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powerpc: make process.c suitable for both 32-bit and 64-bit 

Signed-off-by: Paul Mackerras <paulus@samba.org>
hifive-unleashed-5.1
Paul Mackerras 2005-10-10 22:29:05 +10:00
parent daec962e27
commit 06d67d5474
3 changed files with 352 additions and 136 deletions
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36
arch/powerpc/kernel/init_task.c 100644
View File

@ -0,0 +1,36 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/init_task.h>
#include <linux/fs.h>
#include <linux/mqueue.h>
#include <asm/uaccess.h>
static struct fs_struct init_fs = INIT_FS;
static struct files_struct init_files = INIT_FILES;
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
struct mm_struct init_mm = INIT_MM(init_mm);
EXPORT_SYMBOL(init_mm);
/*
* Initial thread structure.
*
* We need to make sure that this is 16384-byte aligned due to the
* way process stacks are handled. This is done by having a special
* "init_task" linker map entry..
*/
union thread_union init_thread_union
__attribute__((__section__(".data.init_task"))) =
{ INIT_THREAD_INFO(init_task) };
/*
* Initial task structure.
*
* All other task structs will be allocated on slabs in fork.c
*/
struct task_struct init_task = INIT_TASK(init_task);
EXPORT_SYMBOL(init_task);

446
arch/powerpc/kernel/process.c
View File

@ -36,6 +36,8 @@
#include <linux/kallsyms.h>
#include <linux/mqueue.h>
#include <linux/hardirq.h>
#include <linux/utsname.h>
#include <linux/kprobes.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
@ -44,6 +46,11 @@
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/prom.h>
#ifdef CONFIG_PPC64
#include <asm/firmware.h>
#include <asm/plpar_wrappers.h>
#include <asm/time.h>
#endif
extern unsigned long _get_SP(void);
@ -53,26 +60,6 @@ struct task_struct *last_task_used_altivec = NULL;
struct task_struct *last_task_used_spe = NULL;
#endif
static struct fs_struct init_fs = INIT_FS;
static struct files_struct init_files = INIT_FILES;
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
struct mm_struct init_mm = INIT_MM(init_mm);
EXPORT_SYMBOL(init_mm);
/* this is 8kB-aligned so we can get to the thread_info struct
at the base of it from the stack pointer with 1 integer instruction. */
union thread_union init_thread_union
__attribute__((__section__(".data.init_task"))) =
{ INIT_THREAD_INFO(init_task) };
/* initial task structure */
struct task_struct init_task = INIT_TASK(init_task);
EXPORT_SYMBOL(init_task);
/* only used to get secondary processor up */
struct task_struct *current_set[NR_CPUS] = {&init_task, };
/*
* Make sure the floating-point register state in the
* the thread_struct is up to date for task tsk.
@ -237,7 +224,10 @@ int set_dabr(unsigned long dabr)
return ret;
}
#ifdef CONFIG_PPC64
DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
static DEFINE_PER_CPU(unsigned long, current_dabr);
#endif
struct task_struct *__switch_to(struct task_struct *prev,
struct task_struct *new)
@ -308,10 +298,27 @@ struct task_struct *__switch_to(struct task_struct *prev,
set_dabr(new->thread.dabr);
__get_cpu_var(current_dabr) = new->thread.dabr;
}
flush_tlb_pending();
#endif
new_thread = &new->thread;
old_thread = &current->thread;
#ifdef CONFIG_PPC64
/*
* Collect processor utilization data per process
*/
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);
long unsigned start_tb, current_tb;
start_tb = old_thread->start_tb;
cu->current_tb = current_tb = mfspr(SPRN_PURR);
old_thread->accum_tb += (current_tb - start_tb);
new_thread->start_tb = current_tb;
}
#endif
local_irq_save(flags);
last = _switch(old_thread, new_thread);
@ -320,37 +327,106 @@ struct task_struct *__switch_to(struct task_struct *prev,
