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Save/Restore arg regs and nonvolatile regs the compiler might use during

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CompilationCallback

llvm-svn: 18175
This commit is contained in:
Nate Begeman 2004-11-23 21:34:18 +00:00
parent 08eb9d0d18
commit 7ae4c39fc6
1 changed files with 29 additions and 12 deletions
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41
lib/Target/PowerPC/PPC32JITInfo.cpp
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@ -48,10 +48,22 @@ static void EmitBranchToAt(void *At, void *To, bool isCall) {
}
static void CompilationCallback() {
// FIXME: Should save R3-R10 and F1-F13 onto the stack, just like the Sparc
// version does.
//int IntRegs[8];
//uint64_t FPRegs[13];
// Save R3-R31, since we want to restore arguments and nonvolatile regs used
// by the compiler. We also save and restore the FP regs, although this is
// probably just paranoia (gcc is unlikely to emit code that uses them for
// for this function.
#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)
unsigned IntRegs[29];
double FPRegs[13];
__asm__ __volatile__ (
"stmw r3, 0(%0)\n"
"stfd f1, 0(%1)\n" "stfd f2, 8(%1)\n" "stfd f3, 16(%1)\n"
"stfd f4, 24(%1)\n" "stfd f5, 32(%1)\n" "stfd f6, 40(%1)\n"
"stfd f7, 48(%1)\n" "stfd f8, 56(%1)\n" "stfd f9, 64(%1)\n"
"stfd f10, 72(%1)\n" "stfd f11, 80(%1)\n" "stfd f12, 88(%1)\n"
"stfd f13, 96(%1)\n" :: "r" (IntRegs), "r" (FPRegs) );
#endif
unsigned *CameFromStub = (unsigned*)__builtin_return_address(0);
unsigned *CameFromOrig = (unsigned*)__builtin_return_address(1);
unsigned *CCStackPtr = (unsigned*)__builtin_frame_address(0);
@ -95,16 +107,21 @@ static void CompilationCallback() {
CCStackPtr[2] = (intptr_t)CameFromStub;
CCStackPtr[1] = (intptr_t)CameFromOrig;
// FIXME: Need to restore the registers from IntRegs/FPRegs.
// Note, this is not a standard epilog!
#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)
__asm__ __volatile__ ("lwz r0,4(r1)\n" // Get CameFromOrig (LR into stub)
"mtlr r0\n" // Put it in the LR register
"lwz r0,8(r1)\n" // Get "CameFromStub"
"mtctr r0\n" // Put it into the CTR register
"lwz r1,0(r1)\n" // Pop two frames off
"bctr\n" ::); // Return to stub!
__asm__ __volatile__ (
"lfd f1, 0(%0)\n" "lfd f2, 8(%0)\n" "lfd f3, 16(%0)\n"
"lfd f4, 24(%0)\n" "lfd f5, 32(%0)\n" "lfd f6, 40(%0)\n"
"lfd f7, 48(%0)\n" "lfd f8, 56(%0)\n" "lfd f9, 64(%0)\n"
"lfd f10, 72(%0)\n" "lfd f11, 80(%0)\n" "lfd f12, 88(%0)\n"
"lfd f13, 96(%0)\n" "lmw r3, 0(%1)\n"
"lwz r0,4(r1)\n" // Get CameFromOrig (LR into stub)
"mtlr r0\n" // Put it in the LR register
"lwz r0,8(r1)\n" // Get "CameFromStub"
"mtctr r0\n" // Put it into the CTR register
"lwz r1,0(r1)\n" // Pop two frames off
"bctr\n" :: // Return to stub!
"r" (FPRegs), "r" (IntRegs));
#endif
}