32 lines
1.5 KiB
Diff
32 lines
1.5 KiB
Diff
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diff --git a/VEX/priv/guest_ppc_toIR.c b/VEX/priv/guest_ppc_toIR.c
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index adabf64..8f7e4aa 100644
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--- a/VEX/priv/guest_ppc_toIR.c
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+++ b/VEX/priv/guest_ppc_toIR.c
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@@ -18783,10 +18783,26 @@ DisResult disInstr_PPC_WRK (
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UInt word2 = mode64 ? 0x78006800 : 0x5400683E;
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UInt word3 = mode64 ? 0x7800E802 : 0x5400E83E;
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UInt word4 = mode64 ? 0x78009802 : 0x5400983E;
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+ Bool is_special_preamble = False;
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if (getUIntPPCendianly(code+ 0) == word1 &&
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getUIntPPCendianly(code+ 4) == word2 &&
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getUIntPPCendianly(code+ 8) == word3 &&
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getUIntPPCendianly(code+12) == word4) {
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+ is_special_preamble = True;
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+ } else if (! mode64 &&
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+ getUIntPPCendianly(code+ 0) == 0x54001800 &&
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+ getUIntPPCendianly(code+ 4) == 0x54006800 &&
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+ getUIntPPCendianly(code+ 8) == 0x5400E800 &&
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+ getUIntPPCendianly(code+12) == 0x54009800) {
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+ static Bool reported = False;
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+ if (!reported) {
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+ vex_printf("disInstr(ppc): old ppc32 instruction magic detected. Code might clobber r0.\n");
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+ vex_printf("disInstr(ppc): source needs to be recompiled against latest valgrind.h.\n");
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+ reported = True;
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+ }
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+ is_special_preamble = True;
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+ }
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+ if (is_special_preamble) {
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/* Got a "Special" instruction preamble. Which one is it? */
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if (getUIntPPCendianly(code+16) == 0x7C210B78 /* or 1,1,1 */) {
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/* %R3 = client_request ( %R4 ) */
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