
||
unsigned long ftag = 0;
|
||
int fpreg;
|
||
int top;
|
||
|
||
top = ((FXSAVE_ADDR (tdep, regs,
|
||
I387_FSTAT_REGNUM (tdep)))[1] >> 3);
|
||
top &= 0x7;
|
||
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
int tag;
|
||
|
||
if (val[0] & (1 << fpreg))
|
||
{
|
||
int thisreg = (fpreg + 8 - top) % 8
|
||
+ I387_ST0_REGNUM (tdep);
|
||
tag = i387_tag (FXSAVE_ADDR (tdep, regs, thisreg));
|
||
}
|
||
else
|
||
tag = 3; /* Empty */
|
||
|
||
ftag |= tag << (2 * fpreg);
|
||
}
|
||
val[0] = ftag & 0xff;
|
||
val[1] = (ftag >> 8) & 0xff;
|
||
}
|
||
regcache_raw_supply (regcache, i, val);
|
||
}
|
||
else
|
||
regcache_raw_supply (regcache, i, FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
|
||
if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
|
||
regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep),
|
||
FXSAVE_MXCSR_ADDR (regs));
|
||
}
|
||
|
||
/* Similar to i387_collect_fxsave, but use XSAVE extended state. */
|
||
|
||
void
|
||
i387_collect_xsave (const struct regcache *regcache, int regnum,
|
||
void *xsave, int gcore)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
gdb_byte *regs = xsave;
|
||
int i;
|
||
enum
|
||
{
|
||
none = 0x0,
|
||
check = 0x1,
|
||
x87 = 0x2 | check,
|
||
sse = 0x4 | check,
|
||
avxh = 0x8 | check,
|
||
mpx = 0x10 | check,
|
||
avx512_k = 0x20 | check,
|
||
avx512_zmm_h = 0x40 | check,
|
||
avx512_ymmh_avx512 = 0x80 | check,
|
||
avx512_xmm_avx512 = 0x100 | check,
|
||
all = x87 | sse | avxh | mpx | avx512_k | avx512_zmm_h
|
||
| avx512_ymmh_avx512 | avx512_xmm_avx512
|
||
} regclass;
|
||
|
||
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
|
||
gdb_assert (tdep->num_xmm_regs > 0);
|
||
|
||
if (regnum == -1)
|
||
regclass = all;
|
||
else if (regnum >= I387_ZMM0H_REGNUM (tdep)
|
||
&& regnum < I387_ZMMENDH_REGNUM (tdep))
|
||
regclass = avx512_zmm_h;
|
||
else if (regnum >= I387_K0_REGNUM (tdep)
|
||
&& regnum < I387_KEND_REGNUM (tdep))
|
||
regclass = avx512_k;
|
||
else if (regnum >= I387_YMM16H_REGNUM (tdep)
|
||
&& regnum < I387_YMMH_AVX512_END_REGNUM (tdep))
|
||
regclass = avx512_ymmh_avx512;
|
||
else if (regnum >= I387_XMM16_REGNUM (tdep)
|
||
&& regnum < I387_XMM_AVX512_END_REGNUM (tdep))
|
||
regclass = avx512_xmm_avx512;
|
||
else if (regnum >= I387_YMM0H_REGNUM (tdep)
|
||
&& regnum < I387_YMMENDH_REGNUM (tdep))
|
||
regclass = avxh;
|
||
else if (regnum >= I387_BND0R_REGNUM (tdep)
|
||
&& regnum < I387_MPXEND_REGNUM (tdep))
|
||
regclass = mpx;
|
||
else if (regnum >= I387_XMM0_REGNUM (tdep)
|
||
&& regnum < I387_MXCSR_REGNUM (tdep))
|
||
regclass = sse;
|
||
else if (regnum >= I387_ST0_REGNUM (tdep)
|
||
&& regnum < I387_FCTRL_REGNUM (tdep))
|
||
regclass = x87;
|
||
else
|
||
regclass = none;
|
||
|
||
if (gcore)
|
||
{
|
||
/* Clear XSAVE extended state. */
|
||
memset (regs, 0, X86_XSTATE_SIZE (tdep->xcr0));
|
||
|
||
/* Update XCR0 and `xstate_bv' with XCR0 for gcore. */
|
||
if (tdep->xsave_xcr0_offset != -1)
|
||
memcpy (regs + tdep->xsave_xcr0_offset, &tdep->xcr0, 8);
|
||
memcpy (XSAVE_XSTATE_BV_ADDR (regs), &tdep->xcr0, 8);
|
||
}
|
||
|
||
if ((regclass & check))
|
||
{
|
||
gdb_byte raw[I386_MAX_REGISTER_SIZE];
|
||
gdb_byte *xstate_bv_p = XSAVE_XSTATE_BV_ADDR (regs);
|
||
unsigned int xstate_bv = 0;
|
||
/* The supported bits in `xstat_bv' are 1 byte. */
|
||
unsigned int clear_bv = (~(*xstate_bv_p)) & tdep->xcr0;
|
||
gdb_byte *p;
|
||
|
||
/* Clear register set if its bit in xstat_bv is zero. */
|
||
if (clear_bv)
|
||
{
|
||
if ((clear_bv & X86_XSTATE_BNDREGS))
|
||
for (i = I387_BND0R_REGNUM (tdep);
|
||
i < I387_BNDCFGU_REGNUM (tdep); i++)
|
||
memset (XSAVE_MPX_ADDR (tdep, regs, i), 0, 16);
|
||
|
||
if ((clear_bv & X86_XSTATE_BNDCFG))
