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[SPARC64]: Need to clobber global reg vars in switch_to().

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Otherwise the compiler can't see the things like the
per-cpu area base register are changing.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-08-18 00:07:40 -07:00
parent 848c4dd515
commit 195f7fd0a7
2 changed files with 15 additions and 15 deletions
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4
include/asm-sparc64/percpu.h
View File

@ -3,6 +3,8 @@
#include <linux/compiler.h>
register unsigned long __local_per_cpu_offset asm("g5");
#ifdef CONFIG_SMP
#define setup_per_cpu_areas() do { } while (0)
@ -23,8 +25,6 @@ extern unsigned long __per_cpu_shift;
__typeof__(type) per_cpu__##name \
____cacheline_aligned_in_smp
register unsigned long __local_per_cpu_offset asm("g5");
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_cpu_offset))

26
include/asm-sparc64/system.h
View File

@ -141,7 +141,6 @@ do { \
* not preserve it's value. Hairy, but it lets us remove 2 loads
* and 2 stores in this critical code path. -DaveM
*/
#define EXTRA_CLOBBER ,"%l1"
#define switch_to(prev, next, last) \
do { if (test_thread_flag(TIF_PERFCTR)) { \
unsigned long __tmp; \
@ -164,33 +163,34 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \
"stx %%i6, [%%sp + 2047 + 0x70]\n\t" \
"stx %%i7, [%%sp + 2047 + 0x78]\n\t" \
"rdpr %%wstate, %%o5\n\t" \
"stx %%o6, [%%g6 + %3]\n\t" \
"stb %%o5, [%%g6 + %2]\n\t" \
"rdpr %%cwp, %%o5\n\t" \
"stx %%o6, [%%g6 + %6]\n\t" \
"stb %%o5, [%%g6 + %5]\n\t" \
"mov %1, %%g6\n\t" \
"ldub [%1 + %5], %%g1\n\t" \
"rdpr %%cwp, %%o5\n\t" \
"stb %%o5, [%%g6 + %8]\n\t" \
"mov %4, %%g6\n\t" \
"ldub [%4 + %8], %%g1\n\t" \
"wrpr %%g1, %%cwp\n\t" \
"ldx [%%g6 + %3], %%o6\n\t" \
"ldub [%%g6 + %2], %%o5\n\t" \
"ldub [%%g6 + %4], %%o7\n\t" \
"ldx [%%g6 + %6], %%o6\n\t" \
"ldub [%%g6 + %5], %%o5\n\t" \
"ldub [%%g6 + %7], %%o7\n\t" \
"wrpr %%o5, 0x0, %%wstate\n\t" \
"ldx [%%sp + 2047 + 0x70], %%i6\n\t" \
"ldx [%%sp + 2047 + 0x78], %%i7\n\t" \
"ldx [%%g6 + %6], %%g4\n\t" \
"ldx [%%g6 + %9], %%g4\n\t" \
"brz,pt %%o7, 1f\n\t" \
" mov %%g7, %0\n\t" \
"b,a ret_from_syscall\n\t" \
"1:\n\t" \
: "=&r" (last) \
: "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
"=r" (__local_per_cpu_offset) \
: "0" (task_thread_info(next)), \
"i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD), \
"i" (TI_CWP), "i" (TI_TASK) \
: "cc", \
"g1", "g2", "g3", "g7", \
"l2", "l3", "l4", "l5", "l6", "l7", \
"l1", "l2", "l3", "l4", "l5", "l6", "l7", \
"i0", "i1", "i2", "i3", "i4", "i5", \
"o0", "o1", "o2", "o3", "o4", "o5", "o7" EXTRA_CLOBBER);\
"o0", "o1", "o2", "o3", "o4", "o5", "o7"); \
/* If you fuck with this, update ret_from_syscall code too. */ \
if (test_thread_flag(TIF_PERFCTR)) { \
write_pcr(current_thread_info()->pcr_reg); \