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| author | Paul Burton <paul.burton@mips.com> | 2018-11-08 23:14:38 +0300 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-11-09 21:23:19 +0300 |
| commit | 378ed6f0e3c525e3b12827e7b7fb0a078ee48a32 (patch) | |
| tree | 766bb2bdd18f7aa7fce8a9ccb428cfcad8cf2feb /arch/mips/include/asm/local.h | |
| parent | 183b40f992c8f98082c4d72043ecdeba0e6a4367 (diff) | |
| download | linux-378ed6f0e3c525e3b12827e7b7fb0a078ee48a32.tar.xz | |
MIPS: Avoid using .set mips0 to restore ISA
We currently have 2 commonly used methods for switching ISA within
assembly code, then restoring the original ISA.
1) Using a pair of .set push & .set pop directives. For example:
.set push
.set mips32r2
<some_insn>
.set pop
2) Using .set mips0 to restore the ISA originally specified on the
command line. For example:
.set mips32r2
<some_insn>
.set mips0
Unfortunately method 2 does not work with nanoMIPS toolchains, where the
assembler rejects the .set mips0 directive like so:
Error: cannot change ISA from nanoMIPS to mips0
In preparation for supporting nanoMIPS builds, switch all instances of
method 2 in generic non-platform-specific code to use push & pop as in
method 1 instead. The .set push & .set pop is arguably cleaner anyway,
and if nothing else it's good to consistently use one method.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21037/
Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips/include/asm/local.h')
| -rw-r--r-- | arch/mips/include/asm/local.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h index ac8264eca1e9..02783e141c32 100644 --- a/arch/mips/include/asm/local.h +++ b/arch/mips/include/asm/local.h @@ -35,13 +35,14 @@ static __inline__ long local_add_return(long i, local_t * l) unsigned long temp; __asm__ __volatile__( + " .set push \n" " .set arch=r4000 \n" "1:" __LL "%1, %2 # local_add_return \n" " addu %0, %1, %3 \n" __SC "%0, %2 \n" " beqzl %0, 1b \n" " addu %0, %1, %3 \n" - " .set mips0 \n" + " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); @@ -49,13 +50,14 @@ static __inline__ long local_add_return(long i, local_t * l) unsigned long temp; __asm__ __volatile__( + " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" "1:" __LL "%1, %2 # local_add_return \n" " addu %0, %1, %3 \n" __SC "%0, %2 \n" " beqz %0, 1b \n" " addu %0, %1, %3 \n" - " .set mips0 \n" + " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); @@ -80,13 +82,14 @@ static __inline__ long local_sub_return(long i, local_t * l) unsigned long temp; __asm__ __volatile__( + " .set push \n" " .set arch=r4000 \n" "1:" __LL "%1, %2 # local_sub_return \n" " subu %0, %1, %3 \n" __SC "%0, %2 \n" " beqzl %0, 1b \n" " subu %0, %1, %3 \n" - " .set mips0 \n" + " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); @@ -94,13 +97,14 @@ static __inline__ long local_sub_return(long i, local_t * l) unsigned long temp; __asm__ __volatile__( + " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" "1:" __LL "%1, %2 # local_sub_return \n" " subu %0, %1, %3 \n" __SC "%0, %2 \n" " beqz %0, 1b \n" " subu %0, %1, %3 \n" - " .set mips0 \n" + " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); |