petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
| 3 | /*--- Support for doing system calls. syscall-mips64-linux.S ---*/ |
| 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
| 7 | This file is part of Valgrind, a dynamic binary instrumentation |
| 8 | framework. |
| 9 | |
Elliott Hughes | ed39800 | 2017-06-21 14:41:24 -0700 | [diff] [blame^] | 10 | Copyright (C) 2010-2017 RT-RK |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 11 | mips-valgrind@rt-rk.com |
| 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 | |
florian | 3f1d613 | 2015-09-30 20:30:48 +0000 | [diff] [blame] | 31 | #include "pub_core_basics_asm.h" |
| 32 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 33 | #if defined(VGP_mips64_linux) |
| 34 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 35 | #include "pub_core_vkiscnums_asm.h" |
| 36 | #include "libvex_guest_offsets.h" |
| 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 PC 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 regs->v0. The syscall result is written |
| 53 | back to regs->v0 on completion. |
| 54 | |
| 55 | VG_(fixup_guest_state_after_syscall_interrupted) does the |
| 56 | thread state fixup in the case where we were interrupted by a |
| 57 | signal. |
| 58 | |
| 59 | Prototype: |
| 60 | |
| 61 | UWord ML_(do_syscall_for_client_WRK)( |
| 62 | Int syscallno, // $4 - a0 |
| 63 | void* guest_state, // $5 - a1 |
| 64 | const vki_sigset_t *sysmask, // $6 - a2 |
| 65 | const vki_sigset_t *postmask, // $7 - a3 |
| 66 | Int nsigwords) // $8 - a4 |
| 67 | */ |
| 68 | |
| 69 | /* from vki_arch.h */ |
| 70 | #define VKI_SIG_SETMASK 3 |
| 71 | |
| 72 | .globl ML_(do_syscall_for_client_WRK) |
| 73 | ML_(do_syscall_for_client_WRK): |
| 74 | |
| 75 | /* save regs $a0 - $a4 on stack */ |
| 76 | daddiu $29, $29, -48 |
| 77 | sd $4, 0($29) /* syscallno */ |
| 78 | sd $5, 8($29) /* guest_state */ |
| 79 | sd $6, 16($29) /* sysmask */ |
| 80 | sd $7, 24($29) /* postmask */ |
| 81 | sd $8, 32($29) /* nsigwords */ |
| 82 | |
| 83 | 1: li $2, __NR_rt_sigprocmask |
| 84 | li $4, VKI_SIG_SETMASK |
| 85 | move $5, $6 /* sysmask */ |
| 86 | move $6, $7 /* postmask */ |
| 87 | move $7, $8 /* nsigwords */ |
| 88 | syscall |
| 89 | |
| 90 | bnez $7, 7f |
| 91 | nop |
| 92 | |
| 93 | /* Actually do the client syscall */ |
| 94 | ld $5, 8($29) /* guest_state */ |
| 95 | ld $4, OFFSET_mips64_r4($5) /* a0 */ |
| 96 | |
| 97 | ld $6, OFFSET_mips64_r6($5) /* a2 */ |
| 98 | ld $7, OFFSET_mips64_r7($5) /* a3 */ |
| 99 | ld $8, OFFSET_mips64_r8($5) /* a4 */ |
| 100 | ld $9, OFFSET_mips64_r9($5) /* a5 */ |
| 101 | |
| 102 | ld $5, OFFSET_mips64_r5($5) /* a1 */ |
| 103 | ld $2, 0($29) /* syscallno */ |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 104 | |
petarj | 863014b | 2013-04-26 19:01:04 +0000 | [diff] [blame] | 105 | 2: syscall |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 106 | |
| 107 | /* Saving return values into Guest state */ |
| 108 | 3: ld $5, 8($29) /* guest_state */ |
| 109 | sd $2, OFFSET_mips64_r2($5) /* v0 */ |
| 110 | sd $7, OFFSET_mips64_r7($5) /* a3 */ |
| 111 | |
| 112 | 4: li $2, __NR_rt_sigprocmask |
| 113 | li $4, VKI_SIG_SETMASK |
| 114 | ld $5, 24($29) /* postmask */ |
| 115 | move $6, $0 /* 0 (zero) */ |
| 116 | ld $7, 32($29) /* nsigwords */ |
| 117 | syscall |
| 118 | |
| 119 | bnez $7, 7f |
| 120 | nop |
| 121 | |
| 122 | 5: /* restore 29 and return */ |
| 123 | daddiu $29, $29, 48 |
| 124 | jr $31 |
| 125 | nop |
| 126 | |
| 127 | 7: /* error */ |
| 128 | daddiu $29, $29, 48 |
| 129 | li $2, 0x8000 |
| 130 | jr $31 |
| 131 | nop |
| 132 | |
| 133 | .section .rodata |
| 134 | /* export the ranges so that |
| 135 | VG_(fixup_guest_state_after_syscall_interrupted) can do the |
| 136 | right thing */ |
| 137 | |
| 138 | .globl ML_(blksys_setup) |
| 139 | .globl ML_(blksys_restart) |
| 140 | .globl ML_(blksys_complete) |
| 141 | .globl ML_(blksys_committed) |
| 142 | .globl ML_(blksys_finished) |
| 143 | ML_(blksys_setup): .quad 1b |
| 144 | ML_(blksys_restart): .quad 2b |
| 145 | ML_(blksys_complete): .quad 3b |
| 146 | ML_(blksys_committed): .quad 4b |
| 147 | ML_(blksys_finished): .quad 5b |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 148 | |
| 149 | #endif // defined(VGP_mips64_linux) |
| 150 | |
florian | 3f1d613 | 2015-09-30 20:30:48 +0000 | [diff] [blame] | 151 | /* Let the linker know we don't need an executable stack */ |
| 152 | MARK_STACK_NO_EXEC |
| 153 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 154 | /*--------------------------------------------------------------------*/ |
| 155 | /*--- end ---*/ |
| 156 | /*--------------------------------------------------------------------*/ |