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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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261 lines
8.1 KiB
ArmAsm
261 lines
8.1 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Support for doing system calls. syscall-amd64-darwin.S ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2017 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics_asm.h"
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#if defined(VGP_amd64_darwin)
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#include "pub_core_vkiscnums_asm.h"
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#include "libvex_guest_offsets.h"
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/*----------------------------------------------------------------*/
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/*
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Perform a syscall for the client. This will run a syscall
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with the client's specific per-thread signal mask.
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The structure of this function is such that, if the syscall is
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interrupted by a signal, we can determine exactly what
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execution state we were in with respect to the execution of
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the syscall by examining the value of %eip in the signal
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handler. This means that we can always do the appropriate
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thing to precisely emulate the kernel's signal/syscall
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interactions.
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The syscall number is taken from the argument, even though it
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should also be in guest_state->guest_RAX. The syscall result
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is written back to guest_state->guest_RAX on completion.
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Returns 0 if the syscall was successfully called (even if the
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syscall itself failed), or a -ve error code if one of the
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sigprocmasks failed (there's no way to determine which one
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failed).
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VG_(fixup_guest_state_after_syscall_interrupted) does the
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thread state fixup in the case where we were interrupted by a
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signal.
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Prototype:
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Int ML_(do_syscall_for_client_WRK(
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Int syscallno, // rdi
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void* guest_state, // rsi
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const vki_sigset_t *sysmask, // rdx
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const vki_sigset_t *postmask, // rcx
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Int sigsetSzB) // r8
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Note that sigsetSzB is totally ignored (and irrelevant).
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*/
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/* from vki_arch.h */
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#define VKI_SIG_SETMASK 3
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/* DO_SYSCALL MACH|MDEP|UNIX */
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#define MACH 1
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#define MDEP 2
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#define UNIX 3
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.macro DO_SYSCALL
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/* save callee-saved regs */
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pushq %rbp
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movq %rsp, %rbp
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// stack is now aligned
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pushq %rdi // -8(%rbp) syscallno
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pushq %rsi // -16(%rbp) guest_state
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pushq %rdx // -24(%rbp) sysmask
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pushq %rcx // -32(%rbp) postmask
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pushq %r8 // -40(%rbp) sigsetSzB
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// stack is now aligned
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L_$0_1: /* Even though we can't take a signal until the sigprocmask completes,
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start the range early.
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If rip is in the range [1,2), the syscall hasn't been started yet */
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/* Set the signal mask which should be current during the syscall. */
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/* GrP fixme signals
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DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask
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movq $__NR_rt_sigprocmask, %rax // syscall #
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movq $VKI_SIG_SETMASK, %rdi // how
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movq -24(%rbp), %rsi // sysmask
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movq -32(%rbp), %rdx // postmask
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movq -40(%rbp), %r10 // sigsetSzB in r10 not rcx
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DDD: fixme return address
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syscall
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jnc 7f // sigprocmask failed
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*/
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/* OK, that worked. Now do the syscall proper. */
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/* 6 register parameters */
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movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */
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movq OFFSET_amd64_RDI(%r11), %rdi
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movq OFFSET_amd64_RSI(%r11), %rsi
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movq OFFSET_amd64_RDX(%r11), %rdx
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movq OFFSET_amd64_RCX(%r11), %r10 /* rcx is passed in r10 instead */
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movq OFFSET_amd64_R8(%r11), %r8
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movq OFFSET_amd64_R9(%r11), %r9
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/* 2 stack parameters plus return address (ignored by syscall) */
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movq OFFSET_amd64_RSP(%r11), %r11 /* r11 = simulated RSP */
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movq 16(%r11), %rax
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pushq %rax
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movq 8(%r11), %rax
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pushq %rax
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/* stack is currently aligned - return address misaligns */
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movq 0(%r11), %rax
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pushq %rax
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/* syscallno */
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movq -8(%rbp), %rax
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/* If rip==2, then the syscall was either just about
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to start, or was interrupted and the kernel was
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restarting it. */
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L_$0_2: syscall
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L_$0_3: /* In the range [3, 4), the syscall result is in %rax,
