[PATCH] Fix setjmp/longjmp for moxie

[Anthony Green]

The moxie port has a very old setjmp/longjmp bug that this patch
remedies.   I plan on checking in this fix, which saves and restores
the stack frame as part of setjmp/longjmp.

Thanks,

AG

---
 newlib/libc/include/machine/setjmp.h |  2 +-
 newlib/libc/machine/moxie/setjmp.S   | 71 ++++++++++++++++++----------
 2 files changed, 48 insertions(+), 25 deletions(-)

diff --git a/newlib/libc/include/machine/setjmp.h
b/newlib/libc/include/machine/setjmp.h
index 25fdea2..78a81b5 100644
--- a/newlib/libc/include/machine/setjmp.h
+++ b/newlib/libc/include/machine/setjmp.h
@@ -238,7 +238,7 @@ _BEGIN_STD_C
 #endif

 #ifdef __moxie__
-#define _JBLEN 16
+#define _JBLEN 19
 #endif

 #ifdef __CRX__
diff --git a/newlib/libc/machine/moxie/setjmp.S
b/newlib/libc/machine/moxie/setjmp.S
index 6c2c015..ed261d5 100644
--- a/newlib/libc/machine/moxie/setjmp.S
+++ b/newlib/libc/machine/moxie/setjmp.S
@@ -1,5 +1,5 @@
 /* A setjmp.c for Moxie
-   Copyright (C) 2009  Anthony Green
+   Copyright (C) 2009, 2019  Anthony Green

    The authors hereby grant permission to use, copy, modify, distribute,
    and license this software and its documentation for any purpose, provided
@@ -12,28 +12,31 @@
    they apply.  */

 # setjmp/longjmp for moxie.  The jmpbuf looks like this:
-#
-# Register jmpbuf offset
-#   $r0   0x00
-#   $r1   0x04
-#   $r2   0x08
-#   $r3   0x0c
-#   $r4   0x10
-#   $r5   0x14
-#   $r6   0x18
-#   $r7   0x1c
-#   $r8   0x20
-#   $r9   0x24
-#   $r10   0x28
-#   $r11   0x2c
-#   $r12   0x30
-#   $r13   0x34
-#   $fp   0x38
-#   $sp   0x3c
-
- .text
- .global setjmp
- .type setjmp,@function
+#
+# Register        jmpbuf offset
+#   $r0             0x00
+#   $r1             0x04
+#   $r2             0x08
+#   $r3             0x0c
+#   $r4             0x10
+#   $r5             0x14
+#   $r6             0x18
+#   $r7             0x1c
+#   $r8             0x20
+#   $r9             0x24
+#   $r10            0x28
+#   $r11            0x2c
+#   $r12            0x30
+#   $r13            0x34
+#   $fp             0x38
+#   $sp             0x3c
+#   stack frame fp  0x40
+#   stack frame ra  0x44
+#   stack frame sc  0x48
+
+        .text
+        .global setjmp
+        .type   setjmp,@function
 setjmp:
  st.l ($r0),     $r0
  sto.l 0x04($r0), $r1
@@ -51,6 +54,13 @@ setjmp:
  sto.l 0x34($r0), $r13
  sto.l 0x38($r0), $sp
  sto.l 0x3c($r0), $fp
+ ldo.l   $r1,       0x0($fp)
+ sto.l   0x40($r0), $r1
+ ldo.l   $r1,       0x04($fp)
+ sto.l   0x44($r0), $r1
+ ldo.l   $r1,       0x08($fp)
+ sto.l   0x48($r0), $r1
+ ldo.l $r1,       0x04($r0)
  xor $r0, $r0
  ret
 .Lend1:
@@ -62,7 +72,6 @@ longjmp:
  ldi.l $r2, 0x00
  cmp $r1, $r2
  beq .Lreturn1
- ldo.l $r1, 0x04($r0)
  ldo.l $r2, 0x08($r0)
  ldo.l $r3, 0x0c($r0)
  ldo.l $r4, 0x10($r0)
@@ -77,6 +86,13 @@ longjmp:
  ldo.l $r13, 0x34($r0)
  ldo.l $sp, 0x38($r0)
  ldo.l $fp, 0x3c($r0)
+ ldo.l   $r1, 0x40($r0)
+ sto.l   0x0($fp), $r1
+ ldo.l   $r1, 0x44($r0)
+ sto.l   0x4($fp), $r1
+ ldo.l   $r1, 0x48($r0)
+ sto.l   0x8($fp), $r1
+ ldo.l $r1, 0x04($r0)
  mov $r0, $r1
  ret
 .Lreturn1:
@@ -95,6 +111,13 @@ longjmp:
  ldo.l $r13, 0x34($r0)
  ldo.l $sp, 0x38($r0)
  ldo.l $fp, 0x3c($r0)
+ ldo.l   $r1, 0x40($r0)
+ sto.l   0x0($fp), $r1
+ ldo.l   $r1, 0x44($r0)
+ sto.l   0x4($fp), $r1
+ ldo.l   $r1, 0x48($r0)
+ sto.l   0x8($fp), $r1
+ ldo.l $r1, 0x04($r0)
  ldi.l $r0, 0x01
  ret
 .Lend2:
--