| |
| /*--------------------------------------------------------------------*/ |
| /*--- Support for doing system calls. syscall-amd64-darwin.S ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2013 Julian Seward |
| jseward@acm.org |
| |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #if defined(VGP_amd64_darwin) |
| |
| #include "pub_core_basics_asm.h" |
| #include "pub_core_vkiscnums_asm.h" |
| #include "libvex_guest_offsets.h" |
| |
| |
| /*----------------------------------------------------------------*/ |
| /* |
| Perform a syscall for the client. This will run a syscall |
| with the client's specific per-thread signal mask. |
| |
| The structure of this function is such that, if the syscall is |
| interrupted by a signal, we can determine exactly what |
| execution state we were in with respect to the execution of |
| the syscall by examining the value of %eip in the signal |
| handler. This means that we can always do the appropriate |
| thing to precisely emulate the kernel's signal/syscall |
| interactions. |
| |
| The syscall number is taken from the argument, even though it |
| should also be in guest_state->guest_RAX. The syscall result |
| is written back to guest_state->guest_RAX on completion. |
| |
| Returns 0 if the syscall was successfully called (even if the |
| syscall itself failed), or a -ve error code if one of the |
| sigprocmasks failed (there's no way to determine which one |
| failed). |
| |
| VG_(fixup_guest_state_after_syscall_interrupted) does the |
| thread state fixup in the case where we were interrupted by a |
| signal. |
| |
| Prototype: |
| |
| Int ML_(do_syscall_for_client_WRK( |
| Int syscallno, // rdi |
| void* guest_state, // rsi |
| const vki_sigset_t *sysmask, // rdx |
| const vki_sigset_t *postmask, // rcx |
| Int sigsetSzB) // r8 |
| |
| Note that sigsetSzB is totally ignored (and irrelevant). |
| */ |
| |
| /* from vki_arch.h */ |
| #define VKI_SIG_SETMASK 3 |
| |
| /* DO_SYSCALL MACH|MDEP|UNIX */ |
| #define MACH 1 |
| #define MDEP 2 |
| #define UNIX 3 |
| |
| .macro DO_SYSCALL |
| /* save callee-saved regs */ |
| pushq %rbp |
| movq %rsp, %rbp |
| // stack is now aligned |
| pushq %rdi // -8(%rbp) syscallno |
| pushq %rsi // -16(%rbp) guest_state |
| pushq %rdx // -24(%rbp) sysmask |
| pushq %rcx // -32(%rbp) postmask |
| pushq %r8 // -40(%rbp) sigsetSzB |
| // stack is now aligned |
| |
| L_$0_1: /* Even though we can't take a signal until the sigprocmask completes, |
| start the range early. |
| If rip is in the range [1,2), the syscall hasn't been started yet */ |
| |
| /* Set the signal mask which should be current during the syscall. */ |
| /* GrP fixme signals |
| DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask |
| movq $__NR_rt_sigprocmask, %rax // syscall # |
| movq $VKI_SIG_SETMASK, %rdi // how |
| movq -24(%rbp), %rsi // sysmask |
| movq -32(%rbp), %rdx // postmask |
| movq -40(%rbp), %r10 // sigsetSzB in r10 not rcx |
| DDD: fixme return address |
| syscall |
| |
| jnc 7f // sigprocmask failed |
| */ |
| |
| /* OK, that worked. Now do the syscall proper. */ |
| |
| /* 6 register parameters */ |
| movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */ |
| movq OFFSET_amd64_RDI(%r11), %rdi |
| movq OFFSET_amd64_RSI(%r11), %rsi |
| movq OFFSET_amd64_RDX(%r11), %rdx |
| movq OFFSET_amd64_RCX(%r11), %r10 /* rcx is passed in r10 instead */ |
| movq OFFSET_amd64_R8(%r11), %r8 |
| movq OFFSET_amd64_R9(%r11), %r9 |
| /* 2 stack parameters plus return address (ignored by syscall) */ |
| movq OFFSET_amd64_RSP(%r11), %r11 /* r11 = simulated RSP */ |
| movq 16(%r11), %rax |
| pushq %rax |
| movq 8(%r11), %rax |
| pushq %rax |
| /* stack is currently aligned - return address misaligns */ |
| movq 0(%r11), %rax |
| pushq %rax |
| /* syscallno */ |
| movq -8(%rbp), %rax |
| |
| /* If rip==2, then the syscall was either just about |
| to start, or was interrupted and the kernel was |
