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arm: Guard ucontext _rtld_global_ro access by SHARED, not PIC macro

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Due to PIE-by-default, PIC is now defined in more cases.  libc.a
does not have _rtld_global_ro, and statically linking setcontext
fails.  SHARED is the right condition to use, so that libc.a
references _dl_hwcap instead of _rtld_global_ro.

For static PIE support, the !SHARED case would still have to be made
PIC.  This patch does not achieve that.

Fixes commit 23645707f1
("Replace --enable-static-pie with --disable-default-pie").

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit ce1e5b1122)
This commit is contained in:
Florian Weimer 2021-12-17 11:48:41 +01:00
parent 4db172a54d
commit 93aabf891e
2 changed files with 4 additions and 4 deletions
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4
sysdeps/unix/sysv/linux/arm/getcontext.S
View File

@ -50,7 +50,7 @@ ENTRY(__getcontext)
/* Store FP regs. Much of the FP code is copied from arm/setjmp.S. */
#ifdef PIC
#ifdef SHARED
ldr r2, 1f
ldr r1, .Lrtld_global_ro
0: add r2, pc, r2
@ -102,7 +102,7 @@ ENTRY(__getcontext)
END(__getcontext)
#ifdef PIC
#ifdef SHARED
1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
.Lrtld_global_ro:
.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)

4
sysdeps/unix/sysv/linux/arm/setcontext.S
View File

@ -32,7 +32,7 @@ ENTRY(__setcontext)
add r0, r0, #UCONTEXT_REGSPACE
/* Restore the VFP registers. Copied from arm/__longjmp.S. */
#ifdef PIC
#ifdef SHARED
ldr r2, 1f
ldr r1, .Lrtld_global_ro
0: add r2, pc, r2
@ -101,7 +101,7 @@ ENTRY(__startcontext)
.fnend
END(__startcontext)
#ifdef PIC
#ifdef SHARED
1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
.Lrtld_global_ro:
.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)