Fixup mips so it now works and provides basic functionality

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 (;;);
+}