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https://github.com/darlinghq/darling-gdb.git
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0b1afbb37b
While writing the previous patch, I noticed that we're not consistent with the (C) in the copyright header. The maintainers manual prefers having it, though also says it's optional. We have over 10x more files with (C) than without in gdb's code, so I spent a few minutes grepping and fixing. Funny enough, the testsuite has it backwards. I'll leave that for another time. gdb/ 2013-02-12 Pedro Alves <palves@redhat.com> * amd64-darwin-tdep.c: Add (C) after Copyright. * cli/cli-cmds.h: Ditto. * cli/cli-decode.c: Ditto. * cli/cli-decode.h: Ditto. * cli/cli-dump.c: Ditto. * cli/cli-dump.h: Ditto. * cli/cli-interp.c: Ditto. * cli/cli-logging.c: Ditto. * cli/cli-script.c: Ditto. * cli/cli-script.h: Ditto. * cli/cli-setshow.c: Ditto. * cli/cli-setshow.h: Ditto. * cli/cli-utils.c: Ditto. * cli/cli-utils.h: Ditto. * config/alpha/nm-osf3.h: Ditto. * config/djgpp/djconfig.sh: Ditto. * config/i386/nm-fbsd.h: Ditto. * config/i386/nm-i386gnu.h: Ditto. * config/nm-linux.h: Ditto. * config/nm-nto.h: Ditto. * config/rs6000/nm-rs6000.h: Ditto. * config/sparc/nm-sol2.h: Ditto. * darwin-nat-info.c: Ditto. * dfp.c: Ditto. * dfp.h: Ditto. * gdb-demangle.h: Ditto. * i386-darwin-nat.c: Ditto. * i386-darwin-tdep.c: Ditto. * linux-fork.h: Ditto. * m32c-tdep.c: Ditto. * microblaze-linux-tdep.c: Ditto. * microblaze-rom.c: Ditto. * microblaze-tdep.c: Ditto. * microblaze-tdep.h: Ditto. * mips-linux-tdep.h: Ditto. * ppc-ravenscar-thread.c: Ditto. * ppc-ravenscar-thread.h: Ditto. * prologue-value.c: Ditto. * prologue-value.h: Ditto. * ravenscar-thread.c: Ditto. * ravenscar-thread.h: Ditto. * sparc-ravenscar-thread.c: Ditto. * sparc-ravenscar-thread.h: Ditto. * tilegx-linux-tdep.c: Ditto. * unwind_stop_reasons.def: Ditto. * windows-nat.h: Ditto. * xtensa-linux-tdep.c: Ditto. * xtensa-xtregs.c: Ditto. * regformats/regdat.sh: Ditto. * regformats/regdef.h: Ditto. gdb/gdbserver/ 2013-02-12 Pedro Alves <palves@redhat.com> * linux-xtensa-low.c: Ditto. * xtensa-xtregs.c: Ditto.
301 lines
9.3 KiB
C
301 lines
9.3 KiB
C
/* Darwin support for GDB, the GNU debugger.
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Copyright (C) 1997-2013 Free Software Foundation, Inc.
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Contributed by Apple Computer, 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 "frame.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "floatformat.h"
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#include "symtab.h"
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#include "regcache.h"
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#include "libbfd.h"
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#include "objfiles.h"
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#include "i387-tdep.h"
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#include "i386-tdep.h"
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#include "osabi.h"
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#include "ui-out.h"
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#include "symtab.h"
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#include "frame.h"
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#include "gdb_assert.h"
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#include "i386-darwin-tdep.h"
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#include "solib.h"
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#include "solib-darwin.h"
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#include "dwarf2-frame.h"
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/* Offsets into the struct i386_thread_state where we'll find the saved regs.
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From <mach/i386/thread_status.h> and i386-tdep.h. */
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int i386_darwin_thread_state_reg_offset[] =
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{
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0 * 4, /* EAX */
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2 * 4, /* ECX */
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3 * 4, /* EDX */
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1 * 4, /* EBX */
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7 * 4, /* ESP */
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6 * 4, /* EBP */
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5 * 4, /* ESI */
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4 * 4, /* EDI */
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10 * 4, /* EIP */
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9 * 4, /* EFLAGS */
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11 * 4, /* CS */
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8 * 4, /* SS */
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12 * 4, /* DS */
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13 * 4, /* ES */
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14 * 4, /* FS */
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15 * 4 /* GS */
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};
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const int i386_darwin_thread_state_num_regs =
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ARRAY_SIZE (i386_darwin_thread_state_reg_offset);
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/* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
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address of the associated sigcontext structure. */
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static CORE_ADDR
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i386_darwin_sigcontext_addr (struct frame_info *this_frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR bp;
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CORE_ADDR si;
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gdb_byte buf[4];
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get_frame_register (this_frame, I386_EBP_REGNUM, buf);
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bp = extract_unsigned_integer (buf, 4, byte_order);
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/* A pointer to the ucontext is passed as the fourth argument
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to the signal handler. */
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read_memory (bp + 24, buf, 4);
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si = extract_unsigned_integer (buf, 4, byte_order);
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/* The pointer to mcontext is at offset 28. */
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read_memory (si + 28, buf, 4);
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/* First register (eax) is at offset 12. */
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return extract_unsigned_integer (buf, 4, byte_order) + 12;
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}
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/* Return true if the PC of THIS_FRAME is in a signal trampoline which
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may have DWARF-2 CFI.
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On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE
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that covers only the indirect call to the user handler.
