diff --git a/libc/Android.mk b/libc/Android.mk index bafc1181c..9013e9a72 100644 --- a/libc/Android.mk +++ b/libc/Android.mk @@ -329,6 +329,7 @@ libc_common_src_files += \ arch-x86/bionic/setjmp.S \ arch-x86/bionic/_setjmp.S \ arch-x86/bionic/vfork.S \ + arch-x86/bionic/syscall.S \ arch-x86/string/bzero.S \ arch-x86/string/memset.S \ arch-x86/string/memcmp.S \ diff --git a/libc/arch-x86/bionic/syscall.S b/libc/arch-x86/bionic/syscall.S new file mode 100644 index 000000000..71abe6b3f --- /dev/null +++ b/libc/arch-x86/bionic/syscall.S @@ -0,0 +1,52 @@ +/* + * Generic syscall call. + * Upon entry + * %eax: system call number + * %ebx: arg0 to system call + * %ecx: arg.. + * %edx: arg.. + * %esi: arg.. + * %edi: arg.. + * We push these (to save them) load them up with the + * values from the calling frame (not all will actually be valid) + * and make the syscall. + */ + +#include + + .text + .type syscall, @function + .globl syscall + .align 4 + +syscall: + push %eax + push %ebx + push %ecx + push %edx + push %esi + push %edi + mov 28(%esp),%eax + mov 32(%esp),%ebx + mov 36(%esp),%ecx + mov 40(%esp),%edx + mov 44(%esp),%esi + mov 48(%esp),%edi + + int $0x80 + + cmpl $-129, %eax + jb 1f + negl %eax + pushl %eax + call __set_errno + addl $4, %esp + orl $-1, %eax +1: + pop %edi + pop %esi + pop %edx + pop %ecx + pop %ebx + pop %eax + ret