return last;
}
static int instructions_to_print = 16;
#ifdef CONFIG_PPC64
#define BAD_PC(pc) ((REGION_ID(pc) != KERNEL_REGION_ID) && \
(REGION_ID(pc) != VMALLOC_REGION_ID))
#else
#define BAD_PC(pc) ((pc) < KERNELBASE)
#endif
static void show_instructions(struct pt_regs *regs)
{
int i;
unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 *
sizeof(int));
printk("Instruction dump:");
for (i = 0; i < instructions_to_print; i++) {
int instr;
if (!(i % 8))
printk("\n");
if (BAD_PC(pc) || __get_user(instr, (unsigned int *)pc)) {
printk("XXXXXXXX ");
} else {
if (regs->nip == pc)
printk("<%08x> ", instr);
else
printk("%08x ", instr);
}
pc += sizeof(int);
}
printk("\n");
}
static struct regbit {
unsigned long bit;
const char *name;
} msr_bits[] = {
{MSR_EE, "EE"},
{MSR_PR, "PR"},
{MSR_FP, "FP"},
{MSR_ME, "ME"},
{MSR_IR, "IR"},
{MSR_DR, "DR"},
{0, NULL}
};
static void printbits(unsigned long val, struct regbit *bits)
{
const char *sep = "";
printk("<");
for (; bits->bit; ++bits)
if (val & bits->bit) {
printk("%s%s", sep, bits->name);
sep = ",";
}
printk(">");
}
#ifdef CONFIG_PPC64
#define REG "%016lX"
#define REGS_PER_LINE 4
#define LAST_VOLATILE 13
#else
#define REG "%08lX"
#define REGS_PER_LINE 8
#define LAST_VOLATILE 12
#endif
void show_regs(struct pt_regs * regs)
{
int i, trap;
printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",
regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
print_tainted());
printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
regs->msr&MSR_IR ? 1 : 0,
regs->msr&MSR_DR ? 1 : 0);
printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
regs->nip, regs->link, regs->ctr);
printk("REGS: %p TRAP: %04lx %s (%s)\n",
regs, regs->trap, print_tainted(), system_utsname.release);
printk("MSR: "REG" ", regs->msr);
printbits(regs->msr, msr_bits);
printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer);
trap = TRAP(regs);
if (trap == 0x300 || trap == 0x600)
printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
printk("TASK = %p[%d] '%s' THREAD: %p\n",
printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr);
printk("TASK = %p[%d] '%s' THREAD: %p",
current, current->pid, current->comm, current->thread_info);
printk("Last syscall: %ld ", current->thread.last_syscall);
#ifdef CONFIG_SMP
printk(" CPU: %d", smp_processor_id());
#endif /* CONFIG_SMP */
for (i = 0; i < 32; i++) {
long r;
if ((i % 8) == 0)
if ((i % REGS_PER_LINE) == 0)
printk("\n" KERN_INFO "GPR%02d: ", i);
if (__get_user(r, &regs->gpr[i]))
break;
printk("%08lX ", r);
if (i == 12 && !FULL_REGS(regs))
printk(REG " ", regs->gpr[i]);
if (i == LAST_VOLATILE && !FULL_REGS(regs))
break;
}
printk("\n");
@ -359,16 +435,20 @@ void show_regs(struct pt_regs * regs)
* Lookup NIP late so we have the best change of getting the
* above info out without failing
*/
printk("NIP [%08lx] ", regs->nip);
printk("NIP ["REG"] ", regs->nip);
print_symbol("%s\n", regs->nip);
printk("LR [%08lx] ", regs->link);
printk("LR ["REG"] ", regs->link);
print_symbol("%s\n", regs->link);
#endif
show_stack(current, (unsigned long *) regs->gpr[1]);
if (!user_mode(regs))
show_instructions(regs);
}
void exit_thread(void)
{
kprobe_flush_task(current);
#ifndef CONFIG_SMP
if (last_task_used_math == current)
last_task_used_math = NULL;
@ -385,6 +465,14 @@ void exit_thread(void)
void flush_thread(void)
{
#ifdef CONFIG_PPC64
struct thread_info *t = current_thread_info();
if (t->flags & _TIF_ABI_PENDING)
t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
#endif
kprobe_flush_task(current);
#ifndef CONFIG_SMP
if (last_task_used_math == current)
last_task_used_math = NULL;
@ -425,15 +513,13 @@ void prepare_to_copy(struct task_struct *tsk)
/*
* Copy a thread..
