Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / i386 / core / linux / linux_syscall.S

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 (file)
index 0000000..38a3e74
--- /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