| #if defined(__aarch64__) && defined(__linux__) |
| |
| #include "sanitizer_common/sanitizer_asm.h" |
| #include "builtins/assembly.h" |
| |
| ASM_HIDDEN(COMMON_INTERCEPTOR_SPILL_AREA) |
| |
| .comm _ZN14__interception10real_vforkE,8,8 |
| .globl ASM_WRAPPER_NAME(vfork) |
| ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork)) |
| ASM_WRAPPER_NAME(vfork): |
| // Save x30 in the off-stack spill area. |
| hint #25 // paciasp |
| stp xzr, x30, [sp, #-16]! |
| bl COMMON_INTERCEPTOR_SPILL_AREA |
| ldp xzr, x30, [sp], 16 |
| str x30, [x0] |
| |
| // Call real vfork. This may return twice. User code that runs between the first and the second return |
| // may clobber the stack frame of the interceptor; that's why it does not have a frame. |
| adrp x0, _ZN14__interception10real_vforkE |
| ldr x0, [x0, :lo12:_ZN14__interception10real_vforkE] |
| blr x0 |
| |
| stp x0, xzr, [sp, #-16]! |
| cmp x0, #0 |
| b.eq .L_exit |
| |
| // x0 != 0 => parent process. Clear stack shadow. |
| add x0, sp, #16 |
| bl COMMON_INTERCEPTOR_HANDLE_VFORK |
| |
| .L_exit: |
| // Restore x30. |
| bl COMMON_INTERCEPTOR_SPILL_AREA |
| ldr x30, [x0] |
| ldp x0, xzr, [sp], 16 |
| hint #29 // autiasp |
| |
| ret |
| ASM_SIZE(vfork) |
| |
| .weak vfork |
| .set vfork, ASM_WRAPPER_NAME(vfork) |
| |
| GNU_PROPERTY_BTI_PAC |
| |
| #endif |
