diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/core/linux/linux_syscall.S')
| -rw-r--r-- | qemu/roms/ipxe/src/arch/i386/core/linux/linux_syscall.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/core/linux/linux_syscall.S b/qemu/roms/ipxe/src/arch/i386/core/linux/linux_syscall.S new file mode 100644 index 000000000..38a3e74bd --- /dev/null +++ b/qemu/roms/ipxe/src/arch/i386/core/linux/linux_syscall.S @@ -0,0 +1,45 @@ + + .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 |