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Simpler casting and more checking.

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Copied from Perforce
 Change: 185502
 ServerID: perforce.ravenbrook.com
This commit is contained in:
Gareth Rees 2014-04-14 11:34:20 +01:00
parent 2eac654319
commit e3604e83ab
1 changed files with 23 additions and 18 deletions
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41
mps/code/prmci6xc.c
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@ -31,33 +31,38 @@ SRCID(prmci6li, "$Id$");
MRef Prmci6AddressHoldingReg(MutatorFaultContext mfc, unsigned int regnum)
{
THREAD_STATE_S *threadState;
AVER(mfc != NULL);
AVER(NONNEGATIVE(regnum));
AVER(regnum <= 15);
AVER(mfc->threadState != NULL);
threadState = mfc->threadState;
/* .assume.regref */
/* The register numbers (REG_RAX etc.) are defined in <ucontext.h>
but only if _XOPEN_SOURCE is defined: see .feature.xc in
config.h. */
/* MRef (a Word *) is not compatible with pointers to the register
types (actually a __uint64_t). To avoid aliasing optimization
problems, The registers are cast through (char *) */
types (actually a __uint64_t). To avoid aliasing optimization
problems, the registers are cast through (void *). */
switch (regnum) {
case 0: return (MRef)((char *)&mfc->threadState->__rax);
case 1: return (MRef)((char *)&mfc->threadState->__rcx);
case 2: return (MRef)((char *)&mfc->threadState->__rdx);
case 3: return (MRef)((char *)&mfc->threadState->__rbx);
case 4: return (MRef)((char *)&mfc->threadState->__rsp);
case 5: return (MRef)((char *)&mfc->threadState->__rbp);
case 6: return (MRef)((char *)&mfc->threadState->__rsi);
case 7: return (MRef)((char *)&mfc->threadState->__rdi);
case 8: return (MRef)((char *)&mfc->threadState->__r8);
case 9: return (MRef)((char *)&mfc->threadState->__r9);
case 10: return (MRef)((char *)&mfc->threadState->__r10);
case 11: return (MRef)((char *)&mfc->threadState->__r11);
case 12: return (MRef)((char *)&mfc->threadState->__r12);
case 13: return (MRef)((char *)&mfc->threadState->__r13);
case 14: return (MRef)((char *)&mfc->threadState->__r14);
case 15: return (MRef)((char *)&mfc->threadState->__r15);
case 0: return (void *)&threadState->__rax;
case 1: return (void *)&threadState->__rcx;
case 2: return (void *)&threadState->__rdx;
case 3: return (void *)&threadState->__rbx;
case 4: return (void *)&threadState->__rsp;
case 5: return (void *)&threadState->__rbp;
case 6: return (void *)&threadState->__rsi;
case 7: return (void *)&threadState->__rdi;
case 8: return (void *)&threadState->__r8;
case 9: return (void *)&threadState->__r9;
case 10: return (void *)&threadState->__r10;
case 11: return (void *)&threadState->__r11;
case 12: return (void *)&threadState->__r12;
case 13: return (void *)&threadState->__r13;
case 14: return (void *)&threadState->__r14;
case 15: return (void *)&threadState->__r15;
default:
NOTREACHED;
return NULL; /* Avoids compiler warning. */