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authorDavid Gibson <david@gibson.dropbear.id.au>2005-10-27 16:27:25 +1000
committerPaul Mackerras <paulus@samba.org>2005-10-27 20:48:50 +1000
commit25c8a78b1e00ac0cc640677eda78b462c2cd4c6e (patch)
treea0044f8b2b557799a8cb3346b590fcd3a8507ed7 /include
parentfda262b8978d0089758ef9444508434c74113a61 (diff)
[PATCH] powerpc: Fix handling of fpscr on 64-bit
The recent merge of fpu.S broken the handling of fpscr for ARCH=powerpc and CONFIG_PPC64=y. FP registers could be corrupted, leading to strange random application crashes. The confusion arises, because the thread_struct has (and requires) a 64-bit area to save the fpscr, because we use load/store double instructions to get it in to/out of the FPU. However, only the low 32-bits are actually used, so we want to treat it as a 32-bit quantity when manipulating its bits to avoid extra load/stores on 32-bit. This patch replaces the current definition with a structure of two 32-bit quantities (pad and val), to clarify things as much as is possible. The 'val' field is used when manipulating bits, the structure itself is used when obtaining the address for loading/unloading the value from the FPU. While we're at it, consolidate the 4 (!) almost identical versions of cvt_fd() and cvt_df() (arch/ppc/kernel/misc.S, arch/ppc64/kernel/misc.S, arch/powerpc/kernel/misc_32.S, arch/powerpc/kernel/misc_64.S) into a single version in fpu.S. The new version takes a pointer to thread_struct and applies the correct offset itself, rather than a pointer to the fpscr field itself, again to avoid confusion as to which is the correct field to use. Finally, this patch makes ARCH=ppc64 also use the consolidated fpu.S code, which it previously did not. Built for G5 (ARCH=ppc64 and ARCH=powerpc), 32-bit powermac (ARCH=ppc and ARCH=powerpc) and Walnut (ARCH=ppc, CONFIG_MATH_EMULATION=y). Booted on G5 (ARCH=powerpc) and things which previously fell over no longer do. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-powerpc/processor.h11
-rw-r--r--include/asm-powerpc/system.h4
-rw-r--r--include/asm-ppc/system.h4
-rw-r--r--include/asm-ppc64/system.h4
4 files changed, 12 insertions, 11 deletions
diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index 9592f533e05..eee954a001f 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -162,10 +162,11 @@ struct thread_struct {
unsigned long dbcr1;
#endif
double fpr[32]; /* Complete floating point set */
-#ifdef CONFIG_PPC32
- unsigned long fpscr_pad; /* fpr ... fpscr must be contiguous */
-#endif
- unsigned long fpscr; /* Floating point status */
+ struct { /* fpr ... fpscr must be contiguous */
+
+ unsigned int pad;
+ unsigned int val; /* Floating point status */
+ } fpscr;
int fpexc_mode; /* floating-point exception mode */
#ifdef CONFIG_PPC64
unsigned long start_tb; /* Start purr when proc switched in */
@@ -207,7 +208,7 @@ struct thread_struct {
.regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
.fs = KERNEL_DS, \
.fpr = {0}, \
- .fpscr = 0, \
+ .fpscr = { .val = 0, }, \
.fpexc_mode = MSR_FE0|MSR_FE1, \
}
#endif
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index d60c8c92892..e926e43c4ae 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -132,8 +132,8 @@ extern int emulate_altivec(struct pt_regs *);
extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *);
extern int fix_alignment(struct pt_regs *);
-extern void cvt_fd(float *from, double *to, unsigned long *fpscr);
-extern void cvt_df(double *from, float *to, unsigned long *fpscr);
+extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
+extern void cvt_df(double *from, float *to, struct thread_struct *thread);
#ifdef CONFIG_ALTIVEC
extern void flush_altivec_to_thread(struct task_struct *);
diff --git a/include/asm-ppc/system.h b/include/asm-ppc/system.h
index 1f310783757..eb30c09516a 100644
--- a/include/asm-ppc/system.h
+++ b/include/asm-ppc/system.h
@@ -82,8 +82,8 @@ extern int emulate_altivec(struct pt_regs *);
extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *);
extern int fix_alignment(struct pt_regs *);
-extern void cvt_fd(float *from, double *to, unsigned long *fpscr);
-extern void cvt_df(double *from, float *to, unsigned long *fpscr);
+extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
+extern void cvt_df(double *from, float *to, struct thread_struct *thread);
#ifdef CONFIG_ALTIVEC
extern void flush_altivec_to_thread(struct task_struct *);
diff --git a/include/asm-ppc64/system.h b/include/asm-ppc64/system.h
index 2e17ef7dbeb..fd7c1f890c4 100644
--- a/include/asm-ppc64/system.h
+++ b/include/asm-ppc64/system.h
@@ -120,8 +120,8 @@ extern void giveup_altivec(struct task_struct *);
extern void disable_kernel_altivec(void);
extern void enable_kernel_altivec(void);
extern int emulate_altivec(struct pt_regs *);
-extern void cvt_fd(float *from, double *to, unsigned long *fpscr);
-extern void cvt_df(double *from, float *to, unsigned long *fpscr);
+extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
+extern void cvt_df(double *from, float *to, struct thread_struct *thread);
#ifdef CONFIG_ALTIVEC
extern void flush_altivec_to_thread(struct task_struct *);