|
||
for (i = I387_BNDCFGU_REGNUM (tdep);
|
||
i < I387_MPXEND_REGNUM (tdep); i++)
|
||
memset (XSAVE_MPX_ADDR (tdep, regs, i), 0, 8);
|
||
|
||
if ((clear_bv & (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM)))
|
||
for (i = I387_ZMM0H_REGNUM (tdep);
|
||
i < I387_ZMMENDH_REGNUM (tdep); i++)
|
||
memset (XSAVE_AVX512_ZMM_H_ADDR (tdep, regs, i), 0, 32);
|
||
|
||
if ((clear_bv & X86_XSTATE_K))
|
||
for (i = I387_K0_REGNUM (tdep);
|
||
i < I387_KEND_REGNUM (tdep); i++)
|
||
memset (XSAVE_AVX512_K_ADDR (tdep, regs, i), 0, 8);
|
||
|
||
if ((clear_bv & X86_XSTATE_ZMM))
|
||
{
|
||
for (i = I387_YMM16H_REGNUM (tdep);
|
||
i < I387_YMMH_AVX512_END_REGNUM (tdep); i++)
|
||
memset (XSAVE_YMM_AVX512_ADDR (tdep, regs, i), 0, 16);
|
||
for (i = I387_XMM16_REGNUM (tdep);
|
||
i < I387_XMM_AVX512_END_REGNUM (tdep); i++)
|
||
memset (XSAVE_XMM_AVX512_ADDR (tdep, regs, i), 0, 16);
|
||
}
|
||
|
||
if ((clear_bv & X86_XSTATE_AVX))
|
||
for (i = I387_YMM0H_REGNUM (tdep);
|
||
i < I387_YMMENDH_REGNUM (tdep); i++)
|
||
memset (XSAVE_AVXH_ADDR (tdep, regs, i), 0, 16);
|
||
|
||
if ((clear_bv & X86_XSTATE_SSE))
|
||
for (i = I387_XMM0_REGNUM (tdep);
|
||
i < I387_MXCSR_REGNUM (tdep); i++)
|
||
memset (FXSAVE_ADDR (tdep, regs, i), 0, 16);
|
||
|
||
if ((clear_bv & X86_XSTATE_X87))
|
||
for (i = I387_ST0_REGNUM (tdep);
|
||
i < I387_FCTRL_REGNUM (tdep); i++)
|
||
memset (FXSAVE_ADDR (tdep, regs, i), 0, 10);
|
||
}
|
||
|
||
if (regclass == all)
|
||
{
|
||
/* Check if any ZMMH registers are changed. */
|
||
if ((tdep->xcr0 & (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM)))
|
||
for (i = I387_ZMM0H_REGNUM (tdep);
|
||
i < I387_ZMMENDH_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_AVX512_ZMM_H_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 32) != 0)
|
||
{
|
||
xstate_bv |= (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM);
|
||
memcpy (p, raw, 32);
|
||
}
|
||
}
|
||
|
||
/* Check if any K registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_K))
|
||
for (i = I387_K0_REGNUM (tdep);
|
||
i < I387_KEND_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_AVX512_K_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 8) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_K;
|
||
memcpy (p, raw, 8);
|
||
}
|
||
}
|
||
|
||
/* Check if any XMM or upper YMM registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_ZMM))
|
||
{
|
||
for (i = I387_YMM16H_REGNUM (tdep);
|
||
i < I387_YMMH_AVX512_END_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_YMM_AVX512_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 16) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_ZMM;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
for (i = I387_XMM16_REGNUM (tdep);
|
||
i < I387_XMM_AVX512_END_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_XMM_AVX512_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 16) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_ZMM;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Check if any upper YMM registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_AVX))
|
||
for (i = I387_YMM0H_REGNUM (tdep);
|
||
i < I387_YMMENDH_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_AVXH_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_AVX;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
/* Check if any upper MPX registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_BNDREGS))
|
||
for (i = I387_BND0R_REGNUM (tdep);
|
||
i < I387_BNDCFGU_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_MPX_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_BNDREGS;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
|
||
