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authorUlrich Drepper <drepper@redhat.com>1999-01-28 22:09:12 +0000
committerUlrich Drepper <drepper@redhat.com>1999-01-28 22:09:12 +0000
commit8163845fdab02ba1943b608b635873cee50df676 (patch)
tree06a81f336e654c64ba7282356b4c79d5c91a4589 /sysdeps/sparc
parent1f749a3ba208fd615b5524eb6bbeea212211ff1a (diff)
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Update.
1999-01-28 David S. Miller <davem@redhat.com> * sysdeps/sparc/sparc32/__longjmp.S: Rewrite without bogus sanity checks and aborts, to make longjmp based thread schemes work again.
Diffstat (limited to 'sysdeps/sparc')
-rw-r--r--sysdeps/sparc/sparc32/__longjmp.S49
1 files changed, 32 insertions, 17 deletions
diff --git a/sysdeps/sparc/sparc32/__longjmp.S b/sysdeps/sparc/sparc32/__longjmp.S
index cbd941fa82..6f984b98e9 100644
--- a/sysdeps/sparc/sparc32/__longjmp.S
+++ b/sysdeps/sparc/sparc32/__longjmp.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 93, 96, 97, 98, 99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -19,20 +19,27 @@
#include <sysdep.h>
#define _ASM 1
-#define _SETJMP_H
-#include <bits/setjmp.h>
-#define ENV(reg) [%g1 + (reg * 4)]
+#include <jmp_buf.h>
+#define ENV(base,reg) [%base + (reg * 4)]
+#define ST_FLUSH_WINDOWS 3
+#define RW_FP [%fp + 0x38]
ENTRY(__longjmp)
/* Store our arguments in global registers so we can still
use them while unwinding frames and their register windows. */
+
+ ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */
mov %o0, %g1 /* ENV in %g1 */
orcc %o1, %g0, %g2 /* VAL in %g2 */
be,a 0f /* Branch if zero; else skip delay slot. */
mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */
0:
- /* Cache target FP in register %g3. */
- ld ENV(JB_FP), %g3
+ xor %fp, %g3, %o0
+ add %fp, 512, %o1
+ andncc %o0, 4095, %o0
+ bne LOC(thread)
+ cmp %o1, %g3
+ bl LOC(thread)
/* Now we will loop, unwinding the register windows up the stack
until the restored %fp value matches the target value in %g3. */
@@ -42,23 +49,31 @@ LOC(loop):
bl,a LOC(loop) /* Loop while current fp is below target. */
restore /* Unwind register window in delay slot. */
be,a LOC(found) /* Better have hit it exactly. */
- ld ENV(JB_SP), %o0 /* Delay slot: extract target SP. */
+ ld ENV(g1,JB_SP), %o0 /* Delay slot: extract target SP. */
-LOC(bogus):
- /* Get here only if the jmp_buf or stack is clobbered. */
- call C_SYMBOL_NAME(abort)
- nop
- unimp 0
+LOC(thread):
+ /*
+ * Do a "flush register windows trap". The trap handler in the
+ * kernel writes all the register windows to their stack slots, and
+ * marks them all as invalid (needing to be sucked up from the
+ * stack when used). This ensures that all information needed to
+ * unwind to these callers is in memory, not in the register
+ * windows.
+ */
+ ta ST_FLUSH_WINDOWS
+ ld ENV(g1,JB_PC), %o7 /* Set return PC. */
+ ld ENV(g1,JB_SP), %fp /* Set saved SP on restore below. */
+ sub %fp, 64, %sp /* Allocate a register frame. */
+ st %g3, RW_FP /* Set saved FP on restore below. */
+ retl
+ restore %g2, 0, %o0 /* Restore values from above register frame. */
LOC(found):
/* We have unwound register windows so %fp matches the target. */
- cmp %o0, %sp /* Check jmp_buf SP vs register window. */
- bge,a LOC(sp_ok) /* Saved must not be deeper than register. */
- mov %o0, %sp /* OK, install new SP. */
- b,a LOC(bogus) /* Bogus, we lose. */
+ mov %o0, %sp /* OK, install new SP. */
LOC(sp_ok):
- ld ENV(JB_PC), %o0 /* Extract target return PC. */
+ ld ENV(g1,JB_PC), %o0 /* Extract target return PC. */
jmp %o0 + 8 /* Return there. */
mov %g2, %o0 /* Delay slot: set return value. */