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powerpc: Refactor BUG/WARN macros

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BUG(), WARN() and friends are using a similar inline assembly to
implement various traps with various flags.

Lets refactor via a new BUG_ENTRY() macro.

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/c19a82b37677ace0eebb0dc8c2120373c29c8dd1.1566219503.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-19 13:06:30 +00:00 committed by Michael Ellerman
parent 98ba8e8013
commit 43f003bb74
1 changed files with 15 additions and 26 deletions
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41
arch/powerpc/include/asm/bug.h
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@ -49,6 +49,15 @@
".previous\n"
#endif
#define BUG_ENTRY(insn, flags, ...) \
__asm__ __volatile__( \
"1: " insn "\n" \
_EMIT_BUG_ENTRY \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (flags), \
"i" (sizeof(struct bug_entry)), \
##__VA_ARGS__)
/*
* BUG_ON() and WARN_ON() do their best to cooperate with compile-time
* optimisations. However depending on the complexity of the condition
@ -56,11 +65,7 @@
*/
#define BUG() do { \
__asm__ __volatile__( \
"1: twi 31,0,0\n" \
_EMIT_BUG_ENTRY \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (0), "i" (sizeof(struct bug_entry))); \
BUG_ENTRY("twi 31, 0, 0", 0); \
unreachable(); \
} while (0)
@ -69,23 +74,11 @@
if (x) \
BUG(); \
} else { \
__asm__ __volatile__( \
"1: "PPC_TLNEI" %4,0\n" \
_EMIT_BUG_ENTRY \
: : "i" (__FILE__), "i" (__LINE__), "i" (0), \
"i" (sizeof(struct bug_entry)), \
"r" ((__force long)(x))); \
BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
} \
} while (0)
#define __WARN_FLAGS(flags) do { \
__asm__ __volatile__( \
"1: twi 31,0,0\n" \
_EMIT_BUG_ENTRY \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (BUGFLAG_WARNING|(flags)), \
"i" (sizeof(struct bug_entry))); \
} while (0)
#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
#define WARN_ON(x) ({ \
int __ret_warn_on = !!(x); \
@ -93,13 +86,9 @@
if (__ret_warn_on) \
__WARN(); \
} else { \
__asm__ __volatile__( \
"1: "PPC_TLNEI" %4,0\n" \
_EMIT_BUG_ENTRY \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (BUGFLAG_WARNING|BUGFLAG_TAINT(TAINT_WARN)),\
"i" (sizeof(struct bug_entry)), \
"r" (__ret_warn_on)); \
BUG_ENTRY(PPC_TLNEI " %4, 0", \
BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
"r" (__ret_warn_on)); \
} \
unlikely(__ret_warn_on); \
})