/* Check if any upper MPX registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_BNDCFG))
|
||
for (i = I387_BNDCFGU_REGNUM (tdep);
|
||
i < I387_MPXEND_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = XSAVE_MPX_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 8))
|
||
{
|
||
xstate_bv |= X86_XSTATE_BNDCFG;
|
||
memcpy (p, raw, 8);
|
||
}
|
||
}
|
||
|
||
/* Check if any SSE registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_SSE))
|
||
for (i = I387_XMM0_REGNUM (tdep);
|
||
i < I387_MXCSR_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = FXSAVE_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_SSE;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
|
||
/* Check if any X87 registers are changed. */
|
||
if ((tdep->xcr0 & X86_XSTATE_X87))
|
||
for (i = I387_ST0_REGNUM (tdep);
|
||
i < I387_FCTRL_REGNUM (tdep); i++)
|
||
{
|
||
regcache_raw_collect (regcache, i, raw);
|
||
p = FXSAVE_ADDR (tdep, regs, i);
|
||
if (memcmp (raw, p, 10))
|
||
{
|
||
xstate_bv |= X86_XSTATE_X87;
|
||
memcpy (p, raw, 10);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Check if REGNUM is changed. */
|
||
regcache_raw_collect (regcache, regnum, raw);
|
||
|
||
switch (regclass)
|
||
{
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
_("invalid i387 regclass"));
|
||
|
||
case avx512_zmm_h:
|
||
/* This is a ZMM register. */
|
||
p = XSAVE_AVX512_ZMM_H_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 32) != 0)
|
||
{
|
||
xstate_bv |= (X86_XSTATE_ZMM_H | X86_XSTATE_ZMM);
|
||
memcpy (p, raw, 32);
|
||
}
|
||
break;
|
||
case avx512_k:
|
||
/* This is a AVX512 mask register. */
|
||
p = XSAVE_AVX512_K_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 8) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_K;
|
||
memcpy (p, raw, 8);
|
||
}
|
||
break;
|
||
|
||
case avx512_ymmh_avx512:
|
||
/* This is an upper YMM16-31 register. */
|
||
p = XSAVE_YMM_AVX512_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 16) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_ZMM;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
break;
|
||
|
||
case avx512_xmm_avx512:
|
||
/* This is an upper XMM16-31 register. */
|
||
p = XSAVE_XMM_AVX512_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 16) != 0)
|
||
{
|
||
xstate_bv |= X86_XSTATE_ZMM;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
break;
|
||
|
||
case avxh:
|
||
/* This is an upper YMM register. */
|
||
p = XSAVE_AVXH_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_AVX;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
break;
|
||
|
||
case mpx:
|
||
if (regnum < I387_BNDCFGU_REGNUM (tdep))
|
||
{
|
||
regcache_raw_collect (regcache, regnum, raw);
|
||
p = XSAVE_MPX_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_BNDREGS;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
p = XSAVE_MPX_ADDR (tdep, regs, regnum);
|
||
xstate_bv |= X86_XSTATE_BNDCFG;
|
||
memcpy (p, raw, 8);
|
||
}
|
||
break;
|
||
|
||
case sse:
|
||
/* This is an SSE register. */
|
||
p = FXSAVE_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 16))
|
||
{
|
||
xstate_bv |= X86_XSTATE_SSE;
|
||
memcpy (p, raw, 16);
|
||
}
|
||
break;
|
||
|
||
case x87:
|
||
/* This is an x87 register. */
|
||
p = FXSAVE_ADDR (tdep, regs, regnum);
|
||
if (memcmp (raw, p, 10))
|
||
{
|
||
xstate_bv |= X86_XSTATE_X87;
|
||
memcpy (p, raw, 10);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Update the corresponding bits in `xstate_bv' if any SSE/AVX
|
||
registers are changed. */
|
||
if (xstate_bv)
|
||
{
|
||
/* The supported bits in `xstat_bv' are 1 byte. */
|
||
*xstate_bv_p |= (gdb_byte) xstate_bv;
|
||
|
||
switch (regclass)
|
||
{
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
_("invalid i387 regclass"));
