# HG changeset patch
# User Taylor R Campbell <riastradh@NetBSD.org>
# Date 1744484170 0
#      Sat Apr 12 18:56:10 2025 +0000
# Branch trunk
# Node ID 7242b013788eb91f5e5af52ae264bbc8fe011fcc
# Parent  04218384223d82cd5e3facb3ebb61bc9184838f0
# EXP-Topic riastradh-pr59285-mips_longjmp0
mips _longjmp(..., 0): Make 1, not 0, come flying out of _setjmp.

PR port-mips/59285: _longjmp(..., 0) makes setjmp return 0, not 1

diff -r 04218384223d -r 7242b013788e lib/libc/arch/mips/gen/_setjmp.S
--- a/lib/libc/arch/mips/gen/_setjmp.S	Sat Apr 12 13:00:21 2025 +0000
+++ b/lib/libc/arch/mips/gen/_setjmp.S	Sat Apr 12 18:56:10 2025 +0000
@@ -122,8 +122,9 @@ LEAF(_longjmp)
 	SAVE_GP(CALLFRAME_GP)
 
 	REG_PROLOGUE
-	REG_L		v0, _SC_REGS(a0)	# get magic number
-	REG_L		ra, _SC_PC(a0)
+	beqz		a1, 2f			# check for longjmp(..., 0)
+	 REG_L		v0, _SC_REGS(a0)	# get magic number
+1:	REG_L		ra, _SC_PC(a0)
 	REG_LI		t0, 0xACEDBADE
 	bne		v0, t0, botch		# jump if error
 	PTR_ADDU	sp, sp, CALLFRAME_SIZ	# does not matter, sanity
@@ -178,6 +179,12 @@ LEAF(_longjmp)
 	j	ra
 	 move	v0, a1			# get return value in 1st arg
 
+2:	/*
+	 * Map _longjmp(..., 0) to _longjmp(..., 1).
+	 */
+	j	1b
+	 li	a1, 1
+
 botch:
 	/*
 	 * We know we aren't returning so we don't care about restoring