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| author | liuhongt <hongtao.liu@intel.com> | 2020-05-09 15:02:50 +0800 |
|---|---|---|
| committer | liuhongt <hongtao.liu@intel.com> | 2020-05-18 10:23:59 +0800 |
| commit | 503648e41efa19dfb059757ffddf0206b6060520 (patch) | |
| tree | 29a806712618bc2fedf880b6db9270e33557f966 /gas/config/tc-i386.c | |
| parent | 07a78c595604b00908f06396aa221d446adbe6f8 (diff) | |
| download | gdb-503648e41efa19dfb059757ffddf0206b6060520.zip gdb-503648e41efa19dfb059757ffddf0206b6060520.tar.gz gdb-503648e41efa19dfb059757ffddf0206b6060520.tar.bz2 | |
Don't handle lret/iret when -mlfence-before-ret=[or|not|shl|yes] since they are invalid in SGX enclaves.
gas/ChangeLog
* gas/config/tc-i386.c: Not handle lret/iret.
* gas/testsuite/gas/i386/lfence-ret-a.d: Adjust testcase.
* gas/testsuite/gas/i386/lfence-ret-b.d: Ditto.
* gas/testsuite/gas/i386/lfence-ret-c.d: Ditto.
* gas/testsuite/gas/i386/lfence-ret-d.d: Ditto.
* gas/testsuite/gas/i386/lfence-ret.s: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret-a.d: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret-b.d: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret-c.d: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret-d.d: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret-e.d: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret.s: Ditto.
* gas/testsuite/gas/i386/x86-64-lfence-ret.e: Deleted.
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 32fd6c1..ae1bd0d 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -4591,13 +4591,10 @@ insert_lfence_before (void) return; } - /* Output or/not/shl and lfence before ret/lret/iret. */ + /* Output or/not/shl and lfence before near ret. */ if (lfence_before_ret != lfence_before_ret_none && (i.tm.base_opcode == 0xc2 - || i.tm.base_opcode == 0xc3 - || i.tm.base_opcode == 0xca - || i.tm.base_opcode == 0xcb - || i.tm.base_opcode == 0xcf)) + || i.tm.base_opcode == 0xc3)) { if (last_insn.kind != last_insn_other && last_insn.seg == now_seg) @@ -4608,17 +4605,10 @@ insert_lfence_before (void) return; } - /* lret or iret. */ - bfd_boolean lret = (i.tm.base_opcode | 0x5) == 0xcf; - bfd_boolean has_rexw = i.prefix[REX_PREFIX] & REX_W; - char prefix = 0x0; - /* Default operand size for far return is 32 bits, - 64 bits for near return. */ /* Near ret ingore operand size override under CPU64. */ - if ((!lret && flag_code == CODE_64BIT) || has_rexw) - prefix = 0x48; - else if (i.prefix[DATA_PREFIX]) - prefix = 0x66; + char prefix = flag_code == CODE_64BIT + ? 0x48 + : i.prefix[DATA_PREFIX] ? 0x66 : 0x0; if (lfence_before_ret == lfence_before_ret_not) { |