585 lines
16 KiB
C
585 lines
16 KiB
C
/* Darwin support for GDB, the GNU debugger.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2008, 2009, 2010, 2011
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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 "target.h"
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#include "symfile.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "gdbarch.h"
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#include "arch-utils.h"
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#include "gdbcore.h"
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#include "darwin-nat.h"
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#include "i386-darwin-tdep.h"
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#ifdef BFD64
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#include "amd64-nat.h"
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#include "amd64-tdep.h"
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#include "amd64-darwin-tdep.h"
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#endif
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/* Read register values from the inferior process.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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i386_darwin_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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thread_t current_thread = ptid_get_tid (inferior_ptid);
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int fetched = 0;
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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#ifdef BFD64
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if (gdbarch_ptr_bit (gdbarch) == 64)
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{
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if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
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{
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x86_thread_state_t gp_regs;
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unsigned int gp_count = x86_THREAD_STATE_COUNT;
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kern_return_t ret;
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ret = thread_get_state
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(current_thread, x86_THREAD_STATE, (thread_state_t) & gp_regs,
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&gp_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error calling thread_get_state for GP registers for thread 0x%ulx"), current_thread);
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MACH_CHECK_ERROR (ret);
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}
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amd64_supply_native_gregset (regcache, &gp_regs.uts, -1);
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fetched++;
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}
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if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
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{
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x86_float_state_t fp_regs;
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unsigned int fp_count = x86_FLOAT_STATE_COUNT;
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kern_return_t ret;
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ret = thread_get_state
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(current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
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&fp_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error calling thread_get_state for float registers for thread 0x%ulx"), current_thread);
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MACH_CHECK_ERROR (ret);
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}
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amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw);
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fetched++;
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}
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}
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else
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#endif
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{
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if (regno == -1 || regno < I386_NUM_GREGS)
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{
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i386_thread_state_t gp_regs;
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unsigned int gp_count = i386_THREAD_STATE_COUNT;
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kern_return_t ret;
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int i;
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ret = thread_get_state
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(current_thread, i386_THREAD_STATE, (thread_state_t) & gp_regs,
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&gp_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error calling thread_get_state for GP registers for thread 0x%ulx"), current_thread);
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MACH_CHECK_ERROR (ret);
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}
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for (i = 0; i < I386_NUM_GREGS; i++)
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regcache_raw_supply
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(regcache, i,
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(char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
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fetched++;
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}
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if (regno == -1
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|| (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
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{
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i386_float_state_t fp_regs;
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unsigned int fp_count = i386_FLOAT_STATE_COUNT;
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kern_return_t ret;
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ret = thread_get_state
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(current_thread, i386_FLOAT_STATE, (thread_state_t) & fp_regs,
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&fp_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error calling thread_get_state for float registers for thread 0x%ulx"), current_thread);
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MACH_CHECK_ERROR (ret);
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}
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i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw);
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fetched++;
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}
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}
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if (! fetched)
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{
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warning (_("unknown register %d"), regno);
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regcache_raw_supply (regcache, regno, NULL);
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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i386_darwin_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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thread_t current_thread = ptid_get_tid (inferior_ptid);
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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#ifdef BFD64
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if (gdbarch_ptr_bit (gdbarch) == 64)
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{
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if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