|
||
|
||
case all:
|
||
break;
|
||
|
||
case x87:
|
||
case sse:
|
||
case avxh:
|
||
case mpx:
|
||
case avx512_k:
|
||
case avx512_zmm_h:
|
||
case avx512_ymmh_avx512:
|
||
case avx512_xmm_avx512:
|
||
/* Register REGNUM has been updated. Return. */
|
||
return;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Return if REGNUM isn't changed. */
|
||
if (regclass != all)
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Only handle x87 control registers. */
|
||
for (i = I387_FCTRL_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
/* Most of the FPU control registers occupy only 16 bits in
|
||
the xsave extended state. Give those a special treatment. */
|
||
if (i != I387_FIOFF_REGNUM (tdep)
|
||
&& i != I387_FOOFF_REGNUM (tdep))
|
||
{
|
||
gdb_byte buf[4];
|
||
|
||
regcache_raw_collect (regcache, i, buf);
|
||
|
||
if (i == I387_FOP_REGNUM (tdep))
|
||
{
|
||
/* The opcode occupies only 11 bits. Make sure we
|
||
don't touch the other bits. */
|
||
buf[1] &= ((1 << 3) - 1);
|
||
buf[1] |= ((FXSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1));
|
||
}
|
||
else if (i == I387_FTAG_REGNUM (tdep))
|
||
{
|
||
/* Converting back is much easier. */
|
||
|
||
unsigned short ftag;
|
||
int fpreg;
|
||
|
||
ftag = (buf[1] << 8) | buf[0];
|
||
buf[0] = 0;
|
||
buf[1] = 0;
|
||
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
int tag = (ftag >> (fpreg * 2)) & 3;
|
||
|
||
if (tag != 3)
|
||
buf[0] |= (1 << fpreg);
|
||
}
|
||
}
|
||
memcpy (FXSAVE_ADDR (tdep, regs, i), buf, 2);
|
||
}
|
||
else
|
||
regcache_raw_collect (regcache, i, FXSAVE_ADDR (tdep, regs, i));
|
||
}
|
||
|
||
if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
|
||
regcache_raw_collect (regcache, I387_MXCSR_REGNUM (tdep),
|
||
FXSAVE_MXCSR_ADDR (regs));
|
||
}
|
||
|
||
/* Recreate the FTW (tag word) valid bits from the 80-bit FP data in
|
||
*RAW. */
|
||
|
||
static int
|
||
i387_tag (const gdb_byte *raw)
|
||
{
|
||
int integer;
|
||
unsigned int exponent;
|
||
unsigned long fraction[2];
|
||
|
||
integer = raw[7] & 0x80;
|
||
exponent = (((raw[9] & 0x7f) << 8) | raw[8]);
|
||
fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]);
|
||
fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16)
|
||
| (raw[5] << 8) | raw[4]);
|
||
|
||
if (exponent == 0x7fff)
|
||
{
|
||
/* Special. */
|
||
return (2);
|
||
}
|
||
else if (exponent == 0x0000)
|
||
{
|
||
if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer)
|
||
{
|
||
/* Zero. */
|
||
return (1);
|
||
}
|
||
else
|
||
{
|
||
/* Special. */
|
||
return (2);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (integer)
|
||
{
|
||
/* Valid. */
|
||
return (0);
|
||
}
|
||
else
|
||
{
|
||
/* Special. */
|
||
return (2);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Prepare the FPU stack in REGCACHE for a function return. */
|
||
|
||
void
|
||
i387_return_value (struct gdbarch *gdbarch, struct regcache *regcache)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
ULONGEST fstat;
|
||
|
||
/* Set the top of the floating-point register stack to 7. The
|
||
actual value doesn't really matter, but 7 is what a normal
|
||
function return would end up with if the program started out with
|
||
a freshly initialized FPU. */
|
||
regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM (tdep), &fstat);
|
||
fstat |= (7 << 11);
|
||
regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM (tdep), fstat);
|
||
|
||
/* Mark %st(1) through %st(7) as empty. Since we set the top of the
|
||
floating-point register stack to 7, the appropriate value for the
|
||
tag word is 0x3fff. */
|
||
regcache_raw_write_unsigned (regcache, I387_FTAG_REGNUM (tdep), 0x3fff);
|
||
|
||
}
|