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csky: remove unused members in processor.h

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Cleanup struct cpuinfo_csky and struct thread_struct, remove all esp0
related code. We could get pt_regs from sp and backtrace could use fp
in switch_stack.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
This commit is contained in:
Guo Ren 2018-12-09 17:31:53 +08:00
parent 8f4f1639a1
commit 17a68777bc
7 changed files with 0 additions and 40 deletions
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12
arch/csky/include/asm/processor.h
View File

@ -17,14 +17,7 @@
#endif
struct cpuinfo_csky {
unsigned long udelay_val;
unsigned long asid_cache;
/*
* Capability and feature descriptor structure for CSKY CPU
*/
unsigned long options;
unsigned int processor_id[4];
unsigned int fpu_id;
} __aligned(SMP_CACHE_BYTES);
extern struct cpuinfo_csky cpu_data[];
@ -50,11 +43,6 @@ extern struct cpuinfo_csky cpu_data[];
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long sr; /* saved status register */
unsigned long esp0; /* points to SR of stack frame */
/* Other stuff associated with the thread. */
unsigned long address; /* Last user fault */
unsigned long error_code;
/* FPU regs */
struct user_fp __aligned(16) user_fp;

1
arch/csky/kernel/asm-offsets.c
View File

@ -20,7 +20,6 @@ int main(void)
/* offsets into the thread struct */
DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
DEFINE(THREAD_SR, offsetof(struct thread_struct, sr));
DEFINE(THREAD_ESP0, offsetof(struct thread_struct, esp0));
DEFINE(THREAD_FESR, offsetof(struct thread_struct, user_fp.fesr));
DEFINE(THREAD_FCR, offsetof(struct thread_struct, user_fp.fcr));
DEFINE(THREAD_FPREG, offsetof(struct thread_struct, user_fp.vr));

12
arch/csky/kernel/entry.S
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@ -122,16 +122,6 @@ ENTRY(csky_systemcall)
psrset ee, ie
/* Stack frame for syscall, origin call set_esp0 */
mov r12, sp
bmaski r11, 13
andn r12, r11
bgeni r11, 9
addi r11, 32
addu r12, r11
st sp, (r12, 0)
lrw r11, __NR_syscalls
cmphs syscallid, r11 /* Check nr of syscall */
bt ret_from_exception
@ -230,8 +220,6 @@ resume_userspace:
1: RESTORE_ALL
exit_work:
mov a0, sp /* Stack address is arg[0] */
jbsr set_esp0 /* Call C level */
btsti r8, TIF_NEED_RESCHED
bt work_resched
/* If thread_info->flag is empty, RESTORE_ALL */

4
arch/csky/kernel/ptrace.c
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@ -50,15 +50,11 @@ static void singlestep_enable(struct task_struct *tsk)
*/
void user_enable_single_step(struct task_struct *child)
{
if (child->thread.esp0 == 0)
return;
singlestep_enable(child);
}
void user_disable_single_step(struct task_struct *child)
{
if (child->thread.esp0 == 0)
return;
singlestep_disable(child);
}

2
arch/csky/kernel/signal.c
View File

@ -238,8 +238,6 @@ static void do_signal(struct pt_regs *regs, int syscall)
if (!user_mode(regs))
return;
current->thread.esp0 = (unsigned long)regs;
/*
* If we were from a system call, check for system call restarting...
*/

6
arch/csky/kernel/traps.c
View File

@ -106,7 +106,6 @@ void buserr(struct pt_regs *regs)
pr_err("User mode Bus Error\n");
show_regs(regs);
current->thread.esp0 = (unsigned long) regs;
force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc, current);
}
@ -162,8 +161,3 @@ asmlinkage void trap_c(struct pt_regs *regs)
}
send_sig(sig, current, 0);
}
asmlinkage void set_esp0(unsigned long ssp)
{
current->thread.esp0 = ssp;
}

3
arch/csky/mm/fault.c
View File

@ -172,8 +172,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
bad_area_nosemaphore:
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) {
tsk->thread.address = address;
tsk->thread.error_code = write;
force_sig_fault(SIGSEGV, si_code, (void __user *)address, current);
return;
}
@ -207,6 +205,5 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
if (!user_mode(regs))
goto no_context;
tsk->thread.address = address;
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
}