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