[PATCH] mips: task_pt_regs()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 0476a4d..aca56f4 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -229,9 +229,7 @@ void elf_dump_regs(elf_greg_t *gp, struct pt_regs *regs)
 
 int dump_task_regs (struct task_struct *tsk, elf_gregset_t *regs)
 {
-       struct thread_info *ti = tsk->thread_info;
-       long ksp = (unsigned long)ti + THREAD_SIZE - 32;
-       elf_dump_regs(&(*regs)[0], (struct pt_regs *) ksp - 1);
+       elf_dump_regs(*regs, task_pt_regs(tsk));
        return 1;
 }
 

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 8d25493..6c358b3 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -64,8 +64,7 @@ int ptrace_getregs (struct task_struct *child, __s64 __user *data)
        if (!access_ok(VERIFY_WRITE, data, 38 * 8))
                return -EIO;
 
-       regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-              THREAD_SIZE - 32 - sizeof(struct pt_regs));
+       regs = task_pt_regs(child);
 
        for (i = 0; i < 32; i++)
                __put_user (regs->regs[i], data + i);
@@ -92,8 +91,7 @@ int ptrace_setregs (struct task_struct *child, __s64 __user *data)
        if (!access_ok(VERIFY_READ, data, 38 * 8))
                return -EIO;
 
-       regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-              THREAD_SIZE - 32 - sizeof(struct pt_regs));
+       regs = task_pt_regs(child);
 
        for (i = 0; i < 32; i++)
                __get_user (regs->regs[i], data + i);
@@ -198,8 +196,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                struct pt_regs *regs;
                unsigned long tmp = 0;
 
-               regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                      THREAD_SIZE - 32 - sizeof(struct pt_regs));
+               regs = task_pt_regs(child);
                ret = 0;  /* Default return value. */
 
                switch (addr) {
@@ -314,8 +311,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
        case PTRACE_POKEUSR: {
                struct pt_regs *regs;
                ret = 0;
-               regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                      THREAD_SIZE - 32 - sizeof(struct pt_regs));
+               regs = task_pt_regs(child);
 
                switch (addr) {
                case 0 ... 31:

diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index 1f998bf..456ec43 100644 (file)
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -126,8 +126,7 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
                struct pt_regs *regs;
                unsigned int tmp;
 
-               regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                      THREAD_SIZE - 32 - sizeof(struct pt_regs));
+               regs = task_pt_regs(child);
                ret = 0;  /* Default return value. */
 
                switch (addr) {
@@ -259,8 +258,7 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
        case PTRACE_POKEUSR: {
                struct pt_regs *regs;
                ret = 0;
-               regs = (struct pt_regs *) ((unsigned long) child->thread_info +
-                      THREAD_SIZE - 32 - sizeof(struct pt_regs));
+               regs = task_pt_regs(child);
 
                switch (addr) {
                case 0 ... 31:

diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h
index de53055..ab3123e 100644 (file)
--- a/include/asm-mips/processor.h
+++ b/include/asm-mips/processor.h
@@ -200,11 +200,11 @@ extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long
 
 unsigned long get_wchan(struct task_struct *p);
 
-#define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs))
 #define __KSTK_TOS(tsk) ((unsigned long)(tsk->thread_info) + THREAD_SIZE - 32)
-#define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc)))
-#define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29])))
-#define KSTK_STATUS(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_status)))
+#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
+#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
+#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
+#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
 
 #define cpu_relax()    barrier()
 

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 5f761ad..e8e5d41 100644 (file)
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -159,7 +159,7 @@ struct task_struct;
 do {                                                                   \
        if (cpu_has_dsp)                                                \
                __save_dsp(prev);                                       \
-       (last) = resume(prev, next, next->thread_info);                 \
+       (last) = resume(prev, next, task_thread_info(next));            \
        if (cpu_has_dsp)                                                \
                __restore_dsp(current);                                 \
 } while(0)