* for more details.
*
* Copyright (C) 1994 - 1999, 2000 by Ralf Baechle and others.
+ * Copyright (C) 2005, 2006 by Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2004 Thiemo Seufer
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/a.out.h>
#include <linux/init.h>
#include <linux/completion.h>
+#include <linux/kallsyms.h>
+#include <asm/abi.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
+#include <asm/dsp.h>
#include <asm/fpu.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/elf.h>
#include <asm/isadep.h>
#include <asm/inst.h>
-
-/*
- * We use this if we don't have any better idle routine..
- * (This to kill: kernel/platform.c.
- */
-void default_idle (void)
-{
-}
+#ifdef CONFIG_MIPS_MT_SMTC
+#include <asm/mipsmtregs.h>
+extern void smtc_idle_loop_hook(void);
+#endif /* CONFIG_MIPS_MT_SMTC */
/*
* The idle thread. There's no useful work to be done, so just try to conserve
{
/* endless idle loop with no priority at all */
while (1) {
- while (!need_resched())
+ while (!need_resched()) {
+#ifdef CONFIG_MIPS_MT_SMTC
+ smtc_idle_loop_hook();
+#endif /* CONFIG_MIPS_MT_SMTC */
if (cpu_wait)
(*cpu_wait)();
+ }
+ preempt_enable_no_resched();
schedule();
+ preempt_disable();
}
}
+/*
+ * Native o32 and N64 ABI without DSP ASE
+ */
+struct mips_abi mips_abi = {
+ .do_signal = do_signal,
+#ifdef CONFIG_TRAD_SIGNALS
+ .setup_frame = setup_frame,
+#endif
+ .setup_rt_frame = setup_rt_frame
+};
+
+#ifdef CONFIG_MIPS32_O32
+/*
+ * o32 compatibility on 64-bit kernels, without DSP ASE
+ */
+struct mips_abi mips_abi_32 = {
+ .do_signal = do_signal32,
+ .setup_frame = setup_frame_32,
+ .setup_rt_frame = setup_rt_frame_32
+};
+#endif /* CONFIG_MIPS32_O32 */
+
+#ifdef CONFIG_MIPS32_N32
+/*
+ * N32 on 64-bit kernels, without DSP ASE
+ */
+struct mips_abi mips_abi_n32 = {
+ .do_signal = do_signal,
+ .setup_rt_frame = setup_rt_frame_n32
+};
+#endif /* CONFIG_MIPS32_N32 */
+
asmlinkage void ret_from_fork(void);
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
/* New thread loses kernel privileges. */
status = regs->cp0_status & ~(ST0_CU0|ST0_CU1|KU_MASK);
-#ifdef CONFIG_MIPS64
+#ifdef CONFIG_64BIT
status &= ~ST0_FR;
status |= (current->thread.mflags & MF_32BIT_REGS) ? 0 : ST0_FR;
#endif
status |= KU_USER;
regs->cp0_status = status;
- current->used_math = 0;
+ clear_used_math();
lose_fpu();
+ if (cpu_has_dsp)
+ __init_dsp();
regs->cp0_epc = pc;
regs->regs[29] = sp;
current_thread_info()->addr_limit = USER_DS;
int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p, struct pt_regs *regs)
{
- struct thread_info *ti = p->thread_info;
+ struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs;
long childksp;
+ p->set_child_tid = p->clear_child_tid = NULL;
+
+ childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE - 32;
- childksp = (unsigned long)ti + THREAD_SIZE - 32;
+ preempt_disable();
- if (is_fpu_owner()) {
+ if (is_fpu_owner())
save_fp(p);
- }
+
+ if (cpu_has_dsp)
+ save_dsp(p);
+
+ preempt_enable();
/* set up new TSS. */
childregs = (struct pt_regs *) childksp - 1;
*childregs = *regs;
childregs->regs[7] = 0; /* Clear error flag */
-#ifdef CONFIG_BINFMT_IRIX
+#if defined(CONFIG_BINFMT_IRIX)
if (current->personality != PER_LINUX) {
/* Under IRIX things are a little different. */
- childregs->regs[2] = 0;
childregs->regs[3] = 1;
- regs->regs[2] = p->pid;
regs->regs[3] = 0;
- } else
-#endif
- {
- childregs->regs[2] = 0; /* Child gets zero as return value */
- regs->regs[2] = p->pid;
}
+#endif
+ childregs->regs[2] = 0; /* Child gets zero as return value */
+ regs->regs[2] = p->pid;
if (childregs->cp0_status & ST0_CU0) {
childregs->regs[28] = (unsigned long) ti;
p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
clear_tsk_thread_flag(p, TIF_USEDFPU);
- p->set_child_tid = p->clear_child_tid = NULL;
+
+#ifdef CONFIG_MIPS_MT_FPAFF
+ /*
+ * FPU affinity support is cleaner if we track the
+ * user-visible CPU affinity from the very beginning.
