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commit e2dec0ff9b1e071779bee2c4e6fc82f8194b1c1d
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Author: Mark Wielaard <mark@klomp.org>
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Date: Sun Jul 26 21:17:23 2020 +0200
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Handle REX prefixed JMP instruction.
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The NET Core runtime might generate a JMP with a REX prefix.
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For Jv (32bit offset) and Jb (8bit offset) this is valid.
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Prefixes that change operand size are ignored for such JMPs.
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So remove the check for sz == 4 and force sz = 4 for Jv.
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https://bugs.kde.org/show_bug.cgi?id=422174
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diff --git a/VEX/priv/guest_amd64_toIR.c b/VEX/priv/guest_amd64_toIR.c
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index fadf47d41..7888132eb 100644
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--- a/VEX/priv/guest_amd64_toIR.c
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+++ b/VEX/priv/guest_amd64_toIR.c
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@@ -21392,8 +21392,8 @@ Long dis_ESC_NONE (
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case 0xE9: /* Jv (jump, 16/32 offset) */
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if (haveF3(pfx)) goto decode_failure;
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- if (sz != 4)
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- goto decode_failure; /* JRS added 2004 July 11 */
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+ sz = 4; /* Prefixes that change operand size are ignored for this
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+ instruction. Operand size is forced to 32bit. */
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if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
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d64 = (guest_RIP_bbstart+delta+sz) + getSDisp(sz,delta);
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delta += sz;
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@@ -21404,8 +21404,7 @@ Long dis_ESC_NONE (
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case 0xEB: /* Jb (jump, byte offset) */
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if (haveF3(pfx)) goto decode_failure;
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- if (sz != 4)
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- goto decode_failure; /* JRS added 2004 July 11 */
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+ /* Prefixes that change operand size are ignored for this instruction. */
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if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
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d64 = (guest_RIP_bbstart+delta+1) + getSDisp8(delta);
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delta++;
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