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powerpc: Don't allow the use of EMIT_BUG_ENTRY with BUGFLAG_WARNING 

Warnings in assembly must use EMIT_WARN_ENTRY in order to generate
the necessary entry in exception table.

Check in EMIT_BUG_ENTRY that flags don't include BUGFLAG_WARNING.

This change avoids problems like the one fixed by
commit fd1eaaaaa6 ("powerpc/64s: Use EMIT_WARN_ENTRY for SRR debug
warnings").

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ddcb422102a37eb45f57694c7ef0ec6187964dff.1644742951.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-02-13 10:02:41 +01:00 committed by Michael Ellerman
parent 5a72345e6a
commit 38a1756861
1 changed files with 10 additions and 3 deletions
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13
arch/powerpc/include/asm/bug.h
View File

@ -11,7 +11,7 @@
#ifdef __ASSEMBLY__
#include <asm/asm-offsets.h>
#ifdef CONFIG_DEBUG_BUGVERBOSE
.macro EMIT_BUG_ENTRY addr,file,line,flags
.macro __EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw"
5001: .4byte \addr - 5001b, 5002f - 5001b
.short \line, \flags
@ -22,7 +22,7 @@
.previous
.endm
#else
.macro EMIT_BUG_ENTRY addr,file,line,flags
.macro __EMIT_BUG_ENTRY addr,file,line,flags
.section __bug_table,"aw"
5001: .4byte \addr - 5001b
.short \flags
@ -33,7 +33,14 @@
.macro EMIT_WARN_ENTRY addr,file,line,flags
EX_TABLE(\addr,\addr+4)
EMIT_BUG_ENTRY \addr,\file,\line,\flags
__EMIT_BUG_ENTRY \addr,\file,\line,\flags
.endm
.macro EMIT_BUG_ENTRY addr,file,line,flags
.if \flags & 1 /* BUGFLAG_WARNING */
.err /* Use EMIT_WARN_ENTRY for warnings */
.endif
__EMIT_BUG_ENTRY \addr,\file,\line,\flags
.endm
#else /* !__ASSEMBLY__ */