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x86: Resolve PLT32 reloc aganst local symbol to section

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Since PLT entry isn't needed for branch to local symbol, we can resolve
R_386_PLT32/R_X86_64_PLT32 relocation aganst local symbol to section,
similar to R_386_PC32/R_X86_64_PC32.

2020-02-13  Fangrui Song   <maskray@google.com>
	    H.J. Lu  <hongjiu.lu@intel.com>

	PR gas/25551
	* config/tc-i386.c (tc_i386_fix_adjustable): Don't check
	BFD_RELOC_386_PLT32 nor BFD_RELOC_X86_64_PLT32.
	* testsuite/gas/i386/i386.exp: Run relax-5 and x86-64-relax-4.
	* testsuite/gas/i386/relax-5.d: New file.
	* testsuite/gas/i386/relax-5.s: Likewise.
	* testsuite/gas/i386/x86-64-relax-4.d: Likewise.
	* testsuite/gas/i386/x86-64-relax-4.s: Likewise.
This commit is contained in:
H.J. Lu 2020-02-13 13:44:17 -08:00
parent feacfcacaa
commit 292676c15a
7 changed files with 62 additions and 2 deletions
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12
gas/ChangeLog
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@ -1,3 +1,15 @@
2020-02-13 Fangrui Song <maskray@google.com>
H.J. Lu <hongjiu.lu@intel.com>
PR gas/25551
* config/tc-i386.c (tc_i386_fix_adjustable): Don't check
BFD_RELOC_386_PLT32 nor BFD_RELOC_X86_64_PLT32.
* testsuite/gas/i386/i386.exp: Run relax-5 and x86-64-relax-4.
* testsuite/gas/i386/relax-5.d: New file.
* testsuite/gas/i386/relax-5.s: Likewise.
* testsuite/gas/i386/x86-64-relax-4.d: Likewise.
* testsuite/gas/i386/x86-64-relax-4.s: Likewise.
2020-02-13 Jan Beulich <jbeulich@suse.com>
* config/tc-i386.c (cpu_noarch): Use CPU_ANY_SSE4_FLAGS in

2
gas/config/tc-i386.c
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@ -3398,7 +3398,6 @@ tc_i386_fix_adjustable (fixS *fixP ATTRIBUTE_UNUSED)
if (fixP->fx_r_type == BFD_RELOC_SIZE32
|| fixP->fx_r_type == BFD_RELOC_SIZE64
|| fixP->fx_r_type == BFD_RELOC_386_GOTOFF
|| fixP->fx_r_type == BFD_RELOC_386_PLT32
|| fixP->fx_r_type == BFD_RELOC_386_GOT32
|| fixP->fx_r_type == BFD_RELOC_386_GOT32X
|| fixP->fx_r_type == BFD_RELOC_386_TLS_GD
@ -3411,7 +3410,6 @@ tc_i386_fix_adjustable (fixS *fixP ATTRIBUTE_UNUSED)
|| fixP->fx_r_type == BFD_RELOC_386_TLS_LE
|| fixP->fx_r_type == BFD_RELOC_386_TLS_GOTDESC
|| fixP->fx_r_type == BFD_RELOC_386_TLS_DESC_CALL
|| fixP->fx_r_type == BFD_RELOC_X86_64_PLT32
|| fixP->fx_r_type == BFD_RELOC_X86_64_GOT32
|| fixP->fx_r_type == BFD_RELOC_X86_64_GOTPCREL
|| fixP->fx_r_type == BFD_RELOC_X86_64_GOTPCRELX

2
gas/testsuite/gas/i386/i386.exp
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@ -580,6 +580,7 @@ if [expr ([istarget "i*86-*-*"] || [istarget "x86_64-*-*"]) && [gas_32_check]]
run_dump_test "relax-3"
run_dump_test "relax-4"
run_dump_test "relax-5"
run_dump_test "got"
run_dump_test "got-no-relax"
@ -1135,6 +1136,7 @@ if [expr ([istarget "i*86-*-*"] || [istarget "x86_64-*-*"]) && [gas_64_check]] t
run_dump_test "x86-64-relax-2"
run_dump_test "x86-64-relax-3"
run_dump_test "x86-64-relax-4"
run_dump_test "x86-64-jump"
run_dump_test "x86-64-branch-2"

15
gas/testsuite/gas/i386/relax-5.d Normal file
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@ -0,0 +1,15 @@
#objdump: -dwr
.*: +file format .*
Disassembly of section .text:
0+ <printk>:
+[a-f0-9]+: c3 ret
Disassembly of section .init.text:
0+ <foo>:
+[a-f0-9]+: e8 fb ff ff ff call 0 <foo> 1: R_386_PLT32 .text
+[a-f0-9]+: e8 fc ff ff ff call 6 <foo\+0x6> 6: R_386_PC32 .text
#pass

8
gas/testsuite/gas/i386/relax-5.s Normal file
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@ -0,0 +1,8 @@
.section .init.text,"ax",@progbits
.global foo
foo:
call printk@PLT
call printk
.text
printk:
ret

17
gas/testsuite/gas/i386/x86-64-relax-4.d Normal file
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@ -0,0 +1,17 @@
#objdump: -drw
#notarget: *-*-solaris*
.*: +file format .*
Disassembly of section .text:
0+ <printk>:
+[a-f0-9]+: c3 retq
Disassembly of section .init.text:
0+ <foo>:
+[a-f0-9]+: e8 00 00 00 00 callq 5 <foo\+0x5> 1: R_X86_64_PLT32 .text-0x4
+[a-f0-9]+: 48 8d 05 00 00 00 00 lea 0x0\(%rip\),%rax # c <foo\+0xc> 8: R_X86_64_PC32 .text-0x4
#pass

8
gas/testsuite/gas/i386/x86-64-relax-4.s Normal file
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@ -0,0 +1,8 @@
.section .init.text,"ax",@progbits
.global foo
foo:
call printk
lea printk(%rip), %rax
.text
printk:
ret