| 1 | #if defined(__aarch64__) && defined(__linux__) |
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| 2 | |
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| 3 | #include "sanitizer_common/sanitizer_asm.h" |
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| 4 | #include "builtins/assembly.h" |
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| 5 | |
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| 6 | ASM_HIDDEN(COMMON_INTERCEPTOR_SPILL_AREA) |
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| 7 | |
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| 8 | .comm _ZN14__interception10real_vforkE,8,8 |
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| 9 | .globl ASM_WRAPPER_NAME(vfork) |
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| 10 | ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork)) |
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| 11 | ASM_WRAPPER_NAME(vfork): |
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| 12 | // Save x30 in the off-stack spill area. |
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| 13 | hint #25 // paciasp |
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| 14 | stp xzr, x30, [sp, #-16]! |
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| 15 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 16 | ldp xzr, x30, [sp], 16 |
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| 17 | str x30, [x0] |
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| 18 | |
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| 19 | // Call real vfork. This may return twice. User code that runs between the first and the second return |
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| 20 | // may clobber the stack frame of the interceptor; that's why it does not have a frame. |
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| 21 | adrp x0, _ZN14__interception10real_vforkE |
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| 22 | ldr x0, [x0, :lo12:_ZN14__interception10real_vforkE] |
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| 23 | blr x0 |
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| 24 | |
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| 25 | stp x0, xzr, [sp, #-16]! |
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| 26 | cmp x0, #0 |
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| 27 | b.eq .L_exit |
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| 28 | |
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| 29 | // x0 != 0 => parent process. Clear stack shadow. |
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| 30 | add x0, sp, #16 |
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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 x30. |
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| 35 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 36 | ldr x30, [x0] |
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| 37 | ldp x0, xzr, [sp], 16 |
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| 38 | hint #29 // autiasp |
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| 39 | |
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| 40 | ret |
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| 41 | ASM_SIZE(vfork) |
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| 42 | |
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| 43 | ASM_INTERCEPTOR_TRAMPOLINE(vfork) |
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| 44 | ASM_TRAMPOLINE_ALIAS(vfork, vfork) |
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| 45 | |
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| 46 | GNU_PROPERTY_BTI_PAC |
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| 47 | |
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| 48 | #endif |
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| 49 | |
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