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[linux] Add linux_syscall

Add linux_syscall for both i386 and x86_64.

Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Piotr Jaroszyński 2010-06-09 20:04:09 +02:00 committed by Michael Brown
parent 0e5fc47a25
commit e743910cf9
2 changed files with 78 additions and 0 deletions

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.section ".data"
.globl linux_errno
linux_errno: .int 0
.section ".text"
.code32
.globl linux_syscall
.type linux_syscall, @function
linux_syscall:
/* Save registers */
pushl %ebx
pushl %esi
pushl %edi
pushl %ebp
movl 20(%esp), %eax // C arg1 -> syscall number
movl 24(%esp), %ebx // C arg2 -> syscall arg1
movl 28(%esp), %ecx // C arg3 -> syscall arg2
movl 32(%esp), %edx // C arg4 -> syscall arg3
movl 36(%esp), %esi // C arg5 -> syscall arg4
movl 40(%esp), %edi // C arg6 -> syscall arg5
movl 44(%esp), %ebp // C arg7 -> syscall arg6
int $0x80
/* Restore registers */
popl %ebp
popl %edi
popl %esi
popl %ebx
cmpl $-4095, %eax
jae 1f
ret
1:
negl %eax
movl %eax, linux_errno
movl $-1, %eax
ret
.size linux_syscall, . - linux_syscall

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.section ".data"
.globl linux_errno
linux_errno: .int 0
.section ".text"
.code64
.globl linux_syscall
.type linux_syscall, @function
linux_syscall:
movq %rdi, %rax // C arg1 -> syscall number
movq %rsi, %rdi // C arg2 -> syscall arg1
movq %rdx, %rsi // C arg3 -> syscall arg2
movq %rcx, %rdx // C arg4 -> syscall arg3
movq %r8, %r10 // C arg5 -> syscall arg4
movq %r9, %r8 // C arg6 -> syscall arg5
movq 8(%rsp), %r9 // C arg7 -> syscall arg6
syscall
cmpq $-4095, %rax
jae 1f
ret
1:
negq %rax
movl %eax, linux_errno
movq $-1, %rax
ret
.size linux_syscall, . - linux_syscall