2018-08-09 21:43:22 +08:00
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# REQUIRES: x86
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# RUN: llvm-mc -triple i686-pc-win32 %s -filetype=obj -o %t.obj
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[COFF] Implement /safeseh:no and check @feat.00 flags by default
Summary:
Fixes PR41828. Before this, LLD always emitted SafeSEH chunks and
defined __safe_se_handler_table & size. Now, /safeseh:no leaves those
undefined.
Additionally, we were checking for the safeseh @feat.00 flag in two
places: once to emit errors, and once during safeseh table construction.
The error was set up to be off by default, but safeseh is supposed to be
on by default. I combined the two checks, so now LLD emits an error if
an input object lacks @feat.00 and safeseh is enabled. This caused the
majority of 32-bit LLD tests to fail, since many test input object files
lack @feat.00 symbols. I explicitly added -safeseh:no to those tests to
preserve behavior.
Finally, LLD no longer sets IMAGE_DLL_CHARACTERISTICS_NO_SEH if any
input file wasn't compiled for safeseh.
Reviewers: mstorsjo, ruiu, thakis
Reviewed By: ruiu, thakis
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D63570
llvm-svn: 366238
2019-07-17 02:17:33 +08:00
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# RUN: lld-link -safeseh:no %t.obj -guard:cf -out:%t.exe -entry:main
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2019-05-01 13:49:01 +08:00
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# RUN: llvm-readobj --coff-load-config %t.exe | FileCheck %s --check-prefix=CHECK
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2018-08-09 21:43:22 +08:00
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# Only f and _main should go in the table.
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# (use /lldmap:map.txt to check their addresses).
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#
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# CHECK: GuardFidTable [
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# CHECK-NEXT: 0x401000
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# CHECK-NEXT: 0x401030
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# CHECK-NEXT: ]
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# The input was loosly based on studying this program:
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#
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# void foo() { return; }
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# void bar() { return; }
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# int main() {
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# foo();
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# void (*arr[])() = { &bar };
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# (*arr[0])();
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# return 0;
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# }
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# cl /c a.cc && dumpbin /disasm a.obj > a.txt &&
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# link a.obj /guard:cf /map:map.txt && dumpbin /loadconfig a.exe
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.def f;
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.scl 3;
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.type 32;
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.endef
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.section .text,"xr",one_only,f
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.p2align 4
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f: movl $1, %eax
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ret
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.def g;
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.scl 3;
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.type 32;
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.endef
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.section .text,"xr",one_only,g
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.p2align 4
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g: movl $2, %eax
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ret
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.def label;
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.scl 6; # StorageClass: Label
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.type 0; # Type: Not a function.
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.endef
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.section .text,"xr",one_only,label
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.p2align 4
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label: ret
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.data
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.globl fp
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.p2align 4
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fp: .long f # DIR32 relocation to function
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.long label # DIR32 relocation to label
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.def _main;
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.scl 2;
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.type 32;
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.endef
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.section .text,"xr",one_only,_main
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.globl _main
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.p2align 4
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_main: call *fp # DIR32 relocation to data
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call g # REL32 relocation to function
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ret
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# Load configuration directory entry (winnt.h _IMAGE_LOAD_CONFIG_DIRECTORY32).
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# The linker will define the ___guard_* symbols.
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.section .rdata,"dr"
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.globl __load_config_used
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__load_config_used:
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.long 104 # Size.
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.fill 76, 1, 0
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.long ___guard_fids_table
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.long ___guard_fids_count
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.long ___guard_flags
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.fill 12, 1, 0
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