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Without this function, the frame is recognized as a normal frame which is
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not expected. */
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int
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darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch,
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struct frame_info *this_frame)
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{
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return i386_sigtramp_p (this_frame);
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}
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/* Check wether TYPE is a 128-bit vector (__m128, __m128d or __m128i). */
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static int
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i386_m128_p (struct type *type)
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{
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return (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
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&& TYPE_LENGTH (type) == 16);
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}
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/* Return the alignment for TYPE when passed as an argument. */
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static int
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i386_darwin_arg_type_alignment (struct type *type)
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{
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type = check_typedef (type);
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/* According to Mac OS X ABI document (passing arguments):
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6. The caller places 64-bit vectors (__m64) on the parameter area,
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aligned to 8-byte boundaries.
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7. [...] The caller aligns 128-bit vectors in the parameter area to
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16-byte boundaries. */
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if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
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return TYPE_LENGTH (type);
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/* 4. The caller places all the fields of structures (or unions) with no
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vector elements in the parameter area. These structures are 4-byte
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aligned.
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5. The caller places structures with vector elements on the stack,
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16-byte aligned. */
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if (TYPE_CODE (type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type) == TYPE_CODE_UNION)
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{
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int i;
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int res = 4;
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for (i = 0; i < TYPE_NFIELDS (type); i++)
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res = max (res,
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i386_darwin_arg_type_alignment (TYPE_FIELD_TYPE (type, i)));
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return res;
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}
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/* 2. The caller aligns nonvector arguments to 4-byte boundaries. */
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return 4;
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}
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static CORE_ADDR
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i386_darwin_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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struct regcache *regcache, CORE_ADDR bp_addr,
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int nargs, struct value **args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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gdb_byte buf[4];
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int i;
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int write_pass;
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/* Determine the total space required for arguments and struct
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return address in a first pass, then push arguments in a second pass. */
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for (write_pass = 0; write_pass < 2; write_pass++)
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{
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int args_space = 0;
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int num_m128 = 0;
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if (struct_return)
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{
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if (write_pass)
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{
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/* Push value address. */
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store_unsigned_integer (buf, 4, byte_order, struct_addr);
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write_memory (sp, buf, 4);
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}
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args_space += 4;
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}
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for (i = 0; i < nargs; i++)
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{
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struct type *arg_type = value_enclosing_type (args[i]);
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if (i386_m128_p (arg_type) && num_m128 < 4)
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{
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if (write_pass)
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{
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const gdb_byte *val = value_contents_all (args[i]);
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regcache_raw_write
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(regcache, I387_MM0_REGNUM(tdep) + num_m128, val);
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}
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num_m128++;
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}
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else
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{
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args_space = align_up (args_space,
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i386_darwin_arg_type_alignment (arg_type));
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if (write_pass)
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write_memory (sp + args_space,
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value_contents_all (args[i]),
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TYPE_LENGTH (arg_type));
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/* The System V ABI says that:
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"An argument's size is increased, if necessary, to make it a
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multiple of [32-bit] words. This may require tail padding,
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depending on the size of the argument."
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This makes sure the stack stays word-aligned. */
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args_space += align_up (TYPE_LENGTH (arg_type), 4);
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}
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}
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/* Darwin i386 ABI:
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1. The caller ensures that the stack is 16-byte aligned at the point
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of the function call. */
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if (!write_pass)
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sp = align_down (sp - args_space, 16);
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}
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/* Store return address. */
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sp -= 4;
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store_unsigned_integer (buf, 4, byte_order, bp_addr);
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write_memory (sp, buf, 4);
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/* Finally, update the stack pointer... */
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store_unsigned_integer (buf, 4, byte_order, sp);
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regcache_cooked_write (regcache, I386_ESP_REGNUM, buf);
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/* ...and fake a frame pointer. */
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regcache_cooked_write (regcache, I386_EBP_REGNUM, buf);
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/* MarkK wrote: This "+ 8" is all over the place:
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(i386_frame_this_id, i386_sigtramp_frame_this_id,
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i386_dummy_id). It's there, since all frame unwinders for
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a given target have to agree (within a certain margin) on the
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definition of the stack address of a frame. Otherwise frame id
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comparison might not work correctly. Since DWARF2/GCC uses the
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stack address *before* the function call as a frame's CFA. On
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the i386, when %ebp is used as a frame pointer, the offset
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between the contents %ebp and the CFA as defined by GCC. */
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return sp + 8;
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}
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static void
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i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* We support the SSE registers. */
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tdep->num_xmm_regs = I386_NUM_XREGS - 1;
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set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
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dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
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set_gdbarch_push_dummy_call (gdbarch, i386_darwin_push_dummy_call);
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tdep->struct_return = reg_struct_return;
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tdep->sigtramp_p = i386_sigtramp_p;
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tdep->sigcontext_addr = i386_darwin_sigcontext_addr;
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tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset;
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tdep->sc_num_regs = i386_darwin_thread_state_num_regs;
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tdep->jb_pc_offset = 48;
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/* Although the i387 extended floating-point has only 80 significant
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bits, a `long double' actually takes up 128, probably to enforce
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alignment. */
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set_gdbarch_long_double_bit (gdbarch, 128);
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set_solib_ops (gdbarch, &darwin_so_ops);
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}
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static enum gdb_osabi
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i386_mach_o_osabi_sniffer (bfd *abfd)
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{
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if (!bfd_check_format (abfd, bfd_object))
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return GDB_OSABI_UNKNOWN;
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if (bfd_get_arch (abfd) == bfd_arch_i386)
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return GDB_OSABI_DARWIN;
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return GDB_OSABI_UNKNOWN;
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}
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/* -Wmissing-prototypes */
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extern initialize_file_ftype _initialize_i386_darwin_tdep;
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void
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_initialize_i386_darwin_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour,
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i386_mach_o_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_i386_i386,
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GDB_OSABI_DARWIN, i386_darwin_init_abi);
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}
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