process.c
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上传日期:2013-02-24
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- /* $Id: process.c,v 1.125.2.1 2001/12/18 19:40:17 davem Exp $
- * arch/sparc64/kernel/process.c
- *
- * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
- /*
- * This file handles the architecture-dependent parts of process handling..
- */
- #define __KERNEL_SYSCALLS__
- #include <stdarg.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/stddef.h>
- #include <linux/unistd.h>
- #include <linux/ptrace.h>
- #include <linux/slab.h>
- #include <linux/user.h>
- #include <linux/a.out.h>
- #include <linux/config.h>
- #include <linux/reboot.h>
- #include <linux/delay.h>
- #include <asm/oplib.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/page.h>
- #include <asm/pgalloc.h>
- #include <asm/pgtable.h>
- #include <asm/processor.h>
- #include <asm/pstate.h>
- #include <asm/elf.h>
- #include <asm/fpumacro.h>
- /* #define VERBOSE_SHOWREGS */
- #ifndef CONFIG_SMP
- /*
- * the idle loop on a Sparc... ;)
- */
- int cpu_idle(void)
- {
- if (current->pid != 0)
- return -EPERM;
- /* endless idle loop with no priority at all */
- current->nice = 20;
- current->counter = -100;
- init_idle();
- for (;;) {
- /* If current->need_resched is zero we should really
- * setup for a system wakup event and execute a shutdown
- * instruction.
- *
- * But this requires writing back the contents of the
- * L2 cache etc. so implement this later. -DaveM
- */
- while (!current->need_resched)
- barrier();
- schedule();
- check_pgt_cache();
- }
- return 0;
- }
- #else
- /*
- * the idle loop on a UltraMultiPenguin...
- */
- #define idle_me_harder() (cpu_data[current->processor].idle_volume += 1)
- #define unidle_me() (cpu_data[current->processor].idle_volume = 0)
- int cpu_idle(void)
- {
- current->nice = 20;
- current->counter = -100;
- init_idle();
- while(1) {
- if (current->need_resched != 0) {
- unidle_me();
- schedule();
- check_pgt_cache();
- }
- idle_me_harder();
- /* The store ordering is so that IRQ handlers on
- * other cpus see our increasing idleness for the buddy
- * redistribution algorithm. -DaveM
- */
- membar("#StoreStore | #StoreLoad");
- }
- }
- #endif
- extern char reboot_command [];
- #ifdef CONFIG_SUN_CONSOLE
- extern void (*prom_palette)(int);
- extern int serial_console;
- #endif
- extern void (*prom_keyboard)(void);
- void machine_halt(void)
- {
- sti();
- mdelay(8);
- cli();
- #ifdef CONFIG_SUN_CONSOLE
- if (!serial_console && prom_palette)
- prom_palette (1);
- #endif
- if (prom_keyboard)
- prom_keyboard();
- prom_halt();
- panic("Halt failed!");
- }
- void machine_restart(char * cmd)
- {
- char *p;
-
- sti();
- mdelay(8);
- cli();
- p = strchr (reboot_command, 'n');
- if (p) *p = 0;
- #ifdef CONFIG_SUN_CONSOLE
- if (!serial_console && prom_palette)
- prom_palette (1);
- #endif
- if (prom_keyboard)
- prom_keyboard();
- if (cmd)
- prom_reboot(cmd);
- if (*reboot_command)
- prom_reboot(reboot_command);
- prom_reboot("");
- panic("Reboot failed!");
- }
- static void show_regwindow32(struct pt_regs *regs)
- {
- struct reg_window32 *rw;
- struct reg_window32 r_w;
- mm_segment_t old_fs;
-
- __asm__ __volatile__ ("flushw");
- rw = (struct reg_window32 *)((long)(unsigned)regs->u_regs[14]);
- old_fs = get_fs();
- set_fs (USER_DS);
- if (copy_from_user (&r_w, rw, sizeof(r_w))) {
- set_fs (old_fs);
- return;
- }
- rw = &r_w;
- set_fs (old_fs);
- printk("l0: %08x l1: %08x l2: %08x l3: %08x "
- "l4: %08x l5: %08x l6: %08x l7: %08xn",
- rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
- rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
- printk("i0: %08x i1: %08x i2: %08x i3: %08x "
- "i4: %08x i5: %08x i6: %08x i7: %08xn",
- rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
- rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
- }
- static void show_regwindow(struct pt_regs *regs)
- {
- struct reg_window *rw;
- struct reg_window r_w;
- mm_segment_t old_fs;
- if ((regs->tstate & TSTATE_PRIV) || !(current->thread.flags & SPARC_FLAG_32BIT)) {
- __asm__ __volatile__ ("flushw");
- rw = (struct reg_window *)(regs->u_regs[14] + STACK_BIAS);
- if (!(regs->tstate & TSTATE_PRIV)) {
- old_fs = get_fs();
- set_fs (USER_DS);
- if (copy_from_user (&r_w, rw, sizeof(r_w))) {
- set_fs (old_fs);
- return;
- }
- rw = &r_w;
- set_fs (old_fs);
- }
- } else {
- show_regwindow32(regs);
- return;
- }
- printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lxn",
- rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3]);
- printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lxn",
- rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
- printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lxn",
- rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3]);
- printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lxn",
- rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
- }
- void show_stackframe(struct sparc_stackf *sf)
- {
- unsigned long size;
- unsigned long *stk;
- int i;
- printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lxn"
- "l4: %016lx l5: %016lx l6: %016lx l7: %016lxn",
- sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
- sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
- printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lxn"
- "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lxn",
- sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
- sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
- printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lxn"
- "x3: %016lx x4: %016lx x5: %016lx xx: %016lxn",
- (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
- sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
- sf->xxargs[0]);
- size = ((unsigned long)sf->fp) - ((unsigned long)sf);
- size -= STACKFRAME_SZ;
- stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
- i = 0;
- do {
- printk("s%d: %016lxn", i++, *stk++);
- } while ((size -= sizeof(unsigned long)));
- }
- void show_stackframe32(struct sparc_stackf32 *sf)
- {
- unsigned long size;
- unsigned *stk;
- int i;
- printk("l0: %08x l1: %08x l2: %08x l3: %08xn",
- sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
- printk("l4: %08x l5: %08x l6: %08x l7: %08xn",
- sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
- printk("i0: %08x i1: %08x i2: %08x i3: %08xn",
- sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
- printk("i4: %08x i5: %08x fp: %08x ret_pc: %08xn",
- sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
- printk("sp: %08x x0: %08x x1: %08x x2: %08xn"
- "x3: %08x x4: %08x x5: %08x xx: %08xn",
- sf->structptr, sf->xargs[0], sf->xargs[1],
- sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
- sf->xxargs[0]);
- size = ((unsigned long)sf->fp) - ((unsigned long)sf);
- size -= STACKFRAME32_SZ;
- stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
- i = 0;
- do {
- printk("s%d: %08xn", i++, *stk++);
- } while ((size -= sizeof(unsigned)));
- }
- #ifdef CONFIG_SMP
- static spinlock_t regdump_lock = SPIN_LOCK_UNLOCKED;
- #endif
- void __show_regs(struct pt_regs * regs)
- {
- #ifdef CONFIG_SMP
- unsigned long flags;
- /* Protect against xcall ipis which might lead to livelock on the lock */
- __asm__ __volatile__("rdpr %%pstate, %0nt"
- "wrpr %0, %1, %%pstate"
- : "=r" (flags)
- : "i" (PSTATE_IE));
- spin_lock(®dump_lock);
- printk("CPU[%d]: local_irq_count[%u] irqs_running[%d]n",
- smp_processor_id(),
- local_irq_count(smp_processor_id()),
- irqs_running());
- #endif
- printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %sn", regs->tstate,
- regs->tpc, regs->tnpc, regs->y, print_tainted());
- printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lxn",
- regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
- regs->u_regs[3]);
- printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lxn",
- regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
- regs->u_regs[7]);
- printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lxn",
- regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
- regs->u_regs[11]);
- printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lxn",
- regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
- regs->u_regs[15]);
- show_regwindow(regs);
- #ifdef CONFIG_SMP
- spin_unlock(®dump_lock);
- __asm__ __volatile__("wrpr %0, 0, %%pstate"
- : : "r" (flags));
- #endif
- }
- #ifdef VERBOSE_SHOWREGS
- static void idump_from_user (unsigned int *pc)
- {
- int i;
- int code;
-
- if((((unsigned long) pc) & 3))
- return;
-
- pc -= 3;
- for(i = -3; i < 6; i++) {
- get_user(code, pc);
- printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
- pc++;
- }
- printk("n");
- }
- #endif
- void show_regs(struct pt_regs *regs)
- {
- #ifdef VERBOSE_SHOWREGS
- extern long etrap, etraptl1;
- #endif
- __show_regs(regs);
- #ifdef CONFIG_SMP
- {
- extern void smp_report_regs(void);
- smp_report_regs();
- }
- #endif
- #ifdef VERBOSE_SHOWREGS
- if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
- regs->u_regs[14] >= (long)current - PAGE_SIZE &&
- regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
- printk ("*********parent**********n");
- __show_regs((struct pt_regs *)(regs->u_regs[14] + STACK_BIAS + REGWIN_SZ));
- idump_from_user(((struct pt_regs *)(regs->u_regs[14] + STACK_BIAS + REGWIN_SZ))->tpc);
- printk ("*********endpar**********n");
- }
- #endif
- }
- void show_regs32(struct pt_regs32 *regs)
- {
- printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %sn", regs->psr,
- regs->pc, regs->npc, regs->y, print_tainted());
- printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
- regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
- regs->u_regs[3]);
- printk("g4: %08x g5: %08x g6: %08x g7: %08xn",
- regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
- regs->u_regs[7]);
- printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
- regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
- regs->u_regs[11]);
- printk("o4: %08x o5: %08x sp: %08x ret_pc: %08xn",
- regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
- regs->u_regs[15]);
- }
- void show_thread(struct thread_struct *thread)
- {
- int i;
- #if 0
- printk("kregs: 0x%016lxn", (unsigned long)thread->kregs);
- show_regs(thread->kregs);
- #endif
- printk("ksp: 0x%016lxn", thread->ksp);
- if (thread->w_saved) {
- for (i = 0; i < NSWINS; i++) {
- if (!thread->rwbuf_stkptrs[i])
- continue;
- printk("reg_window[%d]:n", i);
- printk("stack ptr: 0x%016lxn", thread->rwbuf_stkptrs[i]);
- }
- printk("w_saved: 0x%04xn", thread->w_saved);
- }
- printk("flags: 0x%08xn", thread->flags);
- printk("current_ds: 0x%xn", thread->current_ds.seg);
- }
- /* Free current thread data structures etc.. */
- void exit_thread(void)
- {
- struct thread_struct *t = ¤t->thread;
- if (t->utraps) {
- if (t->utraps[0] < 2)
- kfree (t->utraps);
- else
- t->utraps[0]--;
- }
- /* Turn off performance counters if on. */
- if (t->flags & SPARC_FLAG_PERFCTR) {
- t->user_cntd0 = t->user_cntd1 = NULL;
- t->pcr_reg = 0;
- t->flags &= ~(SPARC_FLAG_PERFCTR);
- write_pcr(0);
- }
- }
- void flush_thread(void)
- {
- struct thread_struct *t = ¤t->thread;
- if (current->mm) {
- if (t->flags & SPARC_FLAG_32BIT) {
- struct mm_struct *mm = current->mm;
- pgd_t *pgd0 = &mm->pgd[0];
