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MIPS: Fix __builtin_longjmp (PR 64242)

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The problem here is mips has its own builtin_longjmp
pattern and it was not fixed when expand_builtin_longjmp
was fixed.  We need to read the new fp and gp before
restoring the stack as the buffer might be a local
variable.

2020-08-25  Andrew Pinski  <apinski@marvell.com>

gcc/ChangeLog:

	PR middle-end/64242
	* config/mips/mips.md (builtin_longjmp): Restore the frame
	pointer and stack pointer and gp.
This commit is contained in:
Andrew Pinski 2020-08-25 14:17:52 +08:00 committed by Chenghua Xu
parent 7fe2cec41b
commit 68e605c93d
1 changed files with 11 additions and 1 deletions
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12
gcc/config/mips/mips.md
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@ -6562,9 +6562,19 @@
/* This bit is similar to expand_builtin_longjmp except that it
restores $gp as well. */
mips_emit_move (hard_frame_pointer_rtx, fp);
mips_emit_move (pv, lab);
/* Restore the frame pointer and stack pointer and gp. We must use a
temporary since the setjmp buffer may be a local. */
fp = copy_to_reg (fp);
gpv = copy_to_reg (gpv);
emit_stack_restore (SAVE_NONLOCAL, stack);
/* Ensure the frame pointer move is not optimized. */
emit_insn (gen_blockage ());
emit_clobber (hard_frame_pointer_rtx);
emit_clobber (frame_pointer_rtx);
emit_clobber (gp);
mips_emit_move (hard_frame_pointer_rtx, fp);
mips_emit_move (gp, gpv);
emit_use (hard_frame_pointer_rtx);
emit_use (stack_pointer_rtx);