patch-2.4.22 linux-2.4.22/arch/mips64/kernel/process.c
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- Lines: 296
- Date:
2003-08-25 04:44:40.000000000 -0700
- Orig file:
linux-2.4.21/arch/mips64/kernel/process.c
- Orig date:
2003-06-13 07:51:31.000000000 -0700
diff -urN linux-2.4.21/arch/mips64/kernel/process.c linux-2.4.22/arch/mips64/kernel/process.c
@@ -19,6 +19,8 @@
#include <linux/sys.h>
#include <linux/user.h>
#include <linux/a.out.h>
+#include <linux/init.h>
+#include <linux/completion.h>
#include <asm/bootinfo.h>
#include <asm/pgtable.h>
@@ -30,6 +32,8 @@
#include <asm/io.h>
#include <asm/elf.h>
#include <asm/cpu.h>
+#include <asm/fpu.h>
+#include <asm/inst.h>
ATTRIB_NORET void cpu_idle(void)
{
@@ -46,32 +50,30 @@
}
}
-struct task_struct *last_task_used_math = NULL;
-
asmlinkage void ret_from_fork(void);
+void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
+{
+ unsigned long status;
+
+ /* New thread loses kernel privileges. */
+ status = regs->cp0_status & ~(ST0_CU0|ST0_FR|ST0_KSU);
+ status |= KSU_USER;
+ status |= (current->thread.mflags & MF_32BIT_REGS) ? 0 : ST0_FR;
+ regs->cp0_status = status;
+ current->used_math = 0;
+ lose_fpu();
+ regs->cp0_epc = pc;
+ regs->regs[29] = sp;
+ current->thread.current_ds = USER_DS;
+}
+
void exit_thread(void)
{
- /* Forget lazy fpu state */
- if (IS_FPU_OWNER()) {
- if (mips_cpu.options & MIPS_CPU_FPU) {
- __enable_fpu();
- __asm__ __volatile__("cfc1\t$0,$31");
- }
- CLEAR_FPU_OWNER();
- }
}
void flush_thread(void)
{
- /* Forget lazy fpu state */
- if (IS_FPU_OWNER()) {
- if (mips_cpu.options & MIPS_CPU_FPU) {
- __enable_fpu();
- __asm__ __volatile__("cfc1\t$0,$31");
- }
- CLEAR_FPU_OWNER();
- }
}
int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
@@ -83,10 +85,10 @@
childksp = (unsigned long)p + KERNEL_STACK_SIZE - 32;
- if (IS_FPU_OWNER()) {
- if (mips_cpu.options & MIPS_CPU_FPU)
- save_fp(p);
+ if (is_fpu_owner()) {
+ save_fp(p);
}
+
/* set up new TSS. */
childregs = (struct pt_regs *) childksp - 1;
*childregs = *regs;
@@ -106,12 +108,12 @@
p->thread.reg31 = (unsigned long) ret_from_fork;
/*
- * New tasks loose permission to use the fpu. This accelerates context
- * switching for most programs since they don't use the fpu.
+ * New tasks lose permission to use the fpu. This accelerates context
+ * switching for most programs since they don't use the fpu. Most
+ * MIPS IV CPUs use ST0_CU3 as ST0_XX flag so we leave it unchanged.
*/
- p->thread.cp0_status = read_32bit_cp0_register(CP0_STATUS) &
- ~(ST0_CU3|ST0_CU2|ST0_CU1|ST0_KSU);
- childregs->cp0_status &= ~(ST0_CU3|ST0_CU2|ST0_CU1);
+ p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1|ST0_KSU);
+ childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
return 0;
}
@@ -119,33 +121,8 @@
/* Fill in the fpu structure for a core dump.. */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
{
- /* We actually store the FPU info in the task->thread
- * area.
- */
- if (regs->cp0_status & ST0_CU1) {
- memcpy(r, ¤t->thread.fpu, sizeof(current->thread.fpu));
- return 1;
- }
-
- return 0; /* Task didn't use the fpu at all. */
-}
-
-/* Fill in the user structure for a core dump.. */
-void dump_thread(struct pt_regs *regs, struct user *dump)
-{
- dump->magic = CMAGIC;
- dump->start_code = current->mm->start_code;
- dump->start_data = current->mm->start_data;
- dump->start_stack = regs->regs[29] & ~(PAGE_SIZE - 1);
- dump->u_tsize = (current->mm->end_code - dump->start_code)
- >> PAGE_SHIFT;
- dump->u_dsize = (current->mm->brk + (PAGE_SIZE - 1) - dump->start_data)
- >> PAGE_SHIFT;
- dump->u_ssize = (current->mm->start_stack - dump->start_stack +
- PAGE_SIZE - 1) >> PAGE_SHIFT;
- memcpy(&dump->regs[0], regs, sizeof(struct pt_regs));
- memcpy(&dump->regs[EF_SIZE/4], ¤t->thread.fpu,
- sizeof(current->thread.fpu));
+ memcpy(r, ¤t->thread.fpu, sizeof(current->thread.fpu));
+ return 1;
}
/*
@@ -156,25 +133,26 @@
int retval;
__asm__ __volatile__(
- "move\t$6, $sp\n\t"
- "move\t$4, %5\n\t"
- "li\t$2, %1\n\t"
- "syscall\n\t"
- "beq\t$6, $sp, 1f\n\t"
- "move\t$4, %3\n\t"
- "jalr\t%4\n\t"
- "move\t$4, $2\n\t"
- "li\t$2, %2\n\t"
- "syscall\n"
- "1:\tmove\t%0, $2"
- :"=r" (retval)
- :"i" (__NR_clone), "i" (__NR_exit), "r" (arg), "r" (fn),
- "r" (flags | CLONE_VM)
-
- /* The called subroutine might have destroyed any of the
- * at, result, argument or temporary registers ... */
+ " move $6, $sp \n"
+ " move $4, %5 \n"
+ " li $2, %1 \n"
+ " syscall \n"
+ " beq $6, $sp, 1f \n"
+ " move $4, %3 \n"
+ " jalr %4 \n"
+ " move $4, $2 \n"
+ " li $2, %2 \n"
+ " syscall \n"
+ "1: move %0, $2 \n"
+ : "=r" (retval)
+ : "i" (__NR_clone), "i" (__NR_exit), "r" (arg), "r" (fn),
+ "r" (flags | CLONE_VM)
+ /*
+ * The called subroutine might have destroyed any of the
+ * at, result, argument or temporary registers ...
