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This commit is contained in:
Roland McGrath
1992-11-25 18:45:51 +00:00
parent 14245eb70e
commit 01305a522c
1 changed files with 17 additions and 9 deletions
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26
sysdeps/alpha/__longjmp.c
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@@ -44,8 +44,6 @@ register double
volatile void volatile void
__longjmp (const jmp_buf env, int val) __longjmp (const jmp_buf env, int val)
{ {
register long int retval asm ("$0");
/* Restore the integer registers. */ /* Restore the integer registers. */
r9 = env[0].__9; r9 = env[0].__9;
r10 = env[0].__10; r10 = env[0].__10;
@@ -69,20 +67,30 @@ __longjmp (const jmp_buf env, int val)
/* Set the return PC to that of setjmp's caller. */ /* Set the return PC to that of setjmp's caller. */
retpc = env[0].__pc; retpc = env[0].__pc;
/* Return VAL (or 1 if VAL is zero) to setjmp's caller. */
retval = val ?: 1;
/* Restore the FP and SP of setjmp's caller. */ /* Restore the FP and SP of setjmp's caller. */
fp = env[0].__fp; fp = env[0].__fp;
sp = env[0].__sp; sp = env[0].__sp;
/* We use an asm here rather than a normal C return statement /* Return VAL (or 1 if VAL is zero) to setjmp's caller.
We use an asm here rather than a normal C return statement
just in case the compiler wanted to do some stack frobnication just in case the compiler wanted to do some stack frobnication
in the function epilogue. Since we have already restored in the function epilogue. Since we have already restored
precisely the FP and SP the desired environment needs, precisely the FP and SP the desired environment needs,
we must avoid the compiler doing anything with the stack. */ we must avoid the compiler doing anything with the stack. */
while (1) while (1)
/* The loop is just to avoid `volatile function does return' warnings. {
The instruction will only be executed once. */ /* The loop is just to avoid `volatile function does return' warnings.
asm volatile ("ret $31, (%0), 1" : : "r" (retpc)); The instruction will only be executed once. */
register long int retval asm ("$0");
asm volatile
("cmoveq %1, 1, %0\n\t" /* $0 = val ?: 1; */
"ret $31, (%2), 1" /* return $0 */
: "=r" (retval)
/* The "0" constraint should force VAL into $0. */
: "0" (val), "r" (retpc));
}
} }