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glibc  2.9
Functions
__longjmp.c File Reference
#include <setjmp.h>
#include <sgidefs.h>
#include <stdlib.h>

Go to the source code of this file.

Functions

void __longjmp (__jmp_buf env, int val_arg)

Function Documentation

void __longjmp ( __jmp_buf  env,
int  val_arg 
)

Definition at line 32 of file __longjmp.c.

{
  /* 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");

#ifdef __mips_hard_float
  /* Pull back the floating point callee-saved registers.  */
#if _MIPS_SIM == _ABI64
  asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
#else
  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]));
#endif

  /* Get and reconstruct the floating point csr.  */
  asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr));
  asm volatile ("ctc1 $2, $31");
#endif

  /* Get the GP. */
  asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));

  /* Get the callee-saved registers.  */
  asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
  asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
  asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
  asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
  asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
  asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
  asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
  asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));

  /* Get the PC.  */
  asm volatile ("ld $31, %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 ("ld $29, %0\n\t"
              "ld $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 ("dli $2, 1");
  else
    asm volatile ("move $2, %0" : : "r" (val));

  asm volatile ("j $31");

  /* Avoid `volatile function does return' warnings.  */
  for (;;);
}