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-rw-r--r--libc/sysdeps/linux/nds32/__longjmp.S90
1 files changed, 90 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nds32/__longjmp.S b/libc/sysdeps/linux/nds32/__longjmp.S
new file mode 100644
index 000000000..fbea6f6f4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/__longjmp.S
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ setjmp/longjmp for nds32.
+ r0 - r5 are for paramter passing - no need to save
+ r6 - r14 are callee saved - needs to save
+ r15 is temp register for assembler - no need to save
+ r16 - r25 are caller saved - no need to save
+ r26 - r27 are temp registers for OS - no need to save
+ r28 is fp - need to save
+ r29 is gp - need to save
+ r30 is ra - need to save
+ r31 is sp - need to save
+ so we need to save r6 - r14 and r28 - r31
+ The jmpbuf looks like this:
+ r6
+ r7
+ r8
+ r9
+ r10
+ r11
+ r12
+ r13
+ r14
+ fp
+ gp
+ ra
+ sp
+#ifdef NDS32_ABI_2FP_PLUS
+ ($fpcfg.freg)
+ (callee-saved FPU regs)
+#endif
+ reserved(for 8-byte align if needed)
+*/
+
+#include <sysdep.h>
+#define _SETJMP_H
+#define _ASM
+#include <bits/setjmp.h>
+ .section .text
+
+/* __longjmp (env[0].__jmpbuf, val ?: 1); */
+ENTRY(__longjmp)
+ ! restore registers
+ lmw.bim $r6, [$r0], $r14, #0xf
+
+#ifdef NDS32_ABI_2FP_PLUS
+ lwi.bi $r20, [$r0], #4 /* Load $fpcfg.freg to $r20. */
+
+ /* Case switch for $r20 as $fpcfg.freg. */
+ beqz $r20, .LCFG0 /* Branch if $fpcfg.freg = 0b00. */
+ xori $r15, $r20, #0b10
+ beqz $r15, .LCFG2 /* Branch if $fpcfg.freg = 0b10. */
+ srli $r20, $r20, #0b01
+ beqz $r20, .LCFG1 /* Branch if $fpcfg.freg = 0b01. */
+ /* Fall-through if $fpcfg.freg = 0b11. */
+.LCFG3:
+ fldi.bi $fd31, [$r0], #8
+ fldi.bi $fd30, [$r0], #8
+ fldi.bi $fd29, [$r0], #8
+ fldi.bi $fd28, [$r0], #8
+ fldi.bi $fd27, [$r0], #8
+ fldi.bi $fd26, [$r0], #8
+ fldi.bi $fd25, [$r0], #8
+ fldi.bi $fd24, [$r0], #8
+.LCFG2:
+ fldi.bi $fd10, [$r0], #8
+ fldi.bi $fd9, [$r0], #8
+ fldi.bi $fd8, [$r0], #8
+.LCFG1:
+ fldi.bi $fd7, [$r0], #8
+ fldi.bi $fd6, [$r0], #8
+ fldi.bi $fd5, [$r0], #8
+ fldi.bi $fd4, [$r0], #8
+.LCFG0:
+ fldi.bi $fd3, [$r0], #8
+#endif /* NDS32_ABI_2FP_PLUS */
+
+
+ ! return error code; make sure error code is not 0
+ bnez $r1, .Ldone
+ movi $r1, #1
+.Ldone:
+ addi $r0, $r1, #0
+ ret
+END(__longjmp)
+libc_hidden_def(__longjmp)