From 503648e41efa19dfb059757ffddf0206b6060520 Mon Sep 17 00:00:00 2001 From: liuhongt Date: Sat, 9 May 2020 15:02:50 +0800 Subject: [PATCH] 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. --- gas/ChangeLog | 16 +++++++++++++ gas/config/tc-i386.c | 20 ++++------------ gas/testsuite/gas/i386/lfence-ret-a.d | 12 ---------- gas/testsuite/gas/i386/lfence-ret-b.d | 16 ------------- gas/testsuite/gas/i386/lfence-ret-c.d | 14 +---------- gas/testsuite/gas/i386/lfence-ret-d.d | 12 ---------- gas/testsuite/gas/i386/lfence-ret.s | 4 ---- gas/testsuite/gas/i386/x86-64-lfence-ret-a.d | 19 --------------- gas/testsuite/gas/i386/x86-64-lfence-ret-b.d | 25 -------------------- gas/testsuite/gas/i386/x86-64-lfence-ret-c.d | 19 --------------- gas/testsuite/gas/i386/x86-64-lfence-ret-d.d | 19 --------------- gas/testsuite/gas/i386/x86-64-lfence-ret-e.d | 19 --------------- gas/testsuite/gas/i386/x86-64-lfence-ret.e | 3 --- gas/testsuite/gas/i386/x86-64-lfence-ret.s | 6 ----- 14 files changed, 22 insertions(+), 182 deletions(-) delete mode 100644 gas/testsuite/gas/i386/x86-64-lfence-ret.e diff --git a/gas/ChangeLog b/gas/ChangeLog index 2a987616ece..3b8ea166f0c 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,19 @@ +2020-05-18 Hongtao Liu + + * config/tc-i386.c: Not handle lret/iret. + * testsuite/gas/i386/lfence-ret-a.d: Adjust testcase. + * testsuite/gas/i386/lfence-ret-b.d: Ditto. + * testsuite/gas/i386/lfence-ret-c.d: Ditto. + * testsuite/gas/i386/lfence-ret-d.d: Ditto. + * testsuite/gas/i386/lfence-ret.s: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret-a.d: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret-b.d: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret-c.d: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret-d.d: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret-e.d: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret.s: Ditto. + * testsuite/gas/i386/x86-64-lfence-ret.e: Deleted. + 2020-05-15 Alan Modra Alex Coplan diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 32fd6c15e1b..ae1bd0d5bbc 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) { diff --git a/gas/testsuite/gas/i386/lfence-ret-a.d b/gas/testsuite/gas/i386/lfence-ret-a.d index aa358576647..613d1d50a2c 100644 --- a/gas/testsuite/gas/i386/lfence-ret-a.d +++ b/gas/testsuite/gas/i386/lfence-ret-a.d @@ -21,16 +21,4 @@ Disassembly of section .text: +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: c2 1e 00 ret \$0x1e - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 #pass diff --git a/gas/testsuite/gas/i386/lfence-ret-b.d b/gas/testsuite/gas/i386/lfence-ret-b.d index 77001c425ef..e6dd4f4bf6b 100644 --- a/gas/testsuite/gas/i386/lfence-ret-b.d +++ b/gas/testsuite/gas/i386/lfence-ret-b.d @@ -25,20 +25,4 @@ Disassembly of section .text: +[a-f0-9]+: f7 14 24 notl \(%esp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: c2 1e 00 ret \$0x1e - +[a-f0-9]+: 66 f7 14 24 notw \(%esp\) - +[a-f0-9]+: 66 f7 14 24 notw \(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 f7 14 24 notw \(%esp\) - +[a-f0-9]+: 66 f7 14 24 notw \(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: f7 14 24 notl \(%esp\) - +[a-f0-9]+: f7 14 24 notl \(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: f7 14 24 notl \(%esp\) - +[a-f0-9]+: f7 14 24 notl \(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 #pass diff --git a/gas/testsuite/gas/i386/lfence-ret-c.d b/gas/testsuite/gas/i386/lfence-ret-c.d index fceb0eb182a..02f57fee702 100644 --- a/gas/testsuite/gas/i386/lfence-ret-c.d +++ b/gas/testsuite/gas/i386/lfence-ret-c.d @@ -1,7 +1,7 @@ #source: lfence-ret.s #as: -mlfence-before-ret=or -mlfence-before-indirect-branch=all #objdump: -dw - +#name -mlfence-before-ret=or -mlfence-before-indirect-branch=all .*: +file format .* @@ -20,16 +20,4 @@ Disassembly of section .text: +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: c2 1e 00 ret \$0x1e - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 #pass diff --git a/gas/testsuite/gas/i386/lfence-ret-d.d b/gas/testsuite/gas/i386/lfence-ret-d.d index 03f8f88fd7b..9078216e53e 100644 --- a/gas/testsuite/gas/i386/lfence-ret-d.d +++ b/gas/testsuite/gas/i386/lfence-ret-d.d @@ -21,16 +21,4 @@ Disassembly of section .text: +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: c2 1e 00 ret \$0x1e - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 #pass diff --git a/gas/testsuite/gas/i386/lfence-ret.s b/gas/testsuite/gas/i386/lfence-ret.s index f27fa5839e5..5de4f08447e 100644 --- a/gas/testsuite/gas/i386/lfence-ret.s +++ b/gas/testsuite/gas/i386/lfence-ret.s @@ -4,7 +4,3 @@ _start: retw $20 ret ret $30 - lretw - lretw $40 - lret - lret $40 diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret-a.d b/gas/testsuite/gas/i386/x86-64-lfence-ret-a.d index 345217b17c7..96881677b63 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret-a.d +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret-a.d @@ -1,6 +1,5 @@ #source: x86-64-lfence-ret.s #as: -mlfence-before-ret=or -#warning_output: x86-64-lfence-ret.e #objdump: -dw -Mintel64 #name: x86-64 -mlfence-before-ret=or @@ -28,22 +27,4 @@ Disassembly of section .text: +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28 - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 - +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 cb lretq - +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 ca 28 00 lretq \$0x28 #pass diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret-b.d b/gas/testsuite/gas/i386/x86-64-lfence-ret-b.d index 3947660fea8..4afad79bc64 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret-b.d +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret-b.d @@ -1,6 +1,5 @@ #source: x86-64-lfence-ret.s #as: -mlfence-before-ret=not -#warning_output: x86-64-lfence-ret.e #objdump: -dw -Mintel64 #name: x86-64 -mlfence-before-ret=not @@ -34,28 +33,4 @@ Disassembly of section .text: +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28 - +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\) - +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\) - +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: f7 14 24 notl \(%rsp\) - +[a-f0-9]+: f7 14 24 notl \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: f7 14 24 notl \(%rsp\) - +[a-f0-9]+: f7 14 24 notl \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 - +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\) - +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 cb lretq - +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\) - +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 ca 28 00 lretq \$0x28 #pass diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret-c.d b/gas/testsuite/gas/i386/x86-64-lfence-ret-c.d index cd89a95bc43..55b0ecb2f02 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret-c.d +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret-c.d @@ -1,6 +1,5 @@ #source: x86-64-lfence-ret.s #as: -mlfence-before-ret=or -mlfence-before-indirect-branch=all -#warning_output: x86-64-lfence-ret.e #objdump: -dw -Mintel64 .*: +file format .* @@ -27,22 +26,4 @@ Disassembly of section .text: +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28 - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 - +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 cb lretq - +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 ca 28 00 lretq \$0x28 #pass diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret-d.d b/gas/testsuite/gas/i386/x86-64-lfence-ret-d.d index 593b8894359..efe928aceed 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret-d.d +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret-d.d @@ -1,6 +1,5 @@ #source: x86-64-lfence-ret.s #as: -mlfence-before-ret=shl -#warning_output: x86-64-lfence-ret.e #objdump: -dw -Mintel64 #name: x86-64 -mlfence-before-ret=shl @@ -28,22 +27,4 @@ Disassembly of section .text: +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28 - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 - +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 cb lretq - +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 ca 28 00 lretq \$0x28 #pass diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret-e.d b/gas/testsuite/gas/i386/x86-64-lfence-ret-e.d index b4d229654cd..31286662de6 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret-e.d +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret-e.d @@ -1,6 +1,5 @@ #source: x86-64-lfence-ret.s #as: -mlfence-before-ret=shl -#warning_output: x86-64-lfence-ret.e #objdump: -dw -Mintel64 #name: x86-64 -mlfence-before-ret=yes @@ -28,22 +27,4 @@ Disassembly of section .text: +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) +[a-f0-9]+: 0f ae e8 lfence +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28 - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 cb lretw - +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 66 ca 28 00 lretw \$0x28 - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: cb lret - +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: ca 28 00 lret \$0x28 - +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 cb lretq - +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\) - +[a-f0-9]+: 0f ae e8 lfence - +[a-f0-9]+: 48 ca 28 00 lretq \$0x28 #pass diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret.e b/gas/testsuite/gas/i386/x86-64-lfence-ret.e deleted file mode 100644 index 13730e50e6f..00000000000 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret.e +++ /dev/null @@ -1,3 +0,0 @@ -.*: Assembler messages: -.*:??: Warning: no instruction mnemonic suffix given and no register operands; using default for `lret' -.*:??: Warning: no instruction mnemonic suffix given and no register operands; using default for `lret' diff --git a/gas/testsuite/gas/i386/x86-64-lfence-ret.s b/gas/testsuite/gas/i386/x86-64-lfence-ret.s index 986239c222e..dd0961a49c9 100644 --- a/gas/testsuite/gas/i386/x86-64-lfence-ret.s +++ b/gas/testsuite/gas/i386/x86-64-lfence-ret.s @@ -6,9 +6,3 @@ _start: ret $30 data16 rex.w ret data16 rex.w ret $40 - lretw - lretw $40 - lret - lret $40 - lretq - lretq $40 -- 2.30.2