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but hasn't been committed to RAX. */
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/* stack contents: 3 words for syscall above, plus our prologue */
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setc 0(%rsp) /* stash returned carry flag */
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movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */
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movq %rax, OFFSET_amd64_RAX(%r11) /* save back to RAX */
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movq %rdx, OFFSET_amd64_RDX(%r11) /* save back to RDX */
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.if $0 == UNIX
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/* save carry flag to VEX */
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xor %rax, %rax
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movb 0(%rsp), %al
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movq %rax, %rdi /* arg1 = new flag */
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movq %r11, %rsi /* arg2 = vex state */
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addq $$24, %rsp /* remove syscall parameters */
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call _LibVEX_GuestAMD64_put_rflag_c
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.else
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addq $$24, %rsp /* remove syscall parameters*/
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.endif
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L_$0_4: /* Re-block signals. If eip is in [4,5), then the syscall
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is complete and we needn't worry about it. */
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/* GrP fixme signals
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DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask
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PUSH_di_si_dx_cx_8
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movq $__NR_rt_sigprocmask, %rax // syscall #
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movq $VKI_SIG_SETMASK, %rdi // how
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movq %rcx, %rsi // postmask
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xorq %rdx, %rdx // NULL
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movq %r8, %r10 // sigsetSzB
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DDD: fixme return address
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syscall
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POP_di_si_dx_cx_8
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jnc 7f // sigprocmask failed
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*/
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L_$0_5: /* now safe from signals */
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movq $$0, %rax /* SUCCESS */
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movq %rbp, %rsp
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popq %rbp
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ret
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/* GrP fixme signals
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L_$0_7: // failure: return 0x8000 | error code
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DDD: fixme return value
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movq %rbp, %rsp
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popq %rbp
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ret
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*/
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.endmacro
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.globl ML_(do_syscall_for_client_unix_WRK)
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ML_(do_syscall_for_client_unix_WRK):
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DO_SYSCALL UNIX
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.globl ML_(do_syscall_for_client_mach_WRK)
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ML_(do_syscall_for_client_mach_WRK):
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DO_SYSCALL MACH
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.globl ML_(do_syscall_for_client_mdep_WRK)
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ML_(do_syscall_for_client_mdep_WRK):
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DO_SYSCALL MDEP
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.data
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/* export the ranges so that
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VG_(fixup_guest_state_after_syscall_interrupted) can do the
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right thing */
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/* eg MK_L_SCLASS_N(UNIX,99) produces L_3_99
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since UNIX is #defined to 3 at the top of this file */
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#define FOO(scclass,labelno) L_##scclass##_##labelno
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#define MK_L_SCCLASS_N(scclass,labelno) FOO(scclass,labelno)
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.globl ML_(blksys_setup_MACH)
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.globl ML_(blksys_restart_MACH)
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.globl ML_(blksys_complete_MACH)
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.globl ML_(blksys_committed_MACH)
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.globl ML_(blksys_finished_MACH)
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ML_(blksys_setup_MACH): .quad MK_L_SCCLASS_N(MACH,1)
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ML_(blksys_restart_MACH): .quad MK_L_SCCLASS_N(MACH,2)
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ML_(blksys_complete_MACH): .quad MK_L_SCCLASS_N(MACH,3)
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ML_(blksys_committed_MACH): .quad MK_L_SCCLASS_N(MACH,4)
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ML_(blksys_finished_MACH): .quad MK_L_SCCLASS_N(MACH,5)
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.globl ML_(blksys_setup_MDEP)
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.globl ML_(blksys_restart_MDEP)
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.globl ML_(blksys_complete_MDEP)
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.globl ML_(blksys_committed_MDEP)
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.globl ML_(blksys_finished_MDEP)
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ML_(blksys_setup_MDEP): .quad MK_L_SCCLASS_N(MDEP,1)
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ML_(blksys_restart_MDEP): .quad MK_L_SCCLASS_N(MDEP,2)
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ML_(blksys_complete_MDEP): .quad MK_L_SCCLASS_N(MDEP,3)
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ML_(blksys_committed_MDEP): .quad MK_L_SCCLASS_N(MDEP,4)
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ML_(blksys_finished_MDEP): .quad MK_L_SCCLASS_N(MDEP,5)
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.globl ML_(blksys_setup_UNIX)
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.globl ML_(blksys_restart_UNIX)
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.globl ML_(blksys_complete_UNIX)
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.globl ML_(blksys_committed_UNIX)
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.globl ML_(blksys_finished_UNIX)
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ML_(blksys_setup_UNIX): .quad MK_L_SCCLASS_N(UNIX,1)
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ML_(blksys_restart_UNIX): .quad MK_L_SCCLASS_N(UNIX,2)
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ML_(blksys_complete_UNIX): .quad MK_L_SCCLASS_N(UNIX,3)
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ML_(blksys_committed_UNIX): .quad MK_L_SCCLASS_N(UNIX,4)
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ML_(blksys_finished_UNIX): .quad MK_L_SCCLASS_N(UNIX,5)
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#endif // defined(VGP_amd64_darwin)
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/* Let the linker know we don't need an executable stack */
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MARK_STACK_NO_EXEC
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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