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authorEric Andersen <andersen@codepoet.org>2002-02-04 13:51:21 +0000
committerEric Andersen <andersen@codepoet.org>2002-02-04 13:51:21 +0000
commit473a7dd3d8c4ae64956db05872e35a0336f447ab (patch)
treecfa6fdefe00b6559d6518546aab56a43fad1a17a /libc/sysdeps/linux/mips/__longjmp.c
parent330eb7bad0aeb0f95a12eb77791bdb4b828249d4 (diff)
Fixup mips so it now works and provides basic functionality
Diffstat (limited to 'libc/sysdeps/linux/mips/__longjmp.c')
-rw-r--r--libc/sysdeps/linux/mips/__longjmp.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/__longjmp.c b/libc/sysdeps/linux/mips/__longjmp.c
new file mode 100644
index 000000000..750a71fd1
--- /dev/null
+++ b/libc/sysdeps/linux/mips/__longjmp.c
@@ -0,0 +1,84 @@
+/* Copyright (C) 1992, 1995, 1997, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Brendan Kehoe (brendan@zen.org).
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <setjmp.h>
+#include <stdlib.h>
+
+#undef __longjmp
+
+#ifndef __GNUC__
+ #error This file uses GNU C extensions; you must compile with GCC.
+#endif
+
+void
+__longjmp (env, val_arg)
+ __jmp_buf env;
+ int val_arg;
+{
+ /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
+ the hack around it); force it to use $a1 for the longjmp value.
+ Without this it saves $a1 in a register which gets clobbered
+ along the way. */
+ register int val asm ("a1");
+
+ /* Pull back the floating point callee-saved registers. */
+ asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
+ asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
+ asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
+ asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
+ asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
+ asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
+
+ /* Get and reconstruct the floating point csr. */
+ asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
+ asm volatile ("ctc1 $2, $31");
+
+ /* Get the GP. */
+ asm volatile ("lw $gp, %0" : : "m" (env[0].__gp));
+
+ /* Get the callee-saved registers. */
+ asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0]));
+ asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1]));
+ asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2]));
+ asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3]));
+ asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4]));
+ asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5]));
+ asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6]));
+ asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7]));
+
+ /* Get the PC. */
+ asm volatile ("lw $25, %0" : : "m" (env[0].__pc));
+
+ /* Restore the stack pointer and the FP. They have to be restored
+ last and in a single asm as gcc, depending on options used, may
+ use either of them to access env. */
+ asm volatile ("lw $29, %0\n\t"
+ "lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
+
+/* Give setjmp 1 if given a 0, or what they gave us if non-zero. */
+ if (val == 0)
+ asm volatile ("li $2, 1");
+ else
+ asm volatile ("move $2, %0" : : "r" (val));
+
+ asm volatile ("jr $25");
+
+ /* Avoid `volatile function does return' warnings. */
+ for (;;);
+}