2 /*--------------------------------------------------------------------*/
3 /*--- Support for doing system calls. syscall-amd64-darwin.S ---*/
4 /*--------------------------------------------------------------------*/
7 This file is part of Valgrind, a dynamic binary instrumentation
10 Copyright (C) 2000-2007 Julian Seward
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of the
16 License, or (at your option) any later version.
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 The GNU General Public License is contained in the file COPYING.
31 #if defined(VGP_amd64_darwin)
33 #include "pub_core_basics_asm.h"
34 #include "pub_core_vkiscnums_asm.h"
35 #include "libvex_guest_offsets.h"
38 /*----------------------------------------------------------------*/
40 Perform a syscall for the client. This will run a syscall
41 with the client's specific per-thread signal mask.
43 The structure of this function is such that, if the syscall is
44 interrupted by a signal, we can determine exactly what
45 execution state we were in with respect to the execution of
46 the syscall by examining the value of %eip in the signal
47 handler. This means that we can always do the appropriate
48 thing to precisely emulate the kernel's signal/syscall
51 The syscall number is taken from the argument, even though it
52 should also be in guest_state->guest_RAX. The syscall result
53 is written back to guest_state->guest_RAX on completion.
55 Returns 0 if the syscall was successfully called (even if the
56 syscall itself failed), or a -ve error code if one of the
57 sigprocmasks failed (there's no way to determine which one
60 VG_(fixup_guest_state_after_syscall_interrupted) does the
61 thread state fixup in the case where we were interrupted by a
66 Int ML_(do_syscall_for_client_WRK(
68 void* guest_state, // rsi
69 const vki_sigset_t *sysmask, // rdx
70 const vki_sigset_t *postmask, // rcx
73 Note that sigsetSzB is totally ignored (and irrelevant).
77 #define VKI_SIG_SETMASK 3
79 /* DO_SYSCALL MACH|MDEP|UNIX */
85 /* save callee-saved regs */
88 // stack is now aligned
89 pushq %rdi // -8(%rbp) syscallno
90 pushq %rsi // -16(%rbp) guest_state
91 pushq %rdx // -24(%rbp) sysmask
92 pushq %rcx // -32(%rbp) postmask
93 pushq %r8 // -40(%rbp) sigsetSzB
94 // stack is now aligned
96 L_$0_1: /* Even though we can't take a signal until the sigprocmask completes,
97 start the range early.
98 If rip is in the range [1,2), the syscall hasn't been started yet */
100 /* Set the signal mask which should be current during the syscall. */
102 DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask
103 movq $__NR_rt_sigprocmask, %rax // syscall #
104 movq $VKI_SIG_SETMASK, %rdi // how
105 movq -24(%rbp), %rsi // sysmask
106 movq -32(%rbp), %rdx // postmask
107 movq -40(%rbp), %r10 // sigsetSzB in r10 not rcx
108 DDD: fixme return address
111 jnc 7f // sigprocmask failed
114 /* OK, that worked. Now do the syscall proper. */
116 /* 6 register parameters */
117 movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */
118 movq OFFSET_amd64_RDI(%r11), %rdi
119 movq OFFSET_amd64_RSI(%r11), %rsi
120 movq OFFSET_amd64_RDX(%r11), %rdx
121 movq OFFSET_amd64_RCX(%r11), %r10 /* rcx is passed in r10 instead */
122 movq OFFSET_amd64_R8(%r11), %r8
123 movq OFFSET_amd64_R9(%r11), %r9
124 /* 2 stack parameters plus return address (ignored by syscall) */
125 movq OFFSET_amd64_RSP(%r11), %r11 /* r11 = simulated RSP */
130 /* stack is currently aligned - return address misaligns */
136 /* If rip==2, then the syscall was either just about