*/
int
copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
unsigned long unused,
struct task_struct *p, struct pt_regs *regs)
int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
unsigned long unused, struct task_struct *p,
struct pt_regs *regs)
{
struct pt_regs *childregs, *kregs;
extern void ret_from_fork(void);
unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;
unsigned long childframe;
CHECK_FULL_REGS(regs);
/* Copy registers */
@ -443,17 +529,26 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
if ((childregs->msr & MSR_PR) == 0) {
/* for kernel thread, set `current' and stackptr in new task */
childregs->gpr[1] = sp + sizeof(struct pt_regs);
#ifdef CONFIG_PPC32
childregs->gpr[2] = (unsigned long) p;
#else
clear_ti_thread_flag(p->thread_info, TIF_32BIT);
#endif
p->thread.regs = NULL; /* no user register state */
} else {
childregs->gpr[1] = usp;
p->thread.regs = childregs;
if (clone_flags & CLONE_SETTLS)
childregs->gpr[2] = childregs->gpr[6];
if (clone_flags & CLONE_SETTLS) {
#ifdef CONFIG_PPC64
if (!test_thread_flag(TIF_32BIT))
childregs->gpr[13] = childregs->gpr[6];
else
#endif
childregs->gpr[2] = childregs->gpr[6];
}
}
childregs->gpr[3] = 0; /* Result from fork() */
sp -= STACK_FRAME_OVERHEAD;
childframe = sp;
/*
* The way this works is that at some point in the future
@ -467,9 +562,30 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
kregs = (struct pt_regs *) sp;
sp -= STACK_FRAME_OVERHEAD;
p->thread.ksp = sp;
kregs->nip = (unsigned long)ret_from_fork;
#ifdef CONFIG_PPC64
if (cpu_has_feature(CPU_FTR_SLB)) {
unsigned long sp_vsid = get_kernel_vsid(sp);
sp_vsid <<= SLB_VSID_SHIFT;
sp_vsid |= SLB_VSID_KERNEL;
if (cpu_has_feature(CPU_FTR_16M_PAGE))
sp_vsid |= SLB_VSID_L;
p->thread.ksp_vsid = sp_vsid;
}
/*
* The PPC64 ABI makes use of a TOC to contain function
* pointers. The function (ret_from_except) is actually a pointer
* to the TOC entry. The first entry is a pointer to the actual
* function.
*/
kregs->nip = *((unsigned long *)ret_from_fork);
#else
kregs->nip = (unsigned long)ret_from_fork;
p->thread.last_syscall = -1;
#endif
return 0;
}
@ -477,18 +593,61 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
/*
* Set up a thread for executing a new program
*/
void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
{
set_fs(USER_DS);
/*
* If we exec out of a kernel thread then thread.regs will not be
* set. Do it now.
*/
if (!current->thread.regs) {
unsigned long childregs = (unsigned long)current->thread_info +
THREAD_SIZE;
childregs -= sizeof(struct pt_regs);
current->thread.regs = (struct pt_regs *)childregs;
}
memset(regs->gpr, 0, sizeof(regs->gpr));
regs->ctr = 0;
regs->link = 0;
regs->xer = 0;
regs->ccr = 0;
regs->mq = 0;
regs->nip = nip;
regs->gpr[1] = sp;
#ifdef CONFIG_PPC32
regs->mq = 0;
regs->nip = start;
regs->msr = MSR_USER;
#else
if (test_thread_flag(TIF_32BIT)) {
unsigned long entry, toc, load_addr = regs->gpr[2];
/* start is a relocated pointer to the function descriptor for
* the elf _start routine. The first entry in the function
* descriptor is the entry address of _start and the second
* entry is the TOC value we need to use.
