mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-25 19:07:46 +00:00
07bf731e4b
Change syscall-stub's data to include a "expected retval". Stub now checks syscalls retval and aborts execution of syscall list, if retval != expected retval. run_syscall_stub prints the data of the failed syscall, using the data pointer and retval written by the stub to the beginning of the stack. one_syscall_stub is removed, to simplify code, because only some instructions are saved by one_syscall_stub, no host-syscall. Using the stub with additional data (modify_ldt via stub) is prepared also. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
52 lines
808 B
ArmAsm
52 lines
808 B
ArmAsm
#include "uml-config.h"
|
|
|
|
.globl syscall_stub
|
|
.section .__syscall_stub, "x"
|
|
|
|
.globl batch_syscall_stub
|
|
batch_syscall_stub:
|
|
/* load pointer to first operation */
|
|
mov $(UML_CONFIG_STUB_DATA+8), %esp
|
|
|
|
again:
|
|
/* load length of additional data */
|
|
mov 0x0(%esp), %eax
|
|
|
|
/* if(length == 0) : end of list */
|
|
/* write possible 0 to header */
|
|
mov %eax, UML_CONFIG_STUB_DATA+4
|
|
cmpl $0, %eax
|
|
jz done
|
|
|
|
/* save current pointer */
|
|
mov %esp, UML_CONFIG_STUB_DATA+4
|
|
|
|
/* skip additional data */
|
|
add %eax, %esp
|
|
|
|
/* load syscall-# */
|
|
pop %eax
|
|
|
|
/* load syscall params */
|
|
pop %ebx
|
|
pop %ecx
|
|
pop %edx
|
|
pop %esi
|
|
pop %edi
|
|
pop %ebp
|
|
|
|
/* execute syscall */
|
|
int $0x80
|
|
|
|
/* check return value */
|
|
pop %ebx
|
|
cmp %ebx, %eax
|
|
je again
|
|
|
|
done:
|
|
/* save return value */
|
|
mov %eax, UML_CONFIG_STUB_DATA
|
|
|
|
/* stop */
|
|
int3
|