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Add Thumb2 eh_sjlj_setjmp implementation

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78701 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-08-11 19:42:21 +00:00
parent 3524bd7551
commit 5aa1684e5d
2 changed files with 34 additions and 0 deletions
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2
lib/Target/ARM/ARMBaseInstrInfo.cpp
View File

@ -441,6 +441,8 @@ unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
return MI->getOperand(2).getImm();
case ARM::Int_eh_sjlj_setjmp:
return 24;
case ARM::t2Int_eh_sjlj_setjmp:
return 20;
case ARM::BR_JTr:
case ARM::BR_JTm:
case ARM::BR_JTadd:

32
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -1063,6 +1063,38 @@ let isCall = 1,
[(set R0, ARMthread_pointer)]>;
}
//===----------------------------------------------------------------------===//
// SJLJ Exception handling intrinsics
// eh_sjlj_setjmp() is a three instruction sequence to store the return
// address and save #0 in R0 for the non-longjmp case.
// Since by its nature we may be coming from some other function to get
// here, and we're using the stack frame for the containing function to
// save/restore registers, we can't keep anything live in regs across
// the eh_sjlj_setjmp(), else it will almost certainly have been tromped upon
// when we get here from a longjmp(). We force everthing out of registers
// except for our own input by listing the relevant registers in Defs. By
// doing so, we also cause the prologue/epilogue code to actively preserve
// all of the callee-saved resgisters, which is exactly what we want.
let Defs =
[ R0, R1, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR,
D0, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15,
D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30,
D31 ] in {
def t2Int_eh_sjlj_setjmp : Thumb2XI<(outs), (ins GPR:$src),
AddrModeNone, SizeSpecial, NoItinerary,
"str.w sp, [$src, #+8] @ eh_setjmp begin\n"
"\tadr ip, 0f\n"
"\torr ip, #1\n"
"\tstr.w ip, [$src, #+4]\n"
"\tmovs r0, #0\n"
"\tb 1f\n"
"0:\tmovs r0, #1 @ eh_setjmp end\n"
"1:\n", "",
[(set R0, (ARMeh_sjlj_setjmp GPR:$src))]>;
}
//===----------------------------------------------------------------------===//
// Control-Flow Instructions
//