I think the original intention is to enable FPU, read the
FPU id register and restore original FPU state. Unfortnately
restore_flags() does not achieve it.
Following patch fixes that. Applies to both 2.4 and 2.5 branch.
Jun
P.S., I am still waiting for comments or check-in of the following
patches:
020417.kgdb-compile-warning.patch
020722.malta-kgdb
020826.swarm-rtc-m41t81.patch
diff -Nru link/arch/mips/kernel/ptrace.c.orig link/arch/mips/kernel/ptrace.c
--- link/arch/mips/kernel/ptrace.c.orig Fri Aug 9 09:38:10 2002
+++ link/arch/mips/kernel/ptrace.c Mon Sep 16 14:22:27 2002
@@ -168,10 +168,10 @@
break;
}
- __save_flags(flags);
+ flags = read_32bit_cp0_register(CP0_STATUS);
__enable_fpu();
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
- __restore_flags(flags);
+ write_32bit_cp0_register(CP0_STATUS, flags);
break;
}
default:
diff -Nru link/arch/mips64/kernel/ptrace.c.orig link/arch/mips64/kernel/ptrace.c
--- link/arch/mips64/kernel/ptrace.c.orig Fri Aug 9 09:38:19 2002
+++ link/arch/mips64/kernel/ptrace.c Mon Sep 16 14:24:02 2002
@@ -165,10 +165,10 @@
break;
case FPC_EIR: { /* implementation / version register */
unsigned int flags;
- __save_flags(flags);
+ flags = read_32bit_cp0_register(CP0_STATUS);
__enable_fpu();
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
- __restore_flags(flags);
+ write_32bit_cp0_register(CP0_STATUS, flags);
break;
}
default:
