diff options
| author | Jordan Niethe <jniethe5@gmail.com> | 2020-12-01 03:52:03 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 17:01:20 +0300 |
| commit | 1baa1f70ef77c4447628992ad50ab83213e2eb6c (patch) | |
| tree | dc73617903cec66860d6f44d6e528b24325c5843 /arch/powerpc | |
| parent | f3e90408019b353fd1fcd338091fb8d3c4a1c1a5 (diff) | |
| download | linux-1baa1f70ef77c4447628992ad50ab83213e2eb6c.tar.xz | |
powerpc: Allow relative pointers in bug table entries
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
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/bug.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/xmon/xmon.c | 4 |
3 files changed, 10 insertions, 6 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8d12da224cb9..9e679ba0811c 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -313,6 +313,10 @@ config GENERIC_BUG default y depends on BUG +config GENERIC_BUG_RELATIVE_POINTERS + def_bool y + depends on GENERIC_BUG + config SYS_SUPPORTS_APM_EMULATION default y if PMAC_APM_EMU bool diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h index 338f36cd9934..ba0500872cce 100644 --- a/arch/powerpc/include/asm/bug.h +++ b/arch/powerpc/include/asm/bug.h @@ -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" diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 5559edf36756..dcd817ca2edf 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -1747,9 +1747,9 @@ static void print_bug_trap(struct pt_regs *regs) #ifdef CONFIG_DEBUG_BUGVERBOSE printf("kernel BUG at %s:%u!\n", - bug->file, bug->line); + (char *)bug + bug->file_disp, bug->line); #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 /* CONFIG_BUG */ } |