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[X86]: Correctly sign-extend 16-bit immediate in CALL instruction.

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Patch by Matthew Barney. Thanks!

Differential Revision: http://reviews.llvm.org/D9514

llvm-svn: 240795
This commit is contained in:
Douglas Katzman 2015-06-26 16:58:59 +00:00
parent 425da04d1a
commit 149da381f0
4 changed files with 18 additions and 1 deletions
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8
lib/Target/X86/Disassembler/X86Disassembler.cpp
View File

@ -551,9 +551,15 @@ static void translateImmediate(MCInst &mcInst, uint64_t immediate,
case TYPE_REL8:
isBranch = true;
pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize;
if(immediate & 0x80)
if (immediate & 0x80)
immediate |= ~(0xffull);
break;
case TYPE_REL16:
isBranch = true;
pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize;
if (immediate & 0x8000)
immediate |= ~(0xffffull);
break;
case TYPE_REL32:
case TYPE_REL64:
isBranch = true;

2
test/MC/Disassembler/X86/x86-16.txt
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@ -786,3 +786,5 @@
# CHECK: lretl
0x66 0xcb
# CHECK: callw -1
0xe8 0xff 0xff

3
test/MC/Disassembler/X86/x86-32.txt
View File

@ -54,6 +54,9 @@
# CHECK: calll -1234
0xe8 0x2e 0xfb 0xff 0xff
# CHECK: callw -1
0x66 0xe8 0xff 0xff
# CHECK: lfence
0x0f 0xae 0xe8

6
test/MC/Disassembler/X86/x86-64.txt
View File

@ -339,3 +339,9 @@
# CHECK: vaddps (%rdx,%xmm1), %zmm20, %zmm15
# FIXME: vaddps (%rdx,%rcx), %zmm20, %zmm15
0x62 0x71 0x5c 0x40 0x58 0x3c 0x0a
# CHECK: callq 32767
0xe8 0xff 0x7f 0x00 0x00
# CHECK: callq -32769
0xe8 0xff 0x7f 0xff 0xff