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commit 93aabf891e96e93f100081ee07989c23d7107d17
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Dec 17 11:48:41 2021 +0100
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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
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does not have _rtld_global_ro, and statically linking setcontext
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fails. SHARED is the right condition to use, so that libc.a
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references _dl_hwcap instead of _rtld_global_ro.
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For static PIE support, the !SHARED case would still have to be made
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PIC. This patch does not achieve that.
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Fixes commit 23645707f12f2dd9d80b51effb2d9618a7b65565
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("Replace --enable-static-pie with --disable-default-pie").
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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(cherry picked from commit ce1e5b11229f19820b86f8b19d651f16009552b0)
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diff --git a/sysdeps/unix/sysv/linux/arm/getcontext.S b/sysdeps/unix/sysv/linux/arm/getcontext.S
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index 3aa581c4da6d1166..11bfcbe5f53afc6e 100644
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--- a/sysdeps/unix/sysv/linux/arm/getcontext.S
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+++ b/sysdeps/unix/sysv/linux/arm/getcontext.S
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@@ -50,7 +50,7 @@ ENTRY(__getcontext)
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/* Store FP regs. Much of the FP code is copied from arm/setjmp.S. */
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-#ifdef PIC
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+#ifdef SHARED
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ldr r2, 1f
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ldr r1, .Lrtld_global_ro
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0: add r2, pc, r2
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@@ -102,7 +102,7 @@ ENTRY(__getcontext)
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END(__getcontext)
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-#ifdef PIC
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+#ifdef SHARED
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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diff --git a/sysdeps/unix/sysv/linux/arm/setcontext.S b/sysdeps/unix/sysv/linux/arm/setcontext.S
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index 8be8beefea13883e..4c7c6e550944138c 100644
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--- a/sysdeps/unix/sysv/linux/arm/setcontext.S
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+++ b/sysdeps/unix/sysv/linux/arm/setcontext.S
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@@ -32,7 +32,7 @@ ENTRY(__setcontext)
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add r0, r0, #UCONTEXT_REGSPACE
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/* Restore the VFP registers. Copied from arm/__longjmp.S. */
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-#ifdef PIC
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+#ifdef SHARED
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ldr r2, 1f
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ldr r1, .Lrtld_global_ro
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0: add r2, pc, r2
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@@ -101,7 +101,7 @@ ENTRY(__startcontext)
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.fnend
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END(__startcontext)
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-#ifdef PIC
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+#ifdef SHARED
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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