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{
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x86_thread_state_t gp_regs;
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kern_return_t ret;
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unsigned int gp_count = x86_THREAD_STATE_COUNT;
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ret = thread_get_state
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(current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs,
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&gp_count);
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MACH_CHECK_ERROR (ret);
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gdb_assert (gp_regs.tsh.flavor == x86_THREAD_STATE64);
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gdb_assert (gp_regs.tsh.count == x86_THREAD_STATE64_COUNT);
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amd64_collect_native_gregset (regcache, &gp_regs.uts, regno);
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ret = thread_set_state (current_thread, x86_THREAD_STATE,
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(thread_state_t) &gp_regs,
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x86_THREAD_STATE_COUNT);
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MACH_CHECK_ERROR (ret);
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}
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if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
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{
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x86_float_state_t fp_regs;
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kern_return_t ret;
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unsigned int fp_count = x86_FLOAT_STATE_COUNT;
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ret = thread_get_state
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(current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
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&fp_count);
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MACH_CHECK_ERROR (ret);
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gdb_assert (fp_regs.fsh.flavor == x86_FLOAT_STATE64);
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gdb_assert (fp_regs.fsh.count == x86_FLOAT_STATE64_COUNT);
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amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw);
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ret = thread_set_state (current_thread, x86_FLOAT_STATE,
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(thread_state_t) & fp_regs,
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x86_FLOAT_STATE_COUNT);
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MACH_CHECK_ERROR (ret);
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}
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}
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else
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#endif
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{
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if (regno == -1 || regno < I386_NUM_GREGS)
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{
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i386_thread_state_t gp_regs;
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kern_return_t ret;
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unsigned int gp_count = i386_THREAD_STATE_COUNT;
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int i;
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ret = thread_get_state
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(current_thread, i386_THREAD_STATE, (thread_state_t) & gp_regs,
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&gp_count);
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MACH_CHECK_ERROR (ret);
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for (i = 0; i < I386_NUM_GREGS; i++)
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if (regno == -1 || regno == i)
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regcache_raw_collect
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(regcache, i,
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(char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
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ret = thread_set_state (current_thread, i386_THREAD_STATE,
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(thread_state_t) & gp_regs,
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i386_THREAD_STATE_COUNT);
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MACH_CHECK_ERROR (ret);
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}
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if (regno == -1
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|| (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
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{
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i386_float_state_t fp_regs;
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unsigned int fp_count = i386_FLOAT_STATE_COUNT;
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kern_return_t ret;
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ret = thread_get_state
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(current_thread, i386_FLOAT_STATE, (thread_state_t) & fp_regs,
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&fp_count);
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MACH_CHECK_ERROR (ret);
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i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw);
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ret = thread_set_state (current_thread, i386_FLOAT_STATE,
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(thread_state_t) & fp_regs,
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i386_FLOAT_STATE_COUNT);
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MACH_CHECK_ERROR (ret);
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}
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}
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}
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/* Support for debug registers, boosted mostly from i386-linux-nat.c. */
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#ifndef DR_FIRSTADDR
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#define DR_FIRSTADDR 0
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#endif
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#ifndef DR_LASTADDR
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#define DR_LASTADDR 3
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#endif
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#ifndef DR_STATUS
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#define DR_STATUS 6
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#endif
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#ifndef DR_CONTROL
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#define DR_CONTROL 7
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#endif
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static void
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i386_darwin_dr_set (int regnum, uint32_t value)
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{
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int current_pid;
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thread_t current_thread;
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x86_debug_state_t dr_regs;
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kern_return_t ret;
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unsigned int dr_count = x86_DEBUG_STATE_COUNT;
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gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
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current_thread = ptid_get_tid (inferior_ptid);
