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- /* Darwin support for GDB, the GNU debugger.
- Copyright (C) 1997-2022 Free Software Foundation, Inc.
- Contributed by Apple Computer, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "target.h"
- #include "symfile.h"
- #include "symtab.h"
- #include "objfiles.h"
- #include "gdbcmd.h"
- #include "regcache.h"
- #include "i386-tdep.h"
- #include "i387-tdep.h"
- #include "gdbarch.h"
- #include "arch-utils.h"
- #include "gdbcore.h"
- #include "x86-nat.h"
- #include "darwin-nat.h"
- #include "i386-darwin-tdep.h"
- #ifdef BFD64
- #include "amd64-nat.h"
- #include "amd64-tdep.h"
- #include "amd64-darwin-tdep.h"
- #endif
- struct i386_darwin_nat_target final : public x86_nat_target<darwin_nat_target>
- {
- /* Add our register access methods. */
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static struct i386_darwin_nat_target darwin_target;
- /* Read register values from the inferior process.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
- void
- i386_darwin_nat_target::fetch_registers (struct regcache *regcache, int regno)
- {
- thread_t current_thread = regcache->ptid ().tid ();
- int fetched = 0;
- struct gdbarch *gdbarch = regcache->arch ();
- #ifdef BFD64
- if (gdbarch_ptr_bit (gdbarch) == 64)
- {
- if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
- {
- x86_thread_state_t gp_regs;
- unsigned int gp_count = x86_THREAD_STATE_COUNT;
- kern_return_t ret;
- ret = thread_get_state
- (current_thread, x86_THREAD_STATE, (thread_state_t) & gp_regs,
- &gp_count);
- if (ret != KERN_SUCCESS)
- {
- warning (_("Error calling thread_get_state for "
- "GP registers for thread 0x%lx\n"),
- (unsigned long) current_thread);
- MACH_CHECK_ERROR (ret);
- }
- /* Some kernels don't sanitize the values. */
- gp_regs.uts.ts64.__fs &= 0xffff;
- gp_regs.uts.ts64.__gs &= 0xffff;
- amd64_supply_native_gregset (regcache, &gp_regs.uts, -1);
- fetched++;
- }
- if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
- {
- x86_float_state_t fp_regs;
- unsigned int fp_count = x86_FLOAT_STATE_COUNT;
- kern_return_t ret;
- ret = thread_get_state
- (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
- &fp_count);
- if (ret != KERN_SUCCESS)
- {
- warning (_("Error calling thread_get_state for "
- "float registers for thread 0x%lx\n"),
- (unsigned long) current_thread);
- MACH_CHECK_ERROR (ret);
- }
- amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw);
- fetched++;
- }
- }
- else
- #endif
- {
- if (regno == -1 || regno < I386_NUM_GREGS)
- {
- x86_thread_state32_t gp_regs;
- unsigned int gp_count = x86_THREAD_STATE32_COUNT;
- kern_return_t ret;
- int i;
- ret = thread_get_state
- (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
- &gp_count);
- if (ret != KERN_SUCCESS)
- {
- warning (_("Error calling thread_get_state for "
- "GP registers for thread 0x%lx\n"),
- (unsigned long) current_thread);
- MACH_CHECK_ERROR (ret);
- }
- for (i = 0; i < I386_NUM_GREGS; i++)
- regcache->raw_supply
- (i, (char *) &gp_regs + i386_darwin_thread_state_reg_offset[i]);
- fetched++;
- }
- if (regno == -1
- || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
- {
- x86_float_state32_t fp_regs;
- unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
- kern_return_t ret;
- ret = thread_get_state
- (current_thread, x86_FLOAT_STATE32, (thread_state_t) &fp_regs,
- &fp_count);
- if (ret != KERN_SUCCESS)
- {
