mirror of
https://github.com/RGBCube/serenity
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70 lines
1.6 KiB
ArmAsm
70 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <bits/sighow.h>
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//
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// /!\ Read setjmp.h before modifying this file!
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//
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.global setjmp
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setjmp:
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mov $0, %esi // Set val argument to 0
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.global sigsetjmp
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sigsetjmp:
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mov %esi, 64(%rdi) // Store val into did_save_signal_mask
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movl $0, 68(%rdi) // Clear saved_signal_mask
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test %esi, %esi
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jz .Lsaveregs
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push %rbp // Prepare ABI-compliant call to sigprocmask
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mov %rsp, %rbp
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push %rdi
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lea 68(%rdi), %rdx // Set argument oldset
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mov $0, %rsi // Set argument set
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mov $0, %rdi // Set argument how
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call sigprocmask@plt
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pop %rdi
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pop %rbp
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.Lsaveregs:
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mov %rbx, (0 * 8)(%rdi) // Save registers
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mov %r12, (1 * 8)(%rdi)
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mov %r13, (2 * 8)(%rdi)
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mov %r14, (3 * 8)(%rdi)
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mov %r15, (4 * 8)(%rdi)
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mov %rbp, (5 * 8)(%rdi)
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mov %rsp, (6 * 8)(%rdi)
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mov (%rsp), %rax // Grab return address
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mov %rax, (7 * 8)(%rdi)
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xor %eax, %eax
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ret
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.global longjmp
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longjmp:
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mov %esi, %eax
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test %eax, %eax
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jnz .Lnonzero
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mov $1, %eax
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.Lnonzero:
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mov (0 * 8)(%rdi), %rbx // Restore registers
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mov (1 * 8)(%rdi), %r12
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mov (2 * 8)(%rdi), %r13
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mov (3 * 8)(%rdi), %r14
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mov (4 * 8)(%rdi), %r15
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mov (5 * 8)(%rdi), %rbp
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//
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// Until this point, the stack is still from the caller.
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//
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mov (6 * 8)(%rdi), %rsp
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mov (7 * 8)(%rdi), %rcx
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mov %rcx, (%rsp) // Patch return address
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//
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// From this point on, the former stack has been restored.
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//
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ret
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