+ */
: "$2", "$3", "$4", "$5", "$6", "$7", "$8",
- "$9","$10","$11","$12","$13","$14","$15","$24","$25");
+ "$9","$10","$11","$12","$13","$14","$15","$24","$25","$31");
return retval;
}
@@ -187,6 +165,62 @@
#define first_sched ((unsigned long) scheduling_functions_start_here)
#define last_sched ((unsigned long) scheduling_functions_end_here)
+struct mips_frame_info schedule_frame;
+static struct mips_frame_info schedule_timeout_frame;
+static struct mips_frame_info sleep_on_frame;
+static struct mips_frame_info sleep_on_timeout_frame;
+static struct mips_frame_info wait_for_completion_frame;
+static int mips_frame_info_initialized;
+static int __init get_frame_info(struct mips_frame_info *info, void *func)
+{
+ int i;
+ union mips_instruction *ip = (union mips_instruction *)func;
+ info->pc_offset = -1;
+ info->frame_offset = -1;
+ for (i = 0; i < 128; i++, ip++) {
+ /* if jal, jalr, jr, stop. */
+ if (ip->j_format.opcode == jal_op ||
+ (ip->r_format.opcode == spec_op &&
+ (ip->r_format.func == jalr_op ||
+ ip->r_format.func == jr_op)))
+ break;
+ if (ip->i_format.opcode == sd_op &&
+ ip->i_format.rs == 29) {
+ /* sd $ra, offset($sp) */
+ if (ip->i_format.rt == 31) {
+ if (info->pc_offset != -1)
+ break;
+ info->pc_offset =
+ ip->i_format.simmediate / sizeof(long);
+ }
+ /* sd $s8, offset($sp) */
+ if (ip->i_format.rt == 30) {
+ if (info->frame_offset != -1)
+ break;
+ info->frame_offset =
+ ip->i_format.simmediate / sizeof(long);
+ }
+ }
+ }
+ if (info->pc_offset == -1 || info->frame_offset == -1) {
+ printk("Can't analyze prologue code at %p\n", func);
+ info->pc_offset = -1;
+ info->frame_offset = -1;
+ return -1;
+ }
+
+ return 0;
+}
+void __init frame_info_init(void)
+{
+ mips_frame_info_initialized =
+ !get_frame_info(&schedule_frame, schedule) &&
+ !get_frame_info(&schedule_timeout_frame, schedule_timeout) &&
+ !get_frame_info(&sleep_on_frame, sleep_on) &&
+ !get_frame_info(&sleep_on_timeout_frame, sleep_on_timeout) &&
+ !get_frame_info(&wait_for_completion_frame, wait_for_completion);
+}
+
/* get_wchan - a maintenance nightmare ... */
unsigned long get_wchan(struct task_struct *p)
{
@@ -195,6 +229,8 @@
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
+ if (!mips_frame_info_initialized)
+ return 0;
pc = thread_saved_pc(&p->thread);
if (pc < first_sched || pc >= last_sched)
goto out;
@@ -207,30 +243,33 @@
goto schedule_timeout_caller;
if (pc >= (unsigned long)interruptible_sleep_on)
goto schedule_caller;
+ if (pc >= (unsigned long)wait_for_completion)
+ goto schedule_caller;
goto schedule_timeout_caller;
schedule_caller:
- frame = ((unsigned long *)p->thread.reg30)[10];
- pc = ((unsigned long *)frame)[7];
+ frame = ((unsigned long *)p->thread.reg30)[schedule_frame.frame_offset];
+ if (pc >= (unsigned long) sleep_on)
+ pc = ((unsigned long *)frame)[sleep_on_frame.pc_offset];
+ else
+ pc = ((unsigned long *)frame)[wait_for_completion_frame.pc_offset];
goto out;
schedule_timeout_caller:
/* Must be schedule_timeout ... */
- pc = ((unsigned long *)p->thread.reg30)[11];
- frame = ((unsigned long *)p->thread.reg30)[10];
+ frame = ((unsigned long *)p->thread.reg30)[schedule_frame.frame_offset];
/* The schedule_timeout frame ... */
- pc = ((unsigned long *)frame)[9];
- frame = ((unsigned long *)frame)[8];
+ pc = ((unsigned long *)frame)[schedule_timeout_frame.pc_offset];
if (pc >= first_sched && pc < last_sched) {
- /* schedule_timeout called by interruptible_sleep_on_timeout */
- pc = ((unsigned long *)frame)[7];
- frame = ((unsigned long *)frame)[6];
+ /* schedule_timeout called by [interruptible_]sleep_on_timeout */
+ frame = ((unsigned long *)frame)[schedule_timeout_frame.frame_offset];
+ pc = ((unsigned long *)frame)[sleep_on_timeout_frame.pc_offset];
}
out:
- if (current->thread.mflags & MF_32BIT) /* Kludge for 32-bit ps */
+ if (current->thread.mflags & MF_32BIT_ADDR) /* Kludge for 32-bit ps */
pc &= 0xffffffff;
return pc;
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