+ * The generic cpus_allowed mask will already have
+ * been copied from the parent before copy_thread
+ * is invoked.
+ */
+ p->thread.user_cpus_allowed = p->cpus_allowed;
+#endif /* CONFIG_MIPS_MT_FPAFF */
+
+ if (clone_flags & CLONE_SETTLS)
+ ti->tp_value = regs->regs[7];
return 0;
}
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
{
memcpy(r, ¤t->thread.fpu, sizeof(current->thread.fpu));
+
+ return 1;
+}
+
+void elf_dump_regs(elf_greg_t *gp, struct pt_regs *regs)
+{
+ int i;
+
+ for (i = 0; i < EF_R0; i++)
+ gp[i] = 0;
+ gp[EF_R0] = 0;
+ for (i = 1; i <= 31; i++)
+ gp[EF_R0 + i] = regs->regs[i];
+ gp[EF_R26] = 0;
+ gp[EF_R27] = 0;
+ gp[EF_LO] = regs->lo;
+ gp[EF_HI] = regs->hi;
+ gp[EF_CP0_EPC] = regs->cp0_epc;
+ gp[EF_CP0_BADVADDR] = regs->cp0_badvaddr;
+ gp[EF_CP0_STATUS] = regs->cp0_status;
+ gp[EF_CP0_CAUSE] = regs->cp0_cause;
+#ifdef EF_UNUSED0
+ gp[EF_UNUSED0] = 0;
+#endif
+}
+
+int dump_task_regs (struct task_struct *tsk, elf_gregset_t *regs)
+{
+ elf_dump_regs(*regs, task_pt_regs(tsk));
+ return 1;
+}
+
+int dump_task_fpu (struct task_struct *t, elf_fpregset_t *fpr)
+{
+ memcpy(fpr, &t->thread.fpu, sizeof(current->thread.fpu));
+
return 1;
}
/*
* Create a kernel thread
*/
+ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
+{
+ do_exit(fn(arg));
+}
+
long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
- long retval;
-
- __asm__ __volatile__(
- " move $6, $sp \n"
- " move $4, %5 \n"
- " li $2, %1 \n"
- " syscall \n"
- " beq $6, $sp, 1f \n"
-#ifdef CONFIG_MIPS32 /* On o32 the caller has to create the stackframe */
- " subu $sp, 32 \n"
-#endif
- " move $4, %3 \n"
- " jalr %4 \n"
- " move $4, $2 \n"
- " li $2, %2 \n"
- " syscall \n"
-#ifdef CONFIG_MIPS32 /* On o32 the caller has to deallocate the stackframe */
- " addiu $sp, 32 \n"
+ struct pt_regs regs;
+
+ memset(®s, 0, sizeof(regs));
+
+ regs.regs[4] = (unsigned long) arg;
+ regs.regs[5] = (unsigned long) fn;
+ regs.cp0_epc = (unsigned long) kernel_thread_helper;
+ regs.cp0_status = read_c0_status();
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+ regs.cp0_status &= ~(ST0_KUP | ST0_IEC);
+ regs.cp0_status |= ST0_IEP;
+#else
+ regs.cp0_status |= ST0_EXL;
#endif
- "1: move %0, $2"
- : "=r" (retval)
- : "i" (__NR_clone), "i" (__NR_exit), "r" (arg), "r" (fn),
- "r" (flags | CLONE_VM | CLONE_UNTRACED)
- /*
- * 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","$31");
-
- return retval;
+
+ /* Ok, create the new process.. */
+ return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
}
-struct mips_frame_info {
- int frame_offset;
+static struct mips_frame_info {
+ void *func;
+ unsigned long func_size;
+ int frame_size;
int pc_offset;
-};
-static 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)
+} *schedule_frame, mfinfo[64];
+static int mfinfo_num;
+
+static int __init get_frame_info(struct mips_frame_info *info)
{
int i;
+ void *func = info->func;
union mips_instruction *ip = (union mips_instruction *)func;
info->pc_offset = -1;
- info->frame_offset = -1;
+ info->frame_size = 0;
for (i = 0; i < 128; i++, ip++) {
/* if jal, jalr, jr, stop. */
if (ip->j_format.opcode == jal_op ||
ip->r_format.func == jr_op)))
break;
+ if (info->func_size && i >= info->func_size / 4)
+ break;
if (
-#ifdef CONFIG_MIPS32
+#ifdef CONFIG_32BIT
+ ip->i_format.opcode == addiu_op &&
+#endif
+#ifdef CONFIG_64BIT
+ ip->i_format.opcode == daddiu_op &&
+#endif
+ ip->i_format.rs == 29 &&
+ ip->i_format.rt == 29) {
+ /* addiu/daddiu sp,sp,-imm */
+ if (info->frame_size)
+ continue;
+ info->frame_size = - ip->i_format.simmediate;
+ }
+
+ if (
+#ifdef CONFIG_32BIT
ip->i_format.opcode == sw_op &&
#endif
-#ifdef CONFIG_MIPS64
+#ifdef CONFIG_64BIT
ip->i_format.opcode == sd_op &&
#endif
- ip->i_format.rs == 29)
- {
+ ip->i_format.rs == 29 &&
