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Update the PPC compilation callback code to not need weird abi-violating
prologs and epilogs, keep all the asm in one place, and remove use of compiler builtin functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
parent
b3674e4753
commit
5425267e84
@ -60,23 +60,51 @@ asm(
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".align 2\n"
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".globl _PPC32CompilationCallback\n"
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"_PPC32CompilationCallback:\n"
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// Make space for 29 ints r[3-31] and 14 doubles f[0-13]
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"stwu r1, -272(r1)\n"
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"mflr r11\n"
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"stw r11, 280(r1)\n" // Set up a proper stack frame
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"stmw r3, 156(r1)\n" // Save all of the integer registers
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// Make space for 8 ints r[3-10] and 13 doubles f[1-13] and the
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// FIXME: need to save v[0-19] for altivec?
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// Set up a proper stack frame
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"stwu r1, -208(r1)\n"
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"mflr r0\n"
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"stw r0, 216(r1)\n"
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// Save all int arg registers
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"stw r10, 204(r1)\n" "stw r9, 200(r1)\n"
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"stw r8, 196(r1)\n" "stw r7, 192(r1)\n"
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"stw r6, 188(r1)\n" "stw r5, 184(r1)\n"
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"stw r4, 180(r1)\n" "stw r3, 176(r1)\n"
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// Save all call-clobbered FP regs.
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"stfd f1, 44(r1)\n" "stfd f2, 52(r1)\n" "stfd f3, 60(r1)\n"
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"stfd f4, 68(r1)\n" "stfd f5, 76(r1)\n" "stfd f6, 84(r1)\n"
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"stfd f7, 92(r1)\n" "stfd f8, 100(r1)\n" "stfd f9, 108(r1)\n"
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"stfd f10, 116(r1)\n" "stfd f11, 124(r1)\n" "stfd f12, 132(r1)\n"
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"stfd f13, 140(r1)\n"
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// Now that everything is saved, go to the C compilation callback function,
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// passing the address of the intregs and fpregs.
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"addi r3, r1, 156\n" // &IntRegs[0]
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"addi r4, r1, 44\n" // &FPRegs[0]
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"stfd f13, 168(r1)\n" "stfd f12, 160(r1)\n"
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"stfd f11, 152(r1)\n" "stfd f10, 144(r1)\n"
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"stfd f9, 136(r1)\n" "stfd f8, 128(r1)\n"
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"stfd f7, 120(r1)\n" "stfd f6, 112(r1)\n"
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"stfd f5, 104(r1)\n" "stfd f4, 96(r1)\n"
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"stfd f3, 88(r1)\n" "stfd f2, 80(r1)\n"
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"stfd f1, 72(r1)\n"
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// Arguments to Compilation Callback:
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// r3 - our lr (address of the call instruction in stub plus 4)
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// r4 - stub's lr (address of instruction that called the stub plus 4)
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"mr r3, r0\n"
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"lwz r2, 208(r1)\n" // stub's frame
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"lwz r4, 8(r2)\n" // stub's lr
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"bl _PPC32CompilationCallbackC\n"
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"mtctr r3\n"
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// Restore all int arg registers
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"lwz r10, 204(r1)\n" "lwz r9, 200(r1)\n"
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"lwz r8, 196(r1)\n" "lwz r7, 192(r1)\n"
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"lwz r6, 188(r1)\n" "lwz r5, 184(r1)\n"
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"lwz r4, 180(r1)\n" "lwz r3, 176(r1)\n"
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// Restore all FP arg registers
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"lfd f13, 168(r1)\n" "lfd f12, 160(r1)\n"
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"lfd f11, 152(r1)\n" "lfd f10, 144(r1)\n"
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"lfd f9, 136(r1)\n" "lfd f8, 128(r1)\n"
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"lfd f7, 120(r1)\n" "lfd f6, 112(r1)\n"
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"lfd f5, 104(r1)\n" "lfd f4, 96(r1)\n"
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"lfd f3, 88(r1)\n" "lfd f2, 80(r1)\n"
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"lfd f1, 72(r1)\n"
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// Pop 3 frames off the stack and branch to target
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"lwz r1, 208(r1)\n"
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"lwz r2, 8(r1)\n"
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"mtlr r2\n"
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"bctr\n"
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);
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#else
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void PPC32CompilationCallback() {
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@ -85,12 +113,8 @@ void PPC32CompilationCallback() {
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}
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#endif
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extern "C" void PPC32CompilationCallbackC(unsigned *IntRegs, double *FPRegs) {
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unsigned *StubCallAddrPlus4 = (unsigned*)__builtin_return_address(0+1);
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unsigned *OrigCallAddrPlus4 = (unsigned*)__builtin_return_address(1+1);
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unsigned *CurStackPtr = (unsigned*)__builtin_frame_address(0);
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unsigned *OrigStackPtr = (unsigned*)__builtin_frame_address(2+1);
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extern "C" unsigned *PPC32CompilationCallbackC(unsigned *StubCallAddrPlus4,
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unsigned *OrigCallAddrPlus4) {
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// Adjust the pointer to the address of the call instruction in the stub
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// emitted by emitFunctionStub, rather than the instruction after it.
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unsigned *StubCallAddr = StubCallAddrPlus4 - 1;
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@ -124,37 +148,10 @@ extern "C" void PPC32CompilationCallbackC(unsigned *IntRegs, double *FPRegs) {
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// who took the address of the stub.
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EmitBranchToAt(StubCallAddr, Target, false);
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// Change the stored stack pointer so that we pop three stack frames:
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// 1. PPC32CompilationCallbackC's frame
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// 2. _PPC32CompilationCallback's frame
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// 3. the stub's frame
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*CurStackPtr = (intptr_t)OrigStackPtr;
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// Put the address of the target function to call and the address to return to
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// after calling the target function in a place that is easy to get on the
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// stack after we restore all regs.
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CurStackPtr[2] = (intptr_t)Target;
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CurStackPtr[1] = (intptr_t)OrigCallAddrPlus4;
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// Note, this is not a standard epilog!
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#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)
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register unsigned *IRR asm ("r2") = IntRegs;
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register double *FRR asm ("r3") = FPRegs;
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__asm__ __volatile__ (
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"lfd f1, 0(%0)\n" "lfd f2, 8(%0)\n" "lfd f3, 16(%0)\n"
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"lfd f4, 24(%0)\n" "lfd f5, 32(%0)\n" "lfd f6, 40(%0)\n"
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"lfd f7, 48(%0)\n" "lfd f8, 56(%0)\n" "lfd f9, 64(%0)\n"
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"lfd f10, 72(%0)\n" "lfd f11, 80(%0)\n" "lfd f12, 88(%0)\n"
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"lfd f13, 96(%0)\n"
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"lmw r3, 0(%1)\n" // Load all integer regs
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"lwz r0,4(r1)\n" // Get OrigCallAddrPlus4 (LR value when stub was called)
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"mtlr r0\n" // Put it in the LR register
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"lwz r0,8(r1)\n" // Get target function pointer
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"mtctr r0\n" // Put it into the CTR register
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"lwz r1,0(r1)\n" // Pop three frames off
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"bctr\n" :: // Call target function
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"b" (FRR), "b" (IRR));
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#endif
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return (unsigned *)Target;
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}
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