| 1 | #if (defined(__riscv) && (__riscv_xlen == 64)) && defined(__linux__) |
|---|
| 2 | |
|---|
| 3 | #include "sanitizer_common/sanitizer_asm.h" |
|---|
| 4 | |
|---|
| 5 | ASM_HIDDEN(COMMON_INTERCEPTOR_SPILL_AREA) |
|---|
| 6 | |
|---|
| 7 | .comm _ZN14__interception10real_vforkE,8,8 |
|---|
| 8 | .globl ASM_WRAPPER_NAME(vfork) |
|---|
| 9 | ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork)) |
|---|
| 10 | ASM_WRAPPER_NAME(vfork): |
|---|
| 11 | // Save ra in the off-stack spill area. |
|---|
| 12 | // allocate space on stack |
|---|
| 13 | addi sp, sp, -16 |
|---|
| 14 | // store ra value |
|---|
| 15 | sd ra, 8(sp) |
|---|
| 16 | call COMMON_INTERCEPTOR_SPILL_AREA |
|---|
| 17 | // restore previous values from stack |
|---|
| 18 | ld ra, 8(sp) |
|---|
| 19 | // adjust stack |
|---|
| 20 | addi sp, sp, 16 |
|---|
| 21 | // store ra by x10 |
|---|
| 22 | sd ra, 0(x10) |
|---|
| 23 | |
|---|
| 24 | // Call real vfork. This may return twice. User code that runs between the first and the second return |
|---|
| 25 | // may clobber the stack frame of the interceptor; that's why it does not have a frame. |
|---|
| 26 | la x10, _ZN14__interception10real_vforkE |
|---|
| 27 | ld x10, 0(x10) |
|---|
| 28 | jalr x10 |
|---|
| 29 | |
|---|
| 30 | // adjust stack |
|---|
| 31 | addi sp, sp, -16 |
|---|
| 32 | // store x10 by adjusted stack |
|---|
| 33 | sd x10, 8(sp) |
|---|
| 34 | // jump to exit label if x10 is 0 |
|---|
| 35 | beqz x10, .L_exit |
|---|
| 36 | |
|---|
| 37 | // x0 != 0 => parent process. Clear stack shadow. |
|---|
| 38 | // put old sp to x10 |
|---|
| 39 | addi x10, sp, 16 |
|---|
| 40 | call COMMON_INTERCEPTOR_HANDLE_VFORK |
|---|
| 41 | |
|---|
| 42 | .L_exit: |
|---|
| 43 | // Restore ra |
|---|
| 44 | call COMMON_INTERCEPTOR_SPILL_AREA |
|---|
| 45 | ld ra, 0(x10) |
|---|
| 46 | // load value by stack |
|---|
| 47 | ld x10, 8(sp) |
|---|
| 48 | // adjust stack |
|---|
| 49 | addi sp, sp, 16 |
|---|
| 50 | ret |
|---|
| 51 | ASM_SIZE(vfork) |
|---|
| 52 | |
|---|
| 53 | ASM_INTERCEPTOR_TRAMPOLINE(vfork) |
|---|
| 54 | ASM_TRAMPOLINE_ALIAS(vfork, vfork) |
|---|
| 55 | |
|---|
| 56 | #endif |
|---|
| 57 | |
|---|
