| 1 | #if defined(__arm__) && defined(__linux__) |
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| 2 | |
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| 3 | #include "sanitizer_common/sanitizer_asm.h" |
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| 4 | |
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| 5 | ASM_HIDDEN(COMMON_INTERCEPTOR_SPILL_AREA) |
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| 6 | |
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| 7 | .comm _ZN14__interception10real_vforkE,4,4 |
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| 8 | .globl ASM_WRAPPER_NAME(vfork) |
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| 9 | ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork)) |
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| 10 | ASM_WRAPPER_NAME(vfork): |
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| 11 | // Save LR in the off-stack spill area. |
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| 12 | push {r4, lr} |
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| 13 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 14 | pop {r4, lr} |
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| 15 | str lr, [r0] |
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| 16 | |
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| 17 | // Call real vfork. This may return twice. User code that runs between the first and the second return |
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| 18 | // may clobber the stack frame of the interceptor; that's why it does not have a frame. |
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| 19 | ldr r0, .LCPI0_0 |
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| 20 | .LPC0_0: |
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| 21 | ldr r0, [pc, r0] |
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| 22 | mov lr, pc |
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| 23 | bx r0 |
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| 24 | |
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| 25 | push {r0, r4} |
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| 26 | cmp r0, #0 |
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| 27 | beq .L_exit |
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| 28 | |
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| 29 | // r0 != 0 => parent process. Clear stack shadow. |
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| 30 | add r0, sp, #8 |
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| 31 | bl COMMON_INTERCEPTOR_HANDLE_VFORK |
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| 32 | |
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| 33 | .L_exit: |
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| 34 | // Restore LR. |
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| 35 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 36 | ldr lr, [r0] |
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| 37 | pop {r0, r4} |
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| 38 | |
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| 39 | mov pc, lr |
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| 40 | |
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| 41 | .LCPI0_0: |
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| 42 | .long _ZN14__interception10real_vforkE - (.LPC0_0+8) |
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| 43 | |
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| 44 | ASM_SIZE(vfork) |
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| 45 | |
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| 46 | ASM_INTERCEPTOR_TRAMPOLINE(vfork) |
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| 47 | ASM_TRAMPOLINE_ALIAS(vfork, vfork) |
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| 48 | |
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| 49 | #endif |
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| 50 | |
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