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dr_regs.dsh.flavor = x86_DEBUG_STATE32;
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dr_regs.dsh.count = x86_DEBUG_STATE32_COUNT;
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dr_count = x86_DEBUG_STATE_COUNT;
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ret = thread_get_state (current_thread, x86_DEBUG_STATE,
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(thread_state_t) &dr_regs, &dr_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error reading debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
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MACH_CHECK_ERROR (ret);
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}
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switch (regnum)
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{
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case 0:
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dr_regs.uds.ds32.__dr0 = value;
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break;
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case 1:
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dr_regs.uds.ds32.__dr1 = value;
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break;
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case 2:
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dr_regs.uds.ds32.__dr2 = value;
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break;
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case 3:
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dr_regs.uds.ds32.__dr3 = value;
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break;
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case 4:
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dr_regs.uds.ds32.__dr4 = value;
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break;
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case 5:
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dr_regs.uds.ds32.__dr5 = value;
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break;
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case 6:
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dr_regs.uds.ds32.__dr6 = value;
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break;
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case 7:
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dr_regs.uds.ds32.__dr7 = value;
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break;
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}
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ret = thread_set_state (current_thread, x86_DEBUG_STATE,
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(thread_state_t) &dr_regs, dr_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error writing debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
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MACH_CHECK_ERROR (ret);
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}
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}
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static uint32_t
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i386_darwin_dr_get (int regnum)
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{
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thread_t current_thread;
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x86_debug_state_t dr_regs;
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kern_return_t ret;
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unsigned int dr_count = x86_DEBUG_STATE_COUNT;
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gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
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current_thread = ptid_get_tid (inferior_ptid);
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dr_regs.dsh.flavor = x86_DEBUG_STATE32;
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dr_regs.dsh.count = x86_DEBUG_STATE32_COUNT;
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dr_count = x86_DEBUG_STATE_COUNT;
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ret = thread_get_state (current_thread, x86_DEBUG_STATE,
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(thread_state_t) &dr_regs, &dr_count);
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if (ret != KERN_SUCCESS)
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{
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printf_unfiltered (_("Error reading debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
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MACH_CHECK_ERROR (ret);
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}
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switch (regnum)
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{
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case 0:
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return dr_regs.uds.ds32.__dr0;
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case 1:
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return dr_regs.uds.ds32.__dr1;
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case 2:
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return dr_regs.uds.ds32.__dr2;
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case 3:
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return dr_regs.uds.ds32.__dr3;
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case 4:
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return dr_regs.uds.ds32.__dr4;
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case 5:
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return dr_regs.uds.ds32.__dr5;
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case 6:
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return dr_regs.uds.ds32.__dr6;
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case 7:
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return dr_regs.uds.ds32.__dr7;
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default:
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return -1;
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}
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}
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void
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i386_darwin_dr_set_control (unsigned long control)
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{
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i386_darwin_dr_set (DR_CONTROL, control);
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}
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void
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i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
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}
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void
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i386_darwin_dr_reset_addr (int regnum)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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i386_darwin_dr_set (DR_FIRSTADDR + regnum, 0L);
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}
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unsigned long
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i386_darwin_dr_get_status (void)
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{
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return i386_darwin_dr_get (DR_STATUS);
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}
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void
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darwin_check_osabi (darwin_inferior *inf, thread_t thread)
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{
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if (gdbarch_osabi (target_gdbarch) == GDB_OSABI_UNKNOWN)
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{
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/* Attaching to a process. Let's figure out what kind it is. */
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x86_thread_state_t gp_regs;
