njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
| 3 | /*--- Support for doing system calls. syscall-amd64-darwin.S ---*/ |
| 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
| 7 | This file is part of Valgrind, a dynamic binary instrumentation |
| 8 | framework. |
| 9 | |
sewardj | 0f157dd | 2013-10-18 14:27:36 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2013 Julian Seward |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 11 | jseward@acm.org |
| 12 | |
| 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. |
| 17 | |
| 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. |
| 22 | |
| 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 |
| 26 | 02111-1307, USA. |
| 27 | |
| 28 | The GNU General Public License is contained in the file COPYING. |
| 29 | */ |
| 30 | |
njn | 8b68b64 | 2009-06-24 00:37:09 +0000 | [diff] [blame] | 31 | #if defined(VGP_amd64_darwin) |
| 32 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 33 | #include "pub_core_basics_asm.h" |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 34 | #include "pub_core_vkiscnums_asm.h" |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 35 | #include "libvex_guest_offsets.h" |
| 36 | |
| 37 | |
| 38 | /*----------------------------------------------------------------*/ |
| 39 | /* |
| 40 | Perform a syscall for the client. This will run a syscall |
| 41 | with the client's specific per-thread signal mask. |
| 42 | |
| 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 |
| 49 | interactions. |
| 50 | |
| 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. |
| 54 | |
| 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 |
| 58 | failed). |
| 59 | |
| 60 | VG_(fixup_guest_state_after_syscall_interrupted) does the |
| 61 | thread state fixup in the case where we were interrupted by a |
| 62 | signal. |
| 63 | |
| 64 | Prototype: |
| 65 | |
| 66 | Int ML_(do_syscall_for_client_WRK( |
| 67 | Int syscallno, // rdi |
| 68 | void* guest_state, // rsi |
| 69 | const vki_sigset_t *sysmask, // rdx |
| 70 | const vki_sigset_t *postmask, // rcx |
| 71 | Int sigsetSzB) // r8 |
| 72 | |
| 73 | Note that sigsetSzB is totally ignored (and irrelevant). |
| 74 | */ |
| 75 | |
| 76 | /* from vki_arch.h */ |
| 77 | #define VKI_SIG_SETMASK 3 |
| 78 | |
| 79 | /* DO_SYSCALL MACH|MDEP|UNIX */ |
| 80 | #define MACH 1 |
| 81 | #define MDEP 2 |
| 82 | #define UNIX 3 |
| 83 | |
| 84 | .macro DO_SYSCALL |
| 85 | /* save callee-saved regs */ |
| 86 | pushq %rbp |
| 87 | movq %rsp, %rbp |
| 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 |
| 95 | |
| 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 */ |
| 99 | |
| 100 | /* Set the signal mask which should be current during the syscall. */ |
| 101 | /* GrP fixme signals |
| 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 |
| 109 | syscall |
| 110 | |
| 111 | jnc 7f // sigprocmask failed |
| 112 | */ |
| 113 | |
| 114 | /* OK, that worked. Now do the syscall proper. */ |
| 115 | |
| 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 */ |
| 126 | movq 16(%r11), %rax |
| 127 | pushq %rax |
| 128 | movq 8(%r11), %rax |
| 129 | pushq %rax |
| 130 | /* stack is currently aligned - return address misaligns */ |
| 131 | movq 0(%r11), %rax |
| 132 | pushq %rax |
| 133 | /* syscallno */ |
| 134 | movq -8(%rbp), %rax |
| 135 | |
| 136 | /* If rip==2, then the syscall was either just about |
| 137 | to start, or was interrupted and the kernel was |
| 138 | restarting it. */ |
| 139 | L_$0_2: syscall |
| 140 | L_$0_3: /* In the range [3, 4), the syscall result is in %rax, |
| 141 | but hasn't been committed to RAX. */ |
| 142 | |
| 143 | /* stack contents: 3 words for syscall above, plus our prologue */ |
| 144 | setc 0(%rsp) /* stash returned carry flag */ |
| 145 | |
| 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 */ |
| 149 | |
| 150 | .if $0 == UNIX |
| 151 | /* save carry flag to VEX */ |
| 152 | xor %rax, %rax |
| 153 | movb 0(%rsp), %al |
| 154 | movq %rax, %rdi /* arg1 = new flag */ |
| 155 | movq %r11, %rsi /* arg2 = vex state */ |
| 156 | addq $$24, %rsp /* remove syscall parameters */ |
| 157 | call _LibVEX_GuestAMD64_put_rflag_c |
| 158 | .else |
| 159 | addq $$24, %rsp /* remove syscall parameters*/ |
| 160 | .endif |
| 161 | |
| 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. */ |
| 164 | /* GrP fixme signals |
| 165 | DDD: JRS fixme: use __NR___pthread_sigmask, not __NR_rt_sigprocmask |
| 166 | PUSH_di_si_dx_cx_8 |
| 167 | |
| 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 |
| 174 | syscall |
| 175 | |
| 176 | POP_di_si_dx_cx_8 |
| 177 | |
| 178 | jnc 7f // sigprocmask failed |
| 179 | */ |
| 180 | L_$0_5: /* now safe from signals */ |
| 181 | movq $$0, %rax /* SUCCESS */ |
| 182 | movq %rbp, %rsp |
| 183 | popq %rbp |
| 184 | ret |
| 185 | |
| 186 | /* GrP fixme signals |
| 187 | L_$0_7: // failure: return 0x8000 | error code |
| 188 | DDD: fixme return value |
| 189 | movq %rbp, %rsp |
| 190 | popq %rbp |
| 191 | ret |
| 192 | */ |
| 193 | |
| 194 | .endmacro |
| 195 | |
| 196 | |
| 197 | .globl ML_(do_syscall_for_client_unix_WRK) |
| 198 | ML_(do_syscall_for_client_unix_WRK): |
| 199 | DO_SYSCALL UNIX |
| 200 | |
| 201 | .globl ML_(do_syscall_for_client_mach_WRK) |
| 202 | ML_(do_syscall_for_client_mach_WRK): |
| 203 | DO_SYSCALL MACH |
| 204 | |
| 205 | .globl ML_(do_syscall_for_client_mdep_WRK) |
| 206 | ML_(do_syscall_for_client_mdep_WRK): |
| 207 | DO_SYSCALL MDEP |
| 208 | |
| 209 | .data |
| 210 | /* export the ranges so that |
| 211 | VG_(fixup_guest_state_after_syscall_interrupted) can do the |
| 212 | right thing */ |
| 213 | |
| 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) |
| 218 | |
| 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) |
| 229 | |
| 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) |
| 240 | |
| 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) |
| 251 | |
njn | 8b68b64 | 2009-06-24 00:37:09 +0000 | [diff] [blame] | 252 | #endif // defined(VGP_amd64_darwin) |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 253 | |
| 254 | /*--------------------------------------------------------------------*/ |
| 255 | /*--- end ---*/ |
| 256 | /*--------------------------------------------------------------------*/ |