+ ip->i_format.rt == 31) {
/* sw / 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);
- }
- /* sw / 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)
+ continue;
+ info->pc_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);
+ if (info->pc_offset == -1 || info->frame_size == 0) {
+ if (func == schedule)
+ printk("Can't analyze prologue code at %p\n", func);
info->pc_offset = -1;
- info->frame_offset = -1;
- return -1;
+ info->frame_size = 0;
}
return 0;
static int __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);
+ int i;
+#ifdef CONFIG_KALLSYMS
+ char *modname;
+ char namebuf[KSYM_NAME_LEN + 1];
+ unsigned long start, size, ofs;
+ extern char __sched_text_start[], __sched_text_end[];
+ extern char __lock_text_start[], __lock_text_end[];
+
+ start = (unsigned long)__sched_text_start;
+ for (i = 0; i < ARRAY_SIZE(mfinfo); i++) {
+ if (start == (unsigned long)schedule)
+ schedule_frame = &mfinfo[i];
+ if (!kallsyms_lookup(start, &size, &ofs, &modname, namebuf))
+ break;
+ mfinfo[i].func = (void *)(start + ofs);
+ mfinfo[i].func_size = size;
+ start += size - ofs;
+ if (start >= (unsigned long)__lock_text_end)
+ break;
+ if (start == (unsigned long)__sched_text_end)
+ start = (unsigned long)__lock_text_start;
+ }
+#else
+ mfinfo[0].func = schedule;
+ schedule_frame = &mfinfo[0];
+#endif
+ for (i = 0; i < ARRAY_SIZE(mfinfo) && mfinfo[i].func; i++)
+ get_frame_info(&mfinfo[i]);
+ mfinfo_num = i;
return 0;
}
*/
unsigned long thread_saved_pc(struct task_struct *tsk)
{
- extern void ret_from_fork(void);
struct thread_struct *t = &tsk->thread;
/* New born processes are a special case */
if (t->reg31 == (unsigned long) ret_from_fork)
return t->reg31;
- if (schedule_frame.pc_offset < 0)
+ if (!schedule_frame || schedule_frame->pc_offset < 0)
return 0;
- return ((unsigned long *)t->reg29)[schedule_frame.pc_offset];
+ return ((unsigned long *)t->reg29)[schedule_frame->pc_offset];
}
/* get_wchan - a maintenance nightmare^W^Wpain in the ass ... */
unsigned long get_wchan(struct task_struct *p)
{
- unsigned long frame, pc;
+ unsigned long stack_page;
+ unsigned long pc;
+#ifdef CONFIG_KALLSYMS
+ unsigned long frame;
+#endif
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
- if (!mips_frame_info_initialized)
+ stack_page = (unsigned long)task_stack_page(p);
+ if (!stack_page || !mfinfo_num)
return 0;
+
pc = thread_saved_pc(p);
+#ifdef CONFIG_KALLSYMS
if (!in_sched_functions(pc))
- goto out;
-
- if (pc >= (unsigned long) sleep_on_timeout)
- goto schedule_timeout_caller;
- if (pc >= (unsigned long) sleep_on)
- goto schedule_caller;
- if (pc >= (unsigned long) interruptible_sleep_on_timeout)
- 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)[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:
- /*
- * The schedule_timeout frame
- */
- frame = ((unsigned long *)p->thread.reg30)[schedule_frame.frame_offset];
+ return pc;
- /*
- * frame now points to sleep_on_timeout's frame
- */
- pc = ((unsigned long *)frame)[schedule_timeout_frame.pc_offset];
+ frame = p->thread.reg29 + schedule_frame->frame_size;
+ do {
+ int i;
- if (in_sched_functions(pc)) {
- /* 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];
- }
+ if (frame < stack_page || frame > stack_page + THREAD_SIZE - 32)
+ return 0;
-out:
+ for (i = mfinfo_num - 1; i >= 0; i--) {
+ if (pc >= (unsigned long) mfinfo[i].func)
+ break;
+ }
+ if (i < 0)
+ break;
-#ifdef CONFIG_MIPS64
- if (current->thread.mflags & MF_32BIT_REGS) /* Kludge for 32-bit ps */
- pc &= 0xffffffffUL;
+ pc = ((unsigned long *)frame)[mfinfo[i].pc_offset];
+ if (!mfinfo[i].frame_size)
+ break;
+ frame += mfinfo[i].frame_size;
+ } while (in_sched_functions(pc));
#endif
return pc;
}
-EXPORT_SYMBOL(get_wchan);
git://git.onelab.eu / linux-2.6.git / blobdiff