powerpc: Define 32/64 bit asm macros and use them in fpu.S
These macros help in writing assembly code that works for both ppc32
and ppc64. With this we now have a common fpu.S. This takes out
load_up_fpu from head_64.S.
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/fpu.S b/arch/powerpc/kernel/fpu.S
index 665d7d3..04e95e8 100644
--- a/arch/powerpc/kernel/fpu.S
+++ b/arch/powerpc/kernel/fpu.S
@@ -27,13 +27,9 @@
* Load up this task's FP registers from its thread_struct,
* enable the FPU for the current task and return to the task.
*/
- .globl load_up_fpu
-load_up_fpu:
+_GLOBAL(load_up_fpu)
mfmsr r5
ori r5,r5,MSR_FP
-#ifdef CONFIG_PPC64BRIDGE
- clrldi r5,r5,1 /* turn off 64-bit mode */
-#endif /* CONFIG_PPC64BRIDGE */
SYNC
MTMSRD(r5) /* enable use of fpu now */
isync
@@ -43,67 +39,57 @@
* to another. Instead we call giveup_fpu in switch_to.
*/
#ifndef CONFIG_SMP
- tophys(r6,0) /* get __pa constant */
- addis r3,r6,last_task_used_math@ha
- lwz r4,last_task_used_math@l(r3)
- cmpwi 0,r4,0
+ LOADBASE(r3, last_task_used_math)
+ tophys(r3,r3)
+ LDL r4,OFF(last_task_used_math)(r3)
+ CMPI 0,r4,0
beq 1f
- add r4,r4,r6
+ tophys(r4,r4)
addi r4,r4,THREAD /* want last_task_used_math->thread */
SAVE_32FPRS(0, r4)
mffs fr0
stfd fr0,THREAD_FPSCR-4(r4)
- lwz r5,PT_REGS(r4)
- add r5,r5,r6
- lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
+ LDL r5,PT_REGS(r4)
+ tophys(r5,r5)
+ LDL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
li r10,MSR_FP|MSR_FE0|MSR_FE1
andc r4,r4,r10 /* disable FP for previous task */
- stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
+ STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
#endif /* CONFIG_SMP */
/* enable use of FP after return */
+#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG3 /* current task's THREAD (phys) */
lwz r4,THREAD_FPEXC_MODE(r5)
ori r9,r9,MSR_FP /* enable FP for current */
or r9,r9,r4
+#else
+ ld r4,PACACURRENT(r13)
+ addi r5,r4,THREAD /* Get THREAD */
+ ld r4,THREAD_FPEXC_MODE(r5)
+ ori r12,r12,MSR_FP
+ or r12,r12,r4
+ std r12,_MSR(r1)
+#endif
lfd fr0,THREAD_FPSCR-4(r5)
mtfsf 0xff,fr0
REST_32FPRS(0, r5)
#ifndef CONFIG_SMP
subi r4,r5,THREAD
- sub r4,r4,r6
- stw r4,last_task_used_math@l(r3)
+ tovirt(r4,r4)
+ STL r4,OFF(last_task_used_math)(r3)
#endif /* CONFIG_SMP */
/* restore registers and return */
/* we haven't used ctr or xer or lr */
b fast_exception_return
/*
- * FP unavailable trap from kernel - print a message, but let
- * the task use FP in the kernel until it returns to user mode.
- */
- .globl KernelFP
-KernelFP:
- lwz r3,_MSR(r1)
- ori r3,r3,MSR_FP
- stw r3,_MSR(r1) /* enable use of FP after return */
- lis r3,86f@h
- ori r3,r3,86f@l
- mr r4,r2 /* current */
- lwz r5,_NIP(r1)
- bl printk
- b ret_from_except
-86: .string "floating point used in kernel (task=%p, pc=%x)\n"
- .align 4,0
-
-/*
* giveup_fpu(tsk)
* Disable FP for the task given as the argument,
* and save the floating-point registers in its thread_struct.
* Enables the FPU for use in the kernel on return.