137 to start, or was interrupted and the kernel was
140 L_$0_3: /* In the range [3, 4), the syscall result is in %rax,
141 but hasn't been committed to RAX. */
143 /* stack contents: 3 words for syscall above, plus our prologue */
144 setc 0(%rsp) /* stash returned carry flag */
146 movq -16(%rbp), %r11 /* r11 = VexGuestAMD64State * */
147 movq %rax, OFFSET_amd64_RAX(%r11) /* save back to RAX */
148 movq %rdx, OFFSET_amd64_RDX(%r11) /* save back to RDX */
151 /* save carry flag to VEX */
154 movq %rax, %rdi /* arg1 = new flag */
155 movq %r11, %rsi /* arg2 = vex state */
156 addq $$24, %rsp /* remove syscall parameters */
157 call _LibVEX_GuestAMD64_put_rflag_c
159 addq $$24, %rsp /* remove syscall parameters*/
162 L_$0_4: /* Re-block signals. If eip is in [4,5), then the syscall
163 is complete and we needn't worry about it. */
165 DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask
168 movq $__NR_rt_sigprocmask, %rax // syscall #
169 movq $VKI_SIG_SETMASK, %rdi // how
170 movq %rcx, %rsi // postmask
171 xorq %rdx, %rdx // NULL
172 movq %r8, %r10 // sigsetSzB
173 DDD: fixme return address
178 jnc 7f // sigprocmask failed
180 L_$0_5: /* now safe from signals */
181 movq $$0, %rax /* SUCCESS */
187 L_$0_7: // failure: return 0x8000 | error code
188 DDD: fixme return value
197 .globl ML_(do_syscall_for_client_unix_WRK)
198 ML_(do_syscall_for_client_unix_WRK):
201 .globl ML_(do_syscall_for_client_mach_WRK)
202 ML_(do_syscall_for_client_mach_WRK):
205 .globl ML_(do_syscall_for_client_mdep_WRK)
206 ML_(do_syscall_for_client_mdep_WRK):
210 /* export the ranges so that
211 VG_(fixup_guest_state_after_syscall_interrupted) can do the
214 /* eg MK_L_SCLASS_N(UNIX,99) produces L_3_99
215 since UNIX is #defined to 3 at the top of this file */
216 #define FOO(scclass,labelno) L_##scclass##_##labelno
217 #define MK_L_SCCLASS_N(scclass,labelno) FOO(scclass,labelno)
219 .globl ML_(blksys_setup_MACH)
220 .globl ML_(blksys_restart_MACH)
221 .globl ML_(blksys_complete_MACH)
222 .globl ML_(blksys_committed_MACH)
223 .globl ML_(blksys_finished_MACH)
224 ML_(blksys_setup_MACH): .quad MK_L_SCCLASS_N(MACH,1)
225 ML_(blksys_restart_MACH): .quad MK_L_SCCLASS_N(MACH,2)
226 ML_(blksys_complete_MACH): .quad MK_L_SCCLASS_N(MACH,3)
227 ML_(blksys_committed_MACH): .quad MK_L_SCCLASS_N(MACH,4)
228 ML_(blksys_finished_MACH): .quad MK_L_SCCLASS_N(MACH,5)
230 .globl ML_(blksys_setup_MDEP)
231 .globl ML_(blksys_restart_MDEP)
232 .globl ML_(blksys_complete_MDEP)
233 .globl ML_(blksys_committed_MDEP)
234 .globl ML_(blksys_finished_MDEP)
235 ML_(blksys_setup_MDEP): .quad MK_L_SCCLASS_N(MDEP,1)
236 ML_(blksys_restart_MDEP): .quad MK_L_SCCLASS_N(MDEP,2)
237 ML_(blksys_complete_MDEP): .quad MK_L_SCCLASS_N(MDEP,3)
238 ML_(blksys_committed_MDEP): .quad MK_L_SCCLASS_N(MDEP,4)
239 ML_(blksys_finished_MDEP): .quad MK_L_SCCLASS_N(MDEP,5)
241 .globl ML_(blksys_setup_UNIX)
242 .globl ML_(blksys_restart_UNIX)
243 .globl ML_(blksys_complete_UNIX)
244 .globl ML_(blksys_committed_UNIX)
245 .globl ML_(blksys_finished_UNIX)
246 ML_(blksys_setup_UNIX): .quad MK_L_SCCLASS_N(UNIX,1)
247 ML_(blksys_restart_UNIX): .quad MK_L_SCCLASS_N(UNIX,2)
248 ML_(blksys_complete_UNIX): .quad MK_L_SCCLASS_N(UNIX,3)
249 ML_(blksys_committed_UNIX): .quad MK_L_SCCLASS_N(UNIX,4)
250 ML_(blksys_finished_UNIX): .quad MK_L_SCCLASS_N(UNIX,5)
252 #endif // defined(VGP_amd64_darwin)
254 /*--------------------------------------------------------------------*/
256 /*--------------------------------------------------------------------*/