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powerpc: Allow relative pointers in bug table entries

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This enables GENERIC_BUG_RELATIVE_POINTERS on Power so that 32-bit
offsets are stored in the bug entries rather than 64-bit pointers.
While this doesn't save space for 32-bit machines, use it anyway so
there is only one code path.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201201005203.15210-1-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe
2020-12-01 11:52:03 +11:00
committed by Michael Ellerman
parent f3e9040801
commit 1baa1f70ef
3 changed files with 10 additions and 6 deletions
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8
arch/powerpc/include/asm/bug.h
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@@ -12,7 +12,7 @@
#ifdef CONFIG_DEBUG_BUGVERBOSE
.macro EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw"
5001: PPC_LONG \addr, 5002f
5001: .4byte \addr - 5001b, 5002f - 5001b
.short \line, \flags
.org 5001b+BUG_ENTRY_SIZE
.previous
@@ -23,7 +23,7 @@
#else
.macro EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw"
5001: PPC_LONG \addr
5001: .4byte \addr - 5001b
.short \flags
.org 5001b+BUG_ENTRY_SIZE
.previous
@@ -36,14 +36,14 @@
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \
"2:\t" PPC_LONG "1b, %0\n" \
"2:\t.4byte 1b - 2b, %0 - 2b\n" \
"\t.short %1, %2\n" \
".org 2b+%3\n" \
".previous\n"
#else
#define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \
"2:\t" PPC_LONG "1b\n" \
"2:\t.4byte 1b - 2b\n" \
"\t.short %2\n" \
".org 2b+%3\n" \
".previous\n"