| restarting it. */ |
| L_$0_2: syscall |
| L_$0_3: /* In the range [3, 4), the syscall result is in %rax, |
| but hasn't been committed to RAX. */ |
| |
| /* stack contents: 3 words for syscall above, plus our prologue */ |
| setc 0(%rsp) /* stash returned carry flag */ |
| |
| movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */ |
| movq %rax, OFFSET_amd64_RAX(%r11) /* save back to RAX */ |
| movq %rdx, OFFSET_amd64_RDX(%r11) /* save back to RDX */ |
| |
| .if $0 == UNIX |
| /* save carry flag to VEX */ |
| xor %rax, %rax |
| movb 0(%rsp), %al |
| movq %rax, %rdi /* arg1 = new flag */ |
| movq %r11, %rsi /* arg2 = vex state */ |
| addq $$24, %rsp /* remove syscall parameters */ |
| call _LibVEX_GuestAMD64_put_rflag_c |
| .else |
| addq $$24, %rsp /* remove syscall parameters*/ |
| .endif |
| |
| L_$0_4: /* Re-block signals. If eip is in [4,5), then the syscall |
| is complete and we needn't worry about it. */ |
| /* GrP fixme signals |
| DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask |
| PUSH_di_si_dx_cx_8 |
| |
| movq $__NR_rt_sigprocmask, %rax // syscall # |
| movq $VKI_SIG_SETMASK, %rdi // how |
| movq %rcx, %rsi // postmask |
| xorq %rdx, %rdx // NULL |
| movq %r8, %r10 // sigsetSzB |
| DDD: fixme return address |
| syscall |
| |
| POP_di_si_dx_cx_8 |
| |
| jnc 7f // sigprocmask failed |
| */ |
| L_$0_5: /* now safe from signals */ |
| movq $$0, %rax /* SUCCESS */ |
| movq %rbp, %rsp |
| popq %rbp |
| ret |
| |
| /* GrP fixme signals |
| L_$0_7: // failure: return 0x8000 | error code |
| DDD: fixme return value |
| movq %rbp, %rsp |
| popq %rbp |
| ret |
| */ |
| |
| .endmacro |
| |
| |
| .globl ML_(do_syscall_for_client_unix_WRK) |
| ML_(do_syscall_for_client_unix_WRK): |
| DO_SYSCALL UNIX |
| |
| .globl ML_(do_syscall_for_client_mach_WRK) |
| ML_(do_syscall_for_client_mach_WRK): |
| DO_SYSCALL MACH |
| |
| .globl ML_(do_syscall_for_client_mdep_WRK) |
| ML_(do_syscall_for_client_mdep_WRK): |
| DO_SYSCALL MDEP |
| |
| .data |
| /* export the ranges so that |
| VG_(fixup_guest_state_after_syscall_interrupted) can do the |
| right thing */ |
| |
| /* eg MK_L_SCLASS_N(UNIX,99) produces L_3_99 |
| since UNIX is #defined to 3 at the top of this file */ |
| #define FOO(scclass,labelno) L_##scclass##_##labelno |
| #define MK_L_SCCLASS_N(scclass,labelno) FOO(scclass,labelno) |
| |
| .globl ML_(blksys_setup_MACH) |
| .globl ML_(blksys_restart_MACH) |
| .globl ML_(blksys_complete_MACH) |
| .globl ML_(blksys_committed_MACH) |
| .globl ML_(blksys_finished_MACH) |
| ML_(blksys_setup_MACH): .quad MK_L_SCCLASS_N(MACH,1) |
| ML_(blksys_restart_MACH): .quad MK_L_SCCLASS_N(MACH,2) |
| ML_(blksys_complete_MACH): .quad MK_L_SCCLASS_N(MACH,3) |
| ML_(blksys_committed_MACH): .quad MK_L_SCCLASS_N(MACH,4) |
| ML_(blksys_finished_MACH): .quad MK_L_SCCLASS_N(MACH,5) |
| |
| .globl ML_(blksys_setup_MDEP) |
| .globl ML_(blksys_restart_MDEP) |
| .globl ML_(blksys_complete_MDEP) |
| .globl ML_(blksys_committed_MDEP) |
| .globl ML_(blksys_finished_MDEP) |
| ML_(blksys_setup_MDEP): .quad MK_L_SCCLASS_N(MDEP,1) |
| ML_(blksys_restart_MDEP): .quad MK_L_SCCLASS_N(MDEP,2) |
| ML_(blksys_complete_MDEP): .quad MK_L_SCCLASS_N(MDEP,3) |
| ML_(blksys_committed_MDEP): .quad MK_L_SCCLASS_N(MDEP,4) |
| ML_(blksys_finished_MDEP): .quad MK_L_SCCLASS_N(MDEP,5) |
| |
| .globl ML_(blksys_setup_UNIX) |
| .globl ML_(blksys_restart_UNIX) |
| .globl ML_(blksys_complete_UNIX) |
| .globl ML_(blksys_committed_UNIX) |
| .globl ML_(blksys_finished_UNIX) |
| ML_(blksys_setup_UNIX): .quad MK_L_SCCLASS_N(UNIX,1) |
| ML_(blksys_restart_UNIX): .quad MK_L_SCCLASS_N(UNIX,2) |
| ML_(blksys_complete_UNIX): .quad MK_L_SCCLASS_N(UNIX,3) |
| ML_(blksys_committed_UNIX): .quad MK_L_SCCLASS_N(UNIX,4) |
| ML_(blksys_finished_UNIX): .quad MK_L_SCCLASS_N(UNIX,5) |
| |
| #endif // defined(VGP_amd64_darwin) |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |