mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
97 lines
2.4 KiB
ArmAsm
97 lines
2.4 KiB
ArmAsm
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x64/setjmp.S
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* Implement the assembly part of setjmp.
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*/
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#define SIG_SETMASK 2
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/*
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* sigjmp_buf[0] = %rbx
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* sigjmp_buf[1] = %rsp
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* sigjmp_buf[2] = %rbp
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* sigjmp_buf[3] = %r12
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* sigjmp_buf[4] = %r13
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* sigjmp_buf[5] = %r14
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* sigjmp_buf[6] = %r15
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* sigjmp_buf[7] = <return-address>
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* sigjmp_buf[8] = <non-zero if sigmask saved>
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* sigjmp_buf[9...] = <saved sigmask if sigjmp_buf[8] != 0>
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*/
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.global setjmp
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.type setjmp, @function
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setjmp:
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movl $1, %esi # setjmp saves the signal mask on Sortix
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jmp 1f
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.size setjmp, . - setjmp
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.global sigsetjmp
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.type sigsetjmp, @function
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sigsetjmp:
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mov %esi, %esi # clear upper 32-bit bits
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testl %esi, %esi
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jz 2f
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1: push %rdi
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push %rsi
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lea (9 * 8)(%rdi), %rdx # oldset
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xor %esi, %esi # set
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xor %edi, %edi # how (ignored because set is NULL)
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mov $sigprocmask, %rax # assumes sigprocmask is per-thread on Sortix
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int $0x90
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pop %rsi
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pop %rdi
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2: mov %rbx, (0 * 8)(%rdi)
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mov %rsp, %rdx
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add $8, %rdx
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mov %rdx, (1 * 8)(%rdi)
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mov %rbp, (2 * 8)(%rdi)
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mov %r12, (3 * 8)(%rdi)
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mov %r13, (4 * 8)(%rdi)
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mov %r14, (5 * 8)(%rdi)
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mov %r15, (6 * 8)(%rdi)
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mov %rsi, (8 * 8)(%rdi)
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int $0x94
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xorl %eax, %eax
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int $0x91
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.size sigsetjmp, . - sigsetjmp
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.global longjmp
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.type longjmp, @function
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longjmp:
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jmp siglongjmp
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.size longjmp, . - longjmp
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.global siglongjmp
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.type siglongjmp, @function
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siglongjmp:
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testl %esi, %esi
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jnz 1f
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movl $1, %esi
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1: movq (8 * 8)(%rdi), %rdx
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testq %rdx, %rdx
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jz 2f
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pushq %rdi
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pushq %rsi
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leaq (9 * 8)(%rdi), %rsi # set
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movl $SIG_SETMASK, %edi # how
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xorl %edx, %edx # oldset
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mov $sigprocmask, %rax
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int $0x90
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popq %rsi
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popq %rdi
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2: int $0x95
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.size siglongjmp, . - siglongjmp
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