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ARM64: External unwinder already restores non-volatile registers.

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Thanks to Peter Cawley. #593
This commit is contained in:
Mike Pall 2023-09-15 05:27:29 +02:00
parent b36f9fad63
commit 18b8fd8de7
1 changed files with 4 additions and 4 deletions
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8
src/vm_arm64.dasc
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@ -432,24 +432,24 @@ static void build_subroutines(BuildCtx *ctx)
| // (void *cframe, int errcode) | // (void *cframe, int errcode)
| mov sp, CARG1 | mov sp, CARG1
| mov CRET1, CARG2 | mov CRET1, CARG2
|->vm_unwind_c_eh: // Landing pad for external unwinder.
| ldr L, SAVE_L | ldr L, SAVE_L
| mv_vmstate TMP0w, C
| ldr GL, L->glref | ldr GL, L->glref
|->vm_unwind_c_eh: // Landing pad for external unwinder.
| mv_vmstate TMP0w, C
| st_vmstate TMP0w | st_vmstate TMP0w
| b ->vm_leave_unw | b ->vm_leave_unw
| |
|->vm_unwind_ff: // Unwind C stack, return from ff pcall. |->vm_unwind_ff: // Unwind C stack, return from ff pcall.
| // (void *cframe) | // (void *cframe)
| and sp, CARG1, #CFRAME_RAWMASK | and sp, CARG1, #CFRAME_RAWMASK
|->vm_unwind_ff_eh: // Landing pad for external unwinder.
| ldr L, SAVE_L | ldr L, SAVE_L
| movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48 | movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48
| movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16 | movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16
| movn TISNIL, #0 | movn TISNIL, #0
| ldr GL, L->glref // Setup pointer to global state.
|->vm_unwind_ff_eh: // Landing pad for external unwinder.
| mov RC, #16 // 2 results: false + error message. | mov RC, #16 // 2 results: false + error message.
| ldr BASE, L->base | ldr BASE, L->base
| ldr GL, L->glref // Setup pointer to global state.
| mov_false TMP0 | mov_false TMP0
| sub RA, BASE, #8 // Results start at BASE-8. | sub RA, BASE, #8 // Results start at BASE-8.
| ldr PC, [BASE, FRAME_PC] // Fetch PC of previous frame. | ldr PC, [BASE, FRAME_PC] // Fetch PC of previous frame.