5288fee835
The spec says "A value in the range between -4095 to -1 indicates an error" (not -129). This was pointed out in the comment in 22039. Change-Id: I11b7c45015a9e4ccf09aed5364a889437eab6ab8 Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
46 lines
850 B
ArmAsm
46 lines
850 B
ArmAsm
/*
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* Generic syscall call.
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* Upon entry
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* %eax: system call number
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* %ebx: arg0 to system call
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* %ecx: arg..
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* %edx: arg..
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* %esi: arg..
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* %edi: arg..
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* We push these (to save them) load them up with the
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* values from the calling frame (not all will actually be valid)
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* and make the syscall.
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*/
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#include <sys/linux-syscalls.h>
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.text
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.type syscall, @function
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.globl syscall
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.align 4
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syscall:
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push %ebx
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push %esi
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push %edi
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mov 16(%esp),%eax
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mov 20(%esp),%ebx
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mov 24(%esp),%ecx
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mov 28(%esp),%edx
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mov 32(%esp),%esi
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mov 36(%esp),%edi
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int $0x80
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cmpl $-4095, %eax
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jb 1f
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negl %eax
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pushl %eax
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call __set_errno
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addl $4, %esp
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orl $-1, %eax
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1:
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pop %edi
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pop %esi
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pop %ebx
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ret
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