- unsigned long pgd_cache;
- if (pgd_none(*pgd0)) {
- pmd_t *page = pmd_alloc_one_fast(NULL, 0);
- if (!page)
- page = pmd_alloc_one(NULL, 0);
- pgd_set(pgd0, page);
- }
- pgd_cache = pgd_val(*pgd0) << 11UL;
- __asm__ __volatile__("stxa %0, [%1] %2nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (pgd_cache),
- "r" (TSB_REG),
- "i" (ASI_DMMU));
- }
- }
- t->w_saved = 0;
- /* Turn off performance counters if on. */
- if (t->flags & SPARC_FLAG_PERFCTR) {
- t->user_cntd0 = t->user_cntd1 = NULL;
- t->pcr_reg = 0;
- t->flags &= ~(SPARC_FLAG_PERFCTR);
- write_pcr(0);
- }
- /* Clear FPU register state. */
- t->fpsaved[0] = 0;
-
- if (t->current_ds.seg != ASI_AIUS)
- set_fs(USER_DS);
- /* Init new signal delivery disposition. */
- t->flags &= ~SPARC_FLAG_NEWSIGNALS;
- }
- /* It's a bit more tricky when 64-bit tasks are involved... */
- static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
- {
- unsigned long fp, distance, rval;
- if (!(current->thread.flags & SPARC_FLAG_32BIT)) {
- csp += STACK_BIAS;
- psp += STACK_BIAS;
- __get_user(fp, &(((struct reg_window *)psp)->ins[6]));
- fp += STACK_BIAS;
- } else
- __get_user(fp, &(((struct reg_window32 *)psp)->ins[6]));
- /* Now 8-byte align the stack as this is mandatory in the
- * Sparc ABI due to how register windows work. This hides
- * the restriction from thread libraries etc. -DaveM
- */
- csp &= ~7UL;
- distance = fp - psp;
- rval = (csp - distance);
- if (copy_in_user(rval, psp, distance))
- rval = 0;
- else if (current->thread.flags & SPARC_FLAG_32BIT) {
- if (put_user(((u32)csp), &(((struct reg_window32 *)rval)->ins[6])))
- rval = 0;
- } else {
- if (put_user(((u64)csp - STACK_BIAS),
- &(((struct reg_window *)rval)->ins[6])))
- rval = 0;
- else
- rval = rval - STACK_BIAS;
- }
- return rval;
- }
- /* Standard stuff. */
- static inline void shift_window_buffer(int first_win, int last_win,
- struct thread_struct *t)
- {
- int i;
- for (i = first_win; i < last_win; i++) {
- t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
- memcpy(&t->reg_window[i], &t->reg_window[i+1],
- sizeof(struct reg_window));
- }
- }
- void synchronize_user_stack(void)
- {
- struct thread_struct *t = ¤t->thread;
- unsigned long window;
- flush_user_windows();
- if ((window = t->w_saved) != 0) {
- int winsize = REGWIN_SZ;
- int bias = 0;
- if (t->flags & SPARC_FLAG_32BIT)
- winsize = REGWIN32_SZ;
- else
- bias = STACK_BIAS;
- window -= 1;
- do {
- unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
- struct reg_window *rwin = &t->reg_window[window];
- if (!copy_to_user((char *)sp, rwin, winsize)) {
- shift_window_buffer(window, t->w_saved - 1, t);
- t->w_saved--;
- }
- } while (window--);
- }
- }
- void fault_in_user_windows(void)
- {
- struct thread_struct *t = ¤t->thread;
- unsigned long window;
- int winsize = REGWIN_SZ;
- int bias = 0;
- if (t->flags & SPARC_FLAG_32BIT)
- winsize = REGWIN32_SZ;
- else
- bias = STACK_BIAS;
- flush_user_windows();
- window = t->w_saved;
- if (window != 0) {
- window -= 1;
- do {
- unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
- struct reg_window *rwin = &t->reg_window[window];
- if (copy_to_user((char *)sp, rwin, winsize))
- goto barf;
- } while (window--);
- }
- t->w_saved = 0;
- return;
- barf:
- t->w_saved = window + 1;
- do_exit(SIGILL);
- }
- /* Copy a Sparc thread. The fork() return value conventions
- * under SunOS are nothing short of bletcherous:
- * Parent --> %o0 == childs pid, %o1 == 0
- * Child --> %o0 == parents pid, %o1 == 1
- *
- * NOTE: We have a separate fork kpsr/kwim because
- * the parent could change these values between
- * sys_fork invocation and when we reach here
- * if the parent should sleep while trying to
- * allocate the task_struct and kernel stack in
- * do_fork().