*/
__get_user(entry, (unsigned long __user *)start);
__get_user(toc, (unsigned long __user *)start+1);
/* Check whether the e_entry function descriptor entries
* need to be relocated before we can use them.
*/
if (load_addr != 0) {
entry += load_addr;
toc += load_addr;
}
regs->nip = entry;
regs->gpr[2] = toc;
regs->msr = MSR_USER64;
} else {
regs->nip = start;
regs->gpr[2] = 0;
regs->msr = MSR_USER32;
}
#endif
#ifndef CONFIG_SMP
if (last_task_used_math == current)
last_task_used_math = NULL;
@ -506,6 +665,7 @@ void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
#ifdef CONFIG_ALTIVEC
memset(current->thread.vr, 0, sizeof(current->thread.vr));
memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */
current->thread.vrsave = 0;
current->thread.used_vr = 0;
#endif /* CONFIG_ALTIVEC */
@ -532,22 +692,23 @@ int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
#ifdef CONFIG_SPE
tsk->thread.fpexc_mode = val &
(PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
return 0;
#else
return -EINVAL;
#endif
} else {
/* on a CONFIG_SPE this does not hurt us. The bits that
* __pack_fe01 use do not overlap with bits used for
* PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
* on CONFIG_SPE implementations are reserved so writing to
* them does not change anything */
if (val > PR_FP_EXC_PRECISE)
return -EINVAL;
tsk->thread.fpexc_mode = __pack_fe01(val);
if (regs != NULL && (regs->msr & MSR_FP) != 0)
regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
| tsk->thread.fpexc_mode;
}
/* on a CONFIG_SPE this does not hurt us. The bits that
* __pack_fe01 use do not overlap with bits used for
* PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
* on CONFIG_SPE implementations are reserved so writing to
* them does not change anything */
if (val > PR_FP_EXC_PRECISE)
return -EINVAL;
tsk->thread.fpexc_mode = __pack_fe01(val);
if (regs != NULL && (regs->msr & MSR_FP) != 0)
regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
| tsk->thread.fpexc_mode;
return 0;
}
@ -566,6 +727,8 @@ int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
return put_user(val, (unsigned int __user *) adr);
}
#define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
int sys_clone(unsigned long clone_flags, unsigned long usp,
int __user *parent_tidp, void __user *child_threadptr,
int __user *child_tidp, int p6,
@ -574,6 +737,12 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
CHECK_FULL_REGS(regs);
if (usp == 0)
usp = regs->gpr[1]; /* stack pointer for child */
#ifdef CONFIG_PPC64
if (test_thread_flag(TIF_32BIT)) {
parent_tidp = TRUNC_PTR(parent_tidp);
child_tidp = TRUNC_PTR(child_tidp);
}
#endif
return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
}
@ -599,7 +768,7 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
struct pt_regs *regs)
{
int error;
char * filename;
char *filename;
filename = getname((char __user *) a0);
error = PTR_ERR(filename);
@ -644,20 +813,53 @@ static int validate_sp(unsigned long sp, struct task_struct *p,
return 0;
}
void dump_stack(void)
{
show_stack(current, NULL);
}
#ifdef CONFIG_PPC64
#define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */
#define FRAME_LR_SAVE 2
#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
#define REGS_MARKER 0x7265677368657265ul
#define FRAME_MARKER 12
#else
#define MIN_STACK_FRAME 16
#define FRAME_LR_SAVE 1
#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
#define REGS_MARKER 0x72656773ul
#define FRAME_MARKER 2
#endif
EXPORT_SYMBOL(dump_stack);
