mirror of https://github.com/topjohnwu/Magisk
67 lines
1.5 KiB
ArmAsm
67 lines
1.5 KiB
ArmAsm
/*
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* Generic syscall call.
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* Upon entry:
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* %eax: system call number - caller save
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* %ebx: arg0 to system call - callee save
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* %ecx: arg1 - caller save
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* %edx: arg2 - caller save
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* %esi: arg3 - callee save
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* %edi: arg4 - callee save
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* %ebp: arg5 - callee save
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*/
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#include "private/bionic_asm.h"
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ENTRY(syscall)
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# Push the callee save registers.
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push %ebx
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset ebx, 0
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push %esi
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset esi, 0
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push %edi
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset edi, 0
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push %ebp
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset ebp, 0
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# Load all the arguments from the calling frame.
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# (Not all will be valid, depending on the syscall.)
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mov 20(%esp),%eax
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mov 24(%esp),%ebx
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mov 28(%esp),%ecx
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mov 32(%esp),%edx
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mov 36(%esp),%esi
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mov 40(%esp),%edi
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mov 44(%esp),%ebp
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# Make the system call.
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int $0x80
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# Error?
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cmpl $-MAX_ERRNO, %eax
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jb 1f
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# Yes, so set errno.
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negl %eax
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pushl %eax
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call __set_errno_internal
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addl $4, %esp
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1:
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# Restore the callee save registers.
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pop %ebp
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.cfi_adjust_cfa_offset -4
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.cfi_restore ebp
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pop %edi
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.cfi_adjust_cfa_offset -4
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.cfi_restore edi
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pop %esi
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.cfi_adjust_cfa_offset -4
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.cfi_restore esi
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pop %ebx
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.cfi_adjust_cfa_offset -4
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.cfi_restore ebx
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ret
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END(syscall)
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