- */
- int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
- unsigned long unused,
- struct task_struct *p, struct pt_regs *regs)
- {
- struct thread_struct *t = &p->thread;
- char *child_trap_frame;
- #ifdef CONFIG_DEBUG_SPINLOCK
- t->smp_lock_count = 0;
- t->smp_lock_pc = 0;
- #endif
- /* Calculate offset to stack_frame & pt_regs */
- child_trap_frame = ((char *)p) + (THREAD_SIZE - (TRACEREG_SZ+REGWIN_SZ));
- memcpy(child_trap_frame, (((struct reg_window *)regs)-1), (TRACEREG_SZ+REGWIN_SZ));
- t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
- t->flags |= SPARC_FLAG_NEWCHILD;
- t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct reg_window));
- t->cwp = (regs->tstate + 1) & TSTATE_CWP;
- t->fpsaved[0] = 0;
- if (regs->tstate & TSTATE_PRIV) {
- /* Special case, if we are spawning a kernel thread from
- * a userspace task (via KMOD, NFS, or similar) we must
- * disable performance counters in the child because the
- * address space and protection realm are changing.
- */
- if (t->flags & SPARC_FLAG_PERFCTR) {
- t->user_cntd0 = t->user_cntd1 = NULL;
- t->pcr_reg = 0;
- t->flags &= ~(SPARC_FLAG_PERFCTR);
- }
- t->kregs->u_regs[UREG_FP] = p->thread.ksp;
- t->current_ds = KERNEL_DS;
- flush_register_windows();
- memcpy((void *)(t->ksp + STACK_BIAS),
- (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
- sizeof(struct reg_window));
- t->kregs->u_regs[UREG_G6] = (unsigned long) p;
- } else {
- if (t->flags & SPARC_FLAG_32BIT) {
- sp &= 0x00000000ffffffffUL;
- regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
- }
- t->kregs->u_regs[UREG_FP] = sp;
- t->current_ds = USER_DS;
- if (sp != regs->u_regs[UREG_FP]) {
- unsigned long csp;
- csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
- if (!csp)
- return -EFAULT;
- t->kregs->u_regs[UREG_FP] = csp;
- }
- if (t->utraps)
- t->utraps[0]++;
- }
- /* Set the return value for the child. */
- t->kregs->u_regs[UREG_I0] = current->pid;
- t->kregs->u_regs[UREG_I1] = 1;
- /* Set the second return value for the parent. */
- regs->u_regs[UREG_I1] = 0;
- return 0;
- }
- /*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be free'd until both the parent and the child have exited.
- */
- pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
- {
- long retval;
- /* If the parent runs before fn(arg) is called by the child,
- * the input registers of this function can be clobbered.
- * So we stash 'fn' and 'arg' into global registers which
- * will not be modified by the parent.
- */
- __asm__ __volatile("mov %4, %%g2nt" /* Save FN into global */
- "mov %5, %%g3nt" /* Save ARG into global */
- "mov %1, %%g1nt" /* Clone syscall nr. */
- "mov %2, %%o0nt" /* Clone flags. */
- "mov 0, %%o1nt" /* usp arg == 0 */
- "t 0x6dnt" /* Linux/Sparc clone(). */
- "brz,a,pn %%o1, 1fnt" /* Parent, just return. */
- " mov %%o0, %0nt"
- "jmpl %%g2, %%o7nt" /* Call the function. */
- " mov %%g3, %%o0nt" /* Set arg in delay. */
- "mov %3, %%g1nt"
- "t 0x6dnt" /* Linux/Sparc exit(). */
- /* Notreached by child. */
- "1:" :
- "=r" (retval) :
- "i" (__NR_clone), "r" (flags | CLONE_VM),
- "i" (__NR_exit), "r" (fn), "r" (arg) :
- "g1", "g2", "g3", "o0", "o1", "memory", "cc");
- return retval;
- }
- /*
- * fill in the user structure for a core dump..
- */
- void dump_thread(struct pt_regs * regs, struct user * dump)
- {
- #if 1
- /* Only should be used for SunOS and ancient a.out
- * SparcLinux binaries... Fixme some day when bored.
- * But for now at least plug the security hole :-)
- */
- memset(dump, 0, sizeof(struct user));
- #else
- unsigned long first_stack_page;
- dump->magic = SUNOS_CORE_MAGIC;
- dump->len = sizeof(struct user);
- dump->regs.psