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[PATCH] ARM: Remove global nwfpe register variable

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Recent changes to nwfpe broke the build with some gcc versions:

In file included from arch/arm/nwfpe/softfloat.c:33:
arch/arm/nwfpe/fpa11.h:32: global register variable follows a function definition
make[1]: *** [arch/arm/nwfpe/softfloat.o] Error 1

Since we now ensure that the kernel stack is empty when returning
to user space, we can now access the userspace registers with
reference to the kernel stack using current_thread_info(), rather
than remembering the stack pointer at the time nwfpe was called.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-07-17 10:54:50 +01:00 committed by Russell King
parent f60f700876
commit b66da4a485
3 changed files with 9 additions and 11 deletions
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4
arch/arm/nwfpe/fpa11.h
View File

@ -29,9 +29,7 @@
* stack+task struct. Use the same method as 'current' uses to
* reach them.
*/
register unsigned long *user_registers asm("sl");
#define GET_USERREG() (user_registers)
#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1)
#include <linux/config.h>
#include <linux/thread_info.h>

2
arch/arm/nwfpe/fpmodule.c
View File

@ -132,7 +132,7 @@ void float_raise(signed char flags)
printk(KERN_DEBUG
"NWFPE: %s[%d] takes exception %08x at %p from %08lx\n",
current->comm, current->pid, flags,
__builtin_return_address(0), GET_USERREG()[15]);
__builtin_return_address(0), GET_USERREG()->ARM_pc);
#endif
/* Keep SoftFloat exception flags up to date. */

14
arch/arm/nwfpe/fpmodule.inl
View File

@ -28,8 +28,8 @@ static inline unsigned long readRegister(const unsigned int nReg)
for this in this routine. LDF/STF instructions with Rn = PC
depend on the PC being correct, as they use PC+8 in their
address calculations. */
unsigned long *userRegisters = GET_USERREG();
unsigned int val = userRegisters[nReg];
struct pt_regs *regs = GET_USERREG();
unsigned int val = regs->uregs[nReg];
if (REG_PC == nReg)
val -= 4;
return val;
@ -38,8 +38,8 @@ static inline unsigned long readRegister(const unsigned int nReg)
static inline void
writeRegister(const unsigned int nReg, const unsigned long val)
{
unsigned long *userRegisters = GET_USERREG();
userRegisters[nReg] = val;
struct pt_regs *regs = GET_USERREG();
regs->uregs[nReg] = val;
}
static inline unsigned long readCPSR(void)
@ -63,12 +63,12 @@ static inline unsigned long readConditionCodes(void)
static inline void writeConditionCodes(const unsigned long val)
{
unsigned long *userRegisters = GET_USERREG();
struct pt_regs *regs = GET_USERREG();
unsigned long rval;
/*
* Operate directly on userRegisters since
* the CPSR may be the PC register itself.
*/
rval = userRegisters[REG_CPSR] & ~CC_MASK;
userRegisters[REG_CPSR] = rval | (val & CC_MASK);
rval = regs->ARM_cpsr & ~CC_MASK;
regs->ARM_cpsr = rval | (val & CC_MASK);
}