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| author | Piotr Jaroszyński | 2010-06-09 20:04:09 +0200 |
|---|---|---|
| committer | Michael Brown | 2010-08-19 13:30:03 +0200 |
| commit | e743910cf9de6db7931b5f1d812c2d0ebec5a4c0 (patch) | |
| tree | 58163c98912d27d4100704ce4b63703b764d26f9 /src/arch/x86_64 | |
| parent | [linux] Add linux api headers (diff) | |
| download | ipxe-e743910cf9de6db7931b5f1d812c2d0ebec5a4c0.tar.gz ipxe-e743910cf9de6db7931b5f1d812c2d0ebec5a4c0.tar.xz ipxe-e743910cf9de6db7931b5f1d812c2d0ebec5a4c0.zip | |
[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>
Diffstat (limited to 'src/arch/x86_64')
| -rw-r--r-- | src/arch/x86_64/core/linux/linux_syscall.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/arch/x86_64/core/linux/linux_syscall.S b/src/arch/x86_64/core/linux/linux_syscall.S new file mode 100644 index 000000000..d2805f94c --- /dev/null +++ b/src/arch/x86_64/core/linux/linux_syscall.S @@ -0,0 +1,33 @@ + + .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 |