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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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4
arch/powerpc/Kconfig
View File

@ -313,6 +313,10 @@ config GENERIC_BUG
default y default y
depends on BUG depends on BUG
config GENERIC_BUG_RELATIVE_POINTERS
def_bool y
depends on GENERIC_BUG
config SYS_SUPPORTS_APM_EMULATION config SYS_SUPPORTS_APM_EMULATION
default y if PMAC_APM_EMU default y if PMAC_APM_EMU
bool bool

8
arch/powerpc/include/asm/bug.h
View File

@ -12,7 +12,7 @@
#ifdef CONFIG_DEBUG_BUGVERBOSE #ifdef CONFIG_DEBUG_BUGVERBOSE
.macro EMIT_BUG_ENTRY addr,file,line,flags .macro EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw" .section __bug_table,"aw"
5001: PPC_LONG \addr, 5002f 5001: .4byte \addr - 5001b, 5002f - 5001b
.short \line, \flags .short \line, \flags
.org 5001b+BUG_ENTRY_SIZE .org 5001b+BUG_ENTRY_SIZE
.previous .previous
@ -23,7 +23,7 @@
#else #else
.macro EMIT_BUG_ENTRY addr,file,line,flags .macro EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw" .section __bug_table,"aw"
5001: PPC_LONG \addr 5001: .4byte \addr - 5001b
.short \flags .short \flags
.org 5001b+BUG_ENTRY_SIZE .org 5001b+BUG_ENTRY_SIZE
.previous .previous
@ -36,14 +36,14 @@
#ifdef CONFIG_DEBUG_BUGVERBOSE #ifdef CONFIG_DEBUG_BUGVERBOSE
#define _EMIT_BUG_ENTRY \ #define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \ ".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" \ "\t.short %1, %2\n" \
".org 2b+%3\n" \ ".org 2b+%3\n" \
".previous\n" ".previous\n"
#else #else
#define _EMIT_BUG_ENTRY \ #define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \ ".section __bug_table,\"aw\"\n" \
"2:\t" PPC_LONG "1b\n" \ "2:\t.4byte 1b - 2b\n" \
"\t.short %2\n" \ "\t.short %2\n" \
".org 2b+%3\n" \ ".org 2b+%3\n" \
".previous\n" ".previous\n"

4
arch/powerpc/xmon/xmon.c
View File

@ -1747,9 +1747,9 @@ static void print_bug_trap(struct pt_regs *regs)
#ifdef CONFIG_DEBUG_BUGVERBOSE #ifdef CONFIG_DEBUG_BUGVERBOSE
printf("kernel BUG at %s:%u!\n", printf("kernel BUG at %s:%u!\n",
bug->file, bug->line); (char *)bug + bug->file_disp, bug->line);
#else #else
printf("kernel BUG at %px!\n", (void *)bug->bug_addr); printf("kernel BUG at %px!\n", (void *)bug + bug->bug_addr_disp);
#endif #endif
#endif /* CONFIG_BUG */ #endif /* CONFIG_BUG */
} }