| 1 | #if defined(__loongarch_lp64) && 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 | ASM_HIDDEN(_ZN14__interception10real_vforkE) |
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| 7 | |
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| 8 | .text |
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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 ra in the off-stack spill area. |
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| 13 | // allocate space on stack |
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| 14 | addi.d $sp, $sp, -16 |
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| 15 | // store $ra value |
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| 16 | st.d $ra, $sp, 8 |
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| 17 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 18 | // restore previous values from stack |
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| 19 | ld.d $ra, $sp, 8 |
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| 20 | // adjust stack |
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| 21 | addi.d $sp, $sp, 16 |
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| 22 | // store $ra by $a0 |
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| 23 | st.d $ra, $a0, 0 |
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| 24 | |
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| 25 | // Call real vfork. This may return twice. User code that runs between the first and the second return |
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| 26 | // may clobber the stack frame of the interceptor; that's why it does not have a frame. |
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| 27 | la.local $a0, _ZN14__interception10real_vforkE |
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| 28 | ld.d $a0, $a0, 0 |
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| 29 | jirl $ra, $a0, 0 |
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| 30 | |
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| 31 | // adjust stack |
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| 32 | addi.d $sp, $sp, -16 |
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| 33 | // store $a0 by adjusted stack |
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| 34 | st.d $a0, $sp, 8 |
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| 35 | // jump to exit label if $a0 is 0 |
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| 36 | beqz $a0, .L_exit |
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| 37 | |
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| 38 | // $a0 != 0 => parent process. Clear stack shadow. |
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| 39 | // put old $sp to $a0 |
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| 40 | addi.d $a0, $sp, 16 |
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| 41 | bl %plt(COMMON_INTERCEPTOR_HANDLE_VFORK) |
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| 42 | |
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| 43 | .L_exit: |
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| 44 | // Restore $ra |
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| 45 | bl COMMON_INTERCEPTOR_SPILL_AREA |
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| 46 | ld.d $ra, $a0, 0 |
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| 47 | // load value by stack |
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| 48 | ld.d $a0, $sp, 8 |
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| 49 | // adjust stack |
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| 50 | addi.d $sp, $sp, 16 |
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| 51 | jr $ra |
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| 52 | ASM_SIZE(vfork) |
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| 53 | |
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| 54 | ASM_INTERCEPTOR_TRAMPOLINE(vfork) |
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| 55 | ASM_TRAMPOLINE_ALIAS(vfork, vfork) |
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| 56 | |
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| 57 | #endif |
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| 58 | |
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