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struct gdbarch_info info;
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unsigned int gp_count = x86_THREAD_STATE_COUNT;
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kern_return_t ret;
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ret = thread_get_state (thread, x86_THREAD_STATE,
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(thread_state_t) &gp_regs, &gp_count);
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if (ret != KERN_SUCCESS)
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{
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MACH_CHECK_ERROR (ret);
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return;
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}
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gdbarch_info_init (&info);
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gdbarch_info_fill (&info);
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info.byte_order = gdbarch_byte_order (target_gdbarch);
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info.osabi = GDB_OSABI_DARWIN;
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if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
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info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
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bfd_mach_x86_64);
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else
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info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
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bfd_mach_i386_i386);
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gdbarch_update_p (info);
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}
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}
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#define X86_EFLAGS_T 0x100UL
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/* Returning from a signal trampoline is done by calling a
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special system call (sigreturn). This system call
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restores the registers that were saved when the signal was
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raised, including %eflags/%rflags. That means that single-stepping
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won't work. Instead, we'll have to modify the signal context
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that's about to be restored, and set the trace flag there. */
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static int
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i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
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static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
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gdb_byte buf[sizeof (darwin_syscall)];
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/* Check if PC is at a sigreturn system call. */
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if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
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&& memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
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&& regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
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{
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ULONGEST uctx_addr;
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ULONGEST mctx_addr;
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ULONGEST flags_addr;
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unsigned int eflags;
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uctx_addr = read_memory_unsigned_integer
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(regs->uts.ts32.__esp + 4, 4, byte_order);
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mctx_addr = read_memory_unsigned_integer
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(uctx_addr + 28, 4, byte_order);
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flags_addr = mctx_addr + 12 + 9 * 4;
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read_memory (flags_addr, (gdb_byte *) &eflags, 4);
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eflags |= X86_EFLAGS_T;
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write_memory (flags_addr, (gdb_byte *) &eflags, 4);
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return 1;
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}
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return 0;
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}
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#ifdef BFD64
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static int
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amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
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static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
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gdb_byte buf[sizeof (darwin_syscall)];
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/* Check if PC is at a sigreturn system call. */
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if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
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&& memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
|
|
&& (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
|
|
{
|
|
ULONGEST mctx_addr;
|
|
ULONGEST flags_addr;
|
|
unsigned int rflags;
|
|
|
|
mctx_addr = read_memory_unsigned_integer
|
|
(regs->uts.ts64.__rdi + 48, 8, byte_order);
|
|
flags_addr = mctx_addr + 16 + 17 * 8;
|
|
|
|
/* AMD64 is little endian. */
|
|
read_memory (flags_addr, (gdb_byte *) &rflags, 4);
|
|
rflags |= X86_EFLAGS_T;
|
|
write_memory (flags_addr, (gdb_byte *) &rflags, 4);
|
|
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
darwin_set_sstep (thread_t thread, int enable)
|
|
{
|
|
x86_thread_state_t regs;
|
|
unsigned int count = x86_THREAD_STATE_COUNT;
|
|
kern_return_t kret;
|
|
|
|
kret = thread_get_state (thread, x86_THREAD_STATE,
|
|
(thread_state_t) ®s, &count);
|
|
if (kret != KERN_SUCCESS)
|
|
{
|
|
printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
|
|
kret, thread);
|
|
return;
|
|
}
|
|
|
|
switch (regs.tsh.flavor)
|
|
{
|
|
case x86_THREAD_STATE32:
|
|
{
|
|
__uint32_t bit = enable ? X86_EFLAGS_T : 0;
|
|
|
|
if (enable && i386_darwin_sstep_at_sigreturn (®s))
|
|
return;
|
|
if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit)
|
|
return;
|
|
regs.uts.ts32.__eflags = (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) | bit;
|
|
kret = thread_set_state (thread, x86_THREAD_STATE,
|
|
(thread_state_t) ®s, count);
|
|
MACH_CHECK_ERROR (kret);
|
|
}
|
|
break;
|
|
#ifdef BFD64
|
|
case x86_THREAD_STATE64:
|
|
{
|
|
__uint64_t bit = enable ? X86_EFLAGS_T : 0;
|
|
|
|
if (enable && amd64_darwin_sstep_at_sigreturn (®s))
|
|
return;
|
|
if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit)
|
|
return;
|
|
regs.uts.ts64.__rflags = (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) | bit;
|
|
kret = thread_set_state (thread, x86_THREAD_STATE,
|
|
(thread_state_t) ®s, count);
|
|
MACH_CHECK_ERROR (kret);
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
error (_("darwin_set_sstep: unknown flavour: %d\n"), regs.tsh.flavor);
|
|
}
|
|
}
|
|
|
|
void
|
|
darwin_complete_target (struct target_ops *target)
|
|
{
|
|
#ifdef BFD64
|
|
amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
|
|
amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs;
|
|
amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset;
|
|
amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs;
|
|
#endif
|
|
|
|
target->to_fetch_registers = i386_darwin_fetch_inferior_registers;
|
|
target->to_store_registers = i386_darwin_store_inferior_registers;
|
|
}
|