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From: Julian S. <se...@so...> - 2019-11-13 14:46:00
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=4f85d9a67ab437ef5624c0302b1850f9c6620772 commit 4f85d9a67ab437ef5624c0302b1850f9c6620772 Author: Julian Seward <js...@ac...> Date: Wed Nov 13 15:45:11 2019 +0100 insn_has_no_other_exits_or_PUTs_to_PC: also check Ist_PutI and Ist_Dirty for writes to the PC. Diff: --- VEX/priv/guest_generic_bb_to_IR.c | 38 +++++++++++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-) diff --git a/VEX/priv/guest_generic_bb_to_IR.c b/VEX/priv/guest_generic_bb_to_IR.c index 67e506f..3da99bc 100644 --- a/VEX/priv/guest_generic_bb_to_IR.c +++ b/VEX/priv/guest_generic_bb_to_IR.c @@ -622,9 +622,8 @@ static Bool any_overlap ( Int start1, Int len1, Int start2, Int len2 ) words, it scans backwards through some prefix of an instruction's IR to see if there is an exit there. - It also checks for explicit PUTs to the PC. - - FIXME: also check PutI and dirty helper calls for such PUTs. */ + It also checks for explicit PUTs to the PC, via Ist_Put, Ist_PutI or + Ist_Dirty. I suspect this is ridiculous overkill, but is here for safety. */ static Bool insn_has_no_other_exits_or_PUTs_to_PC ( IRStmt** const stmts, Int scan_start, Int offB_GUEST_IP, Int szB_GUEST_IP, @@ -654,6 +653,39 @@ static Bool insn_has_no_other_exits_or_PUTs_to_PC ( break; } } + if (st->tag == Ist_PutI) { + const IRPutI* details = st->Ist.PutI.details; + const IRRegArray* descr = details->descr; + Int offB = descr->base; + Int szB = descr->nElems * sizeofIRType(descr->elemTy); + if (any_overlap(offB, szB, offB_GUEST_IP, szB_GUEST_IP)) { + found_PUT_to_PC = True; + break; + } + } + if (st->tag == Ist_Dirty) { + vassert(!found_PUT_to_PC); + const IRDirty* details = st->Ist.Dirty.details; + for (Int j = 0; j < details->nFxState; j++) { + const IREffect fx = details->fxState[j].fx; + const Int offset = details->fxState[j].offset; + const Int size = details->fxState[j].size; + const Int nRepeats = details->fxState[j].nRepeats; + const Int repeatLen = details->fxState[j].repeatLen; + if (fx == Ifx_Write || fx == Ifx_Modify) { + for (Int k = 0; k < nRepeats; k++) { + Int offB = offset + k * repeatLen; + Int szB = size; + if (any_overlap(offB, szB, offB_GUEST_IP, szB_GUEST_IP)) { + found_PUT_to_PC = True; + } + } + } + } + if (found_PUT_to_PC) { + break; + } + } i--; } // We expect IR for all instructions to start with an IMark. |