unsigned long get_wchan(struct task_struct *p)
{
unsigned long ip, sp;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
sp = p->thread.ksp;
if (!validate_sp(sp, p, MIN_STACK_FRAME))
return 0;
do {
sp = *(unsigned long *)sp;
if (!validate_sp(sp, p, MIN_STACK_FRAME))
return 0;
if (count > 0) {
ip = ((unsigned long *)sp)[FRAME_LR_SAVE];
if (!in_sched_functions(ip))
return ip;
}
} while (count++ < 16);
return 0;
}
EXPORT_SYMBOL(get_wchan);
static int kstack_depth_to_print = 64;
void show_stack(struct task_struct *tsk, unsigned long *stack)
{
unsigned long sp, stack_top, prev_sp, ret;
unsigned long sp, ip, lr, newsp;
int count = 0;
unsigned long next_exc = 0;
struct pt_regs *regs;
extern char ret_from_except, ret_from_except_full, ret_from_syscall;
int firstframe = 1;
sp = (unsigned long) stack;
if (tsk == NULL)
@ -669,65 +871,45 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
sp = tsk->thread.ksp;
}
prev_sp = (unsigned long) (tsk->thread_info + 1);
stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;
while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {
if (count == 0) {
printk("Call trace:");
#ifdef CONFIG_KALLSYMS
printk("\n");
#endif
} else {
if (next_exc) {
ret = next_exc;
next_exc = 0;
} else
ret = *(unsigned long *)(sp + 4);
printk(" [%08lx] ", ret);
#ifdef CONFIG_KALLSYMS
print_symbol("%s", ret);
printk("\n");
#endif
if (ret == (unsigned long) &ret_from_except
|| ret == (unsigned long) &ret_from_except_full
|| ret == (unsigned long) &ret_from_syscall) {
/* sp + 16 points to an exception frame */
regs = (struct pt_regs *) (sp + 16);
if (sp + 16 + sizeof(*regs) <= stack_top)
next_exc = regs->nip;
}
}
++count;
sp = *(unsigned long *)sp;
}
#ifndef CONFIG_KALLSYMS
if (count > 0)
printk("\n");
#endif
}
unsigned long get_wchan(struct task_struct *p)
{
unsigned long ip, sp;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
sp = p->thread.ksp;
if (!validate_sp(sp, p, 16))
return 0;
lr = 0;
printk("Call Trace:\n");
do {
sp = *(unsigned long *)sp;
if (!validate_sp(sp, p, 16))
return 0;
if (count > 0) {
ip = *(unsigned long *)(sp + 4);
if (!in_sched_functions(ip))
return ip;
if (!validate_sp(sp, tsk, MIN_STACK_FRAME))
return;
stack = (unsigned long *) sp;
newsp = stack[0];
ip = stack[FRAME_LR_SAVE];
if (!firstframe || ip != lr) {
printk("["REG"] ["REG"] ", sp, ip);
print_symbol("%s", ip);
if (firstframe)
printk(" (unreliable)");
printk("\n");
}
} while (count++ < 16);
return 0;
firstframe = 0;
/*
* See if this is an exception frame.
* We look for the "regshere" marker in the current frame.
*/
if (validate_sp(sp, tsk, INT_FRAME_SIZE)
&& stack[FRAME_MARKER] == REGS_MARKER) {
struct pt_regs *regs = (struct pt_regs *)
(sp + STACK_FRAME_OVERHEAD);
printk("--- Exception: %lx", regs->trap);
print_symbol(" at %s\n", regs->nip);
lr = regs->link;
print_symbol(" LR = %s\n", lr);
firstframe = 1;
}
sp = newsp;
} while (count++ < kstack_depth_to_print);
}
EXPORT_SYMBOL(get_wchan);
void dump_stack(void)
{
show_stack(current, NULL);
}
EXPORT_SYMBOL(dump_stack);

6
include/asm-powerpc/elf.h
View File

@ -214,10 +214,8 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
but it's not easy, and we've already done it here. */
# define ELF_HWCAP (cur_cpu_spec->cpu_user_features)
#ifdef __powerpc64__
# define ELF_PLAT_INIT(_r, load_addr) do { \
memset(_r->gpr, 0, sizeof(_r->gpr)); \
_r->ctr = _r->link = _r->xer = _r->ccr = 0; \
_r->gpr[2] = load_addr; \
# define ELF_PLAT_INIT(_r, load_addr) do { \
_r->gpr[2] = load_addr; \
} while (0)
#endif /* __powerpc64__ */