- warning (_("Error calling thread_get_state for "
- "float registers for thread 0x%lx\n"),
- (unsigned long) current_thread);
- MACH_CHECK_ERROR (ret);
- }
- i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw);
- fetched++;
- }
- }
- if (! fetched)
- {
- warning (_("unknown register %d"), regno);
- regcache->raw_supply (regno, NULL);
- }
- }
- /* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
- void
- i386_darwin_nat_target::store_registers (struct regcache *regcache,
- int regno)
- {
- thread_t current_thread = regcache->ptid ().tid ();
- struct gdbarch *gdbarch = regcache->arch ();
- #ifdef BFD64
- if (gdbarch_ptr_bit (gdbarch) == 64)
- {
- if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
- {
- x86_thread_state_t gp_regs;
- kern_return_t ret;
- unsigned int gp_count = x86_THREAD_STATE_COUNT;
- ret = thread_get_state
- (current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs,
- &gp_count);
- MACH_CHECK_ERROR (ret);
- gdb_assert (gp_regs.tsh.flavor == x86_THREAD_STATE64);
- gdb_assert (gp_regs.tsh.count == x86_THREAD_STATE64_COUNT);
- amd64_collect_native_gregset (regcache, &gp_regs.uts, regno);
- /* Some kernels don't sanitize the values. */
- gp_regs.uts.ts64.__fs &= 0xffff;
- gp_regs.uts.ts64.__gs &= 0xffff;
- ret = thread_set_state (current_thread, x86_THREAD_STATE,
- (thread_state_t) &gp_regs,
- x86_THREAD_STATE_COUNT);
- MACH_CHECK_ERROR (ret);
- }
- if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
- {
- x86_float_state_t fp_regs;
- kern_return_t ret;
- unsigned int fp_count = x86_FLOAT_STATE_COUNT;
- ret = thread_get_state
- (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
- &fp_count);
- MACH_CHECK_ERROR (ret);
- gdb_assert (fp_regs.fsh.flavor == x86_FLOAT_STATE64);
- gdb_assert (fp_regs.fsh.count == x86_FLOAT_STATE64_COUNT);
- amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw);
- ret = thread_set_state (current_thread, x86_FLOAT_STATE,
- (thread_state_t) & fp_regs,
- x86_FLOAT_STATE_COUNT);
- MACH_CHECK_ERROR (ret);
- }
- }
- else
- #endif
- {
- if (regno == -1 || regno < I386_NUM_GREGS)
- {
- x86_thread_state32_t gp_regs;
- kern_return_t ret;
- unsigned int gp_count = x86_THREAD_STATE32_COUNT;
- int i;
- ret = thread_get_state
- (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
- &gp_count);
- MACH_CHECK_ERROR (ret);
- for (i = 0; i < I386_NUM_GREGS; i++)
- if (regno == -1 || regno == i)
- regcache->raw_collect
- (i, (char *) &gp_regs + i386_darwin_thread_state_reg_offset[i]);
- ret = thread_set_state (current_thread, x86_THREAD_STATE32,
- (thread_state_t) &gp_regs,
- x86_THREAD_STATE32_COUNT);
- MACH_CHECK_ERROR (ret);
- }
- if (regno == -1
- || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
- {
- x86_float_state32_t fp_regs;
- unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
- kern_return_t ret;
- ret = thread_get_state
- (current_thread, x86_FLOAT_STATE32, (thread_state_t) & fp_regs,
- &fp_count);
- MACH_CHECK_ERROR (ret);
- i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw);
- ret = thread_set_state (current_thread, x86_FLOAT_STATE32,
- (thread_state_t) &fp_regs,
- x86_FLOAT_STATE32_COUNT);
- MACH_CHECK_ERROR (ret);
- }
- }
- }
- /* Support for debug registers, boosted mostly from i386-linux-nat.c. */
- static void
- i386_darwin_dr_set (int regnum, CORE_ADDR value)
- {
- thread_t current_thread;
- x86_debug_state_t dr_regs;
- kern_return_t ret;
- unsigned int dr_count;
- gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
- current_thread = inferior_ptid.tid ();
- dr_regs.dsh.flavor = x86_DEBUG_STATE;
- dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
- dr_count = x86_DEBUG_STATE_COUNT;
- ret = thread_get_state (current_thread, x86_DEBUG_STATE,
- (thread_state_t) &dr_regs, &dr_count);
- MACH_CHECK_ERROR (ret);
- switch (dr_regs.dsh.flavor)
- {
- case x86_DEBUG_STATE32:
- switch (regnum)
- {
- case 0:
- dr_regs.uds.ds32.__dr0 = value;
- break;
- case 1:
- dr_regs.uds.ds32.__dr1 = value;
- break;
- case 2:
- dr_regs.uds.ds32.__dr2 = value;
- break;
- case 3:
- dr_regs.uds.ds32.__dr3 = value;
- break;
- case 4:
- dr_regs.uds.ds32.__dr4 = value;
- break;
- case 5:
- dr_regs.uds.ds32.__dr5 = value;
- break;
- case 6:
- dr_regs.uds.ds32.__dr6 = value;
- break;
- case 7:
- dr_regs.uds.ds32.__dr7 = value;
- break;
- }
- break;
- #ifdef BFD64
- case x86_DEBUG_STATE64:
- switch (regnum)
- {
- case 0:
- dr_regs.uds.ds64.__dr0 = value;
- break;
- case 1:
- dr_regs.uds.ds64.__dr1 = value;
- break;
- case 2:
- dr_regs.uds.ds64.__dr2 = value;
- break;
- case 3:
- dr_regs.uds.ds64.__dr3 = value;
- break;
- case 4:
- dr_regs.uds.ds64.__dr4 = value;
- break;
- case 5:
- dr_regs.uds.ds64.__dr5 = value;
- break;
- case 6:
- dr_regs.uds.ds64.__dr6 = value;
- break;
- case 7:
- dr_regs.uds.ds64.__dr7 = value;
- break;
- }
- break;
- #endif
- }
- ret = thread_set_state (current_thread, dr_regs.dsh.flavor,
- (thread_state_t) &dr_regs.uds, dr_count);
- MACH_CHECK_ERROR (ret);
- }
- static CORE_ADDR
- i386_darwin_dr_get (int regnum)
- {
- thread_t current_thread;
- x86_debug_state_t dr_regs;
- kern_return_t ret;
- unsigned int dr_count;
- gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
- current_thread = inferior_ptid.tid ();
- dr_regs.dsh.flavor = x86_DEBUG_STATE;
- dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
- dr_count = x86_DEBUG_STATE_COUNT;
- ret = thread_get_state (current_thread, x86_DEBUG_STATE,
- (thread_state_t) &dr_regs, &dr_count);
- MACH_CHECK_ERROR (ret);
- switch (dr_regs.dsh.flavor)
- {
- case x86_DEBUG_STATE32:
- switch (regnum)
- {
- case 0:
- return dr_regs.uds.ds32.__dr0;
- case 1:
- return dr_regs.uds.ds32.__dr1;
- case 2:
- return dr_regs.uds.ds32.__dr2;
- case 3:
- return dr_regs.uds.ds32.__dr3;
- case 4:
- return dr_regs.uds.ds32.__dr4;
- case 5:
- return dr_regs.uds.ds32.__dr5;
- case 6:
- return dr_regs.uds.ds32.__dr6;
- case 7:
- return dr_regs.uds.ds32.__dr7;
- default:
- return -1;
- }
- break;
- #ifdef BFD64
- case x86_DEBUG_STATE64:
- switch (regnum)
- {
- case 0:
- return dr_regs.uds.ds64.__dr0;
- case 1:
- return dr_regs.uds.ds64.__dr1;
- case 2:
- return dr_regs.uds.ds64.__dr2;
- case 3:
- return dr_regs.uds.ds64.__dr3;
- case 4:
- return dr_regs.uds.ds64.__dr4;
- case 5:
- return dr_regs.uds.ds64.__dr5;
- case 6:
- return dr_regs.uds.ds64.__dr6;
- case 7:
- return dr_regs.uds.ds64.__dr7;
- default:
- return -1;
- }
- break;
- #endif
- default:
- return -1;
- }
- }
- static void
- i386_darwin_dr_set_control (unsigned long control)
- {
- i386_darwin_dr_set (DR_CONTROL, control);
- }
- static void
- i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
- {
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
- }
- static CORE_ADDR
- i386_darwin_dr_get_addr (int regnum)
- {
- return i386_darwin_dr_get (regnum);
- }
- static unsigned long
- i386_darwin_dr_get_status (void)
- {
- return i386_darwin_dr_get (DR_STATUS);
- }
- static unsigned long
- i386_darwin_dr_get_control (void)
- {
- return i386_darwin_dr_get (DR_CONTROL);
- }
- void
- darwin_check_osabi (darwin_inferior *inf, thread_t thread)
- {
- if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN)
- {
- /* Attaching to a process. Let's figure out what kind it is. */
- x86_thread_state_t gp_regs;
- unsigned int gp_count = x86_THREAD_STATE_COUNT;
- kern_return_t ret;
- ret = thread_get_state (thread, x86_THREAD_STATE,
- (thread_state_t) &gp_regs, &gp_count);
- if (ret != KERN_SUCCESS)
- {
- MACH_CHECK_ERROR (ret);
- return;
- }
- gdbarch_info info;
- gdbarch_info_fill (&info);
- info.byte_order = gdbarch_byte_order (target_gdbarch ());
- info.osabi = GDB_OSABI_DARWIN;
- if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
- info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
- bfd_mach_x86_64);
- else
- info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
- bfd_mach_i386_i386);
- gdbarch_update_p (info);
- }
- }
- #define X86_EFLAGS_T 0x100UL
- /* Returning from a signal trampoline is done by calling a
- special system call (sigreturn). This system call
- restores the registers that were saved when the signal was
- raised, including %eflags/%rflags. That means that single-stepping
- won't work. Instead, we'll have to modify the signal context
- that's about to be restored, and set the trace flag there. */
- static int
- i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
- static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
- gdb_byte buf[sizeof (darwin_syscall)];
- /* Check if PC is at a sigreturn system call. */
- if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
- && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
- && regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
- {
- ULONGEST uctx_addr;
- ULONGEST mctx_addr;
- ULONGEST flags_addr;
- unsigned int eflags;
- uctx_addr = read_memory_unsigned_integer
- (regs->uts.ts32.__esp + 4, 4, byte_order);
- mctx_addr = read_memory_unsigned_integer
- (uctx_addr + 28, 4, byte_order);
- flags_addr = mctx_addr + 12 + 9 * 4;
- read_memory (flags_addr, (gdb_byte *) &eflags, 4);
- eflags |= X86_EFLAGS_T;
- write_memory (flags_addr, (gdb_byte *) &eflags, 4);
- return 1;
- }
- return 0;
- }
- #ifdef BFD64
- static int
- amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
- static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
- gdb_byte buf[sizeof (darwin_syscall)];
- /* Check if PC is at a sigreturn system call. */
- if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
- && 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)
- {
- warning (_("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"), regs.tsh.flavor);
- }
- }
- void _initialize_i386_darwin_nat ();
- void
- _initialize_i386_darwin_nat ()
- {
- #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
- x86_dr_low.set_control = i386_darwin_dr_set_control;
- x86_dr_low.set_addr = i386_darwin_dr_set_addr;
- x86_dr_low.get_addr = i386_darwin_dr_get_addr;
- x86_dr_low.get_status = i386_darwin_dr_get_status;
- x86_dr_low.get_control = i386_darwin_dr_get_control;
- /* Let's assume that the kernel is 64 bits iff the executable is. */
- #ifdef __x86_64__
- x86_set_debug_register_length (8);
- #else
- x86_set_debug_register_length (4);
- #endif
- add_inf_child_target (&darwin_target);
- }
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