mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 03:22:43 +00:00
49749e279a
These are aliases to `setjmp()` and `longjmp()` on our system, as our implementations don't modify the signal mask. This is required for the syzkaller executor process.
86 lines
2 KiB
ArmAsm
86 lines
2 KiB
ArmAsm
/*
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* Copyright (c) 2018-2020, 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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.Lget_pc:
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mov (%esp), %ebx
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ret
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.global _setjmp
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.global setjmp
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_setjmp:
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setjmp:
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xor %eax, %eax // Grab val argument (hardcoded to zero)
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jmp .Lsigset_common
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.global sigsetjmp
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sigsetjmp:
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mov 8(%esp), %eax // Grab val argument
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.Lsigset_common:
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mov 4(%esp), %ecx // Grab jmp_buf argument
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mov %eax, 24(%ecx) // Store val into did_save_signal_mask
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movl $0, 28(%ecx) // Clear saved_signal_mask
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test %eax, %eax
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jz .Lsaveregs
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push %ebp // Prepare ABI-compliant call to sigprocmask
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mov %esp, %ebp
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push %ebx
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call .Lget_pc // Grab the GOT pointer
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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lea 28(%ecx), %eax // Set argument oldset
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push %eax
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push $0 // Set argument set
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push $0 // Set argument how
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call sigprocmask@plt
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add $12, %esp
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pop %ebx
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pop %ebp
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.Lsaveregs:
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mov 4(%esp), %ecx // Grab jmp_buf argument
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mov (%esp), %edx // Grab return address
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mov %ebx, (0 * 4)(%ecx) // Save registers
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mov %esi, (1 * 4)(%ecx)
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mov %edi, (2 * 4)(%ecx)
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mov %ebp, (3 * 4)(%ecx)
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mov %esp, (4 * 4)(%ecx)
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mov %edx, (5 * 4)(%ecx)
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xor %eax, %eax
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ret
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.global _longjmp
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.global longjmp
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_longjmp:
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longjmp:
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mov 4(%esp), %ecx // Grab jmp_buf argument
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mov 8(%esp), %eax // Grab val argument
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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 * 4)(%ecx), %ebx // Restore registers
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mov (1 * 4)(%ecx), %esi
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mov (2 * 4)(%ecx), %edi
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mov (3 * 4)(%ecx), %ebp
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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 (4 * 4)(%ecx), %esp
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mov (5 * 4)(%ecx), %edx
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mov %edx, (%esp) // 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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