*/
- .globl giveup_fpu
-giveup_fpu:
+_GLOBAL(giveup_fpu)
mfmsr r5
ori r5,r5,MSR_FP
SYNC_601
@@ -111,23 +97,23 @@
MTMSRD(r5) /* enable use of fpu now */
SYNC_601
isync
- cmpwi 0,r3,0
+ CMPI 0,r3,0
beqlr- /* if no previous owner, done */
addi r3,r3,THREAD /* want THREAD of task */
- lwz r5,PT_REGS(r3)
- cmpwi 0,r5,0
+ LDL r5,PT_REGS(r3)
+ CMPI 0,r5,0
SAVE_32FPRS(0, r3)
mffs fr0
stfd fr0,THREAD_FPSCR-4(r3)
beq 1f
- lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
+ LDL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
li r3,MSR_FP|MSR_FE0|MSR_FE1
andc r4,r4,r3 /* disable FP for previous task */
- stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
+ STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
#ifndef CONFIG_SMP
li r5,0
- lis r4,last_task_used_math@ha
- stw r5,last_task_used_math@l(r4)
+ LOADBASE(r4,last_task_used_math)
+ STL r5,OFF(last_task_used_math)(r4)
#endif /* CONFIG_SMP */
blr
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index db0cd35..a36ee6e 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -80,7 +80,7 @@
_GLOBAL(__start)
/* NOP this out unconditionally */
BEGIN_FTR_SECTION
- b .__start_initialization_multiplatform
+ b .__start_initialization_multiplatform
END_FTR_SECTION(0, 1)
#endif /* CONFIG_PPC_MULTIPLATFORM */
@@ -857,62 +857,6 @@
bl .kernel_fp_unavailable_exception
BUG_OPCODE
-/*
- * load_up_fpu(unused, unused, tsk)
- * Disable FP for the task which had the FPU previously,
- * and save its floating-point registers in its thread_struct.
- * Enables the FPU for use in the kernel on return.
- * On SMP we know the fpu is free, since we give it up every
- * switch (ie, no lazy save of the FP registers).
- * On entry: r13 == 'current' && last_task_used_math != 'current'
- */
-_STATIC(load_up_fpu)
- mfmsr r5 /* grab the current MSR */
- ori r5,r5,MSR_FP
- mtmsrd r5 /* enable use of fpu now */
- isync
-/*
- * For SMP, we don't do lazy FPU switching because it just gets too
- * horrendously complex, especially when a task switches from one CPU
- * to another. Instead we call giveup_fpu in switch_to.
- *
- */
-#ifndef CONFIG_SMP
- ld r3,last_task_used_math@got(r2)
- ld r4,0(r3)
- cmpdi 0,r4,0
- beq 1f
- /* Save FP state to last_task_used_math's THREAD struct */
- addi r4,r4,THREAD
- SAVE_32FPRS(0, r4)
- mffs fr0
- stfd fr0,THREAD_FPSCR(r4)
- /* Disable FP for last_task_used_math */
- ld r5,PT_REGS(r4)
- ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- li r6,MSR_FP|MSR_FE0|MSR_FE1
- andc r4,r4,r6
- std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* CONFIG_SMP */
- /* enable use of FP after return */
- ld r4,PACACURRENT(r13)
- addi r5,r4,THREAD /* Get THREAD */
- ld r4,THREAD_FPEXC_MODE(r5)
- ori r12,r12,MSR_FP
- or r12,r12,r4
- std r12,_MSR(r1)
- lfd fr0,THREAD_FPSCR(r5)
- mtfsf 0xff,fr0
- REST_32FPRS(0, r5)
-#ifndef CONFIG_SMP
- /* Update last_task_used_math to 'current' */
- subi r4,r5,THREAD /* Back to 'current' */
- std r4,0(r3)
-#endif /* CONFIG_SMP */
- /* restore registers and return */
- b fast_exception_return
-
.align 7
.globl altivec_unavailable_common
altivec_unavailable_common:
