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Protect manipulation of c0_status against preemption and multithreading.

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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2005-10-06 17:39:32 +01:00
parent 8afcb5d829
commit 101b3531a6
2 changed files with 47 additions and 12 deletions
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20
arch/mips/kernel/ptrace32.c
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@@ -29,6 +29,7 @@
#include <asm/dsp.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
@@ -191,10 +192,21 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
if (!cpu_has_fpu)
break;
flags = read_c0_status();
__enable_fpu();
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
write_c0_status(flags);
preempt_disable();
if (cpu_has_mipsmt) {
unsigned int vpflags = dvpe();
flags = read_c0_status();
__enable_fpu();
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
write_c0_status(flags);
evpe(vpflags);
} else {
flags = read_c0_status();
__enable_fpu();
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
write_c0_status(flags);
}
preempt_enable();
break;
}
case DSP_BASE ... DSP_BASE + 5: