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powerpc/prom: convert PROM_BUG() to standard trap

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Prior to commit 1bd98d7fbaf5 ("ppc64: Update BUG handling based on
ppc32"), BUG() family was using BUG_ILLEGAL_INSTRUCTION which
was an invalid instruction opcode to trap into program check
exception.

That commit converted them to using standard trap instructions,
but prom/prom_init and their PROM_BUG() macro were left over.
head_64.S and exception-64s.S were left aside as well.

Convert them to using the standard BUG infrastructure.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/cdaf4bbbb64c288a077845846f04b12683f8875a.1566817807.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-26 11:10:23 +00:00 committed by Michael Ellerman
parent 405efc5980
commit 63ce271b5e
4 changed files with 7 additions and 12 deletions
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8
arch/powerpc/include/asm/bug.h
View File

@ -5,14 +5,6 @@
#include <asm/asm-compat.h>
/*
* Define an illegal instr to trap on the bug.
* We don't use 0 because that marks the end of a function
* in the ELF ABI. That's "Boo Boo" in case you wonder...
*/
#define BUG_OPCODE .long 0x00b00b00 /* For asm */
#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
#ifdef CONFIG_BUG
#ifdef __ASSEMBLY__

3
arch/powerpc/kernel/exceptions-64s.S
View File

@ -1467,7 +1467,8 @@ EXC_COMMON_BEGIN(fp_unavailable_common)
RECONCILE_IRQ_STATE(r10, r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl kernel_fp_unavailable_exception
BUG_OPCODE
0: trap
EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
1:
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
BEGIN_FTR_SECTION

6
arch/powerpc/kernel/head_64.S
View File

@ -182,7 +182,8 @@ __secondary_hold:
isync
bctr
#else
BUG_OPCODE
0: trap
EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
#endif
CLOSE_FIXED_SECTION(first_256B)
@ -998,7 +999,8 @@ start_here_common:
bl start_kernel
/* Not reached */
BUG_OPCODE
trap
EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
/*
* We put a few things here that have to be page-aligned.

2
arch/powerpc/kernel/prom_init.c
View File

@ -94,7 +94,7 @@ static int of_workarounds __prombss;
#define PROM_BUG() do { \
prom_printf("kernel BUG at %s line 0x%x!\n", \
__FILE__, __LINE__); \
__asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
__builtin_trap(); \
} while (0)
#ifdef DEBUG_PROM