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f2524b93f3
* alpha-tdep.c (alpha_sigtramp_frame_sniffer): Use pc_in_sigtramp. * alpha-tdep.h (struct gdbarch_tdep): Add pc_in_sigtramp. * alphafbsd-tdep.c (alphafbsd_init_abi): Update. * alpha-osf1-tdep.c (alpha_osf1_init_abi): Update. * alpha-linux-tdep.c (alpha_linux_init_abi): Update.
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* Target-dependent code for GNU/Linux on Alpha.
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Copyright 2002, 2003 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "gdb_assert.h"
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#include "osabi.h"
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#include "alpha-tdep.h"
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/* Under GNU/Linux, signal handler invocations can be identified by
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the designated code sequence that is used to return from a signal
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handler. In particular, the return address of a signal handler
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points to a sequence that copies $sp to $16, loads $0 with the
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appropriate syscall number, and finally enters the kernel.
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This is somewhat complicated in that:
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(1) the expansion of the "mov" assembler macro has changed over
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time, from "bis src,src,dst" to "bis zero,src,dst",
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(2) the kernel has changed from using "addq" to "lda" to load the
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syscall number,
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(3) there is a "normal" sigreturn and an "rt" sigreturn which
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has a different stack layout.
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*/
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static long
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alpha_linux_sigtramp_offset_1 (CORE_ADDR pc)
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{
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switch (alpha_read_insn (pc))
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{
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case 0x47de0410: /* bis $30,$30,$16 */
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case 0x47fe0410: /* bis $31,$30,$16 */
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return 0;
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case 0x43ecf400: /* addq $31,103,$0 */
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case 0x201f0067: /* lda $0,103($31) */
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case 0x201f015f: /* lda $0,351($31) */
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return 4;
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case 0x00000083: /* call_pal callsys */
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return 8;
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default:
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return -1;
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}
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}
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static LONGEST
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alpha_linux_sigtramp_offset (CORE_ADDR pc)
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{
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long i, off;
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if (pc & 3)
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return -1;
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/* Guess where we might be in the sequence. */
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off = alpha_linux_sigtramp_offset_1 (pc);
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if (off < 0)
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return -1;
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/* Verify that the other two insns of the sequence are as we expect. */
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pc -= off;
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for (i = 0; i < 12; i += 4)
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{
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if (i == off)
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continue;
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if (alpha_linux_sigtramp_offset_1 (pc + i) != i)
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return -1;
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}
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return off;
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}
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static int
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alpha_linux_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
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{
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return alpha_linux_sigtramp_offset (pc) >= 0;
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}
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static CORE_ADDR
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alpha_linux_sigcontext_addr (struct frame_info *next_frame)
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{
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CORE_ADDR pc;
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ULONGEST sp;
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long off;
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pc = frame_pc_unwind (next_frame);
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frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &sp);
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off = alpha_linux_sigtramp_offset (pc);
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gdb_assert (off >= 0);
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/* __NR_rt_sigreturn has a couple of structures on the stack. This is:
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struct rt_sigframe {
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struct siginfo info;
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struct ucontext uc;
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};
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offsetof (struct rt_sigframe, uc.uc_mcontext);
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*/
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if (alpha_read_insn (pc - off + 4) == 0x201f015f)
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return sp + 176;
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/* __NR_sigreturn has the sigcontext structure at the top of the stack. */
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return sp;
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}
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static void
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alpha_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep;
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/* Hook into the DWARF CFI frame unwinder. */
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alpha_dwarf2_init_abi (info, gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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tdep = gdbarch_tdep (gdbarch);
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tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
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tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
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tdep->pc_in_sigtramp = alpha_linux_pc_in_sigtramp;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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}
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void
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_initialize_alpha_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_LINUX,
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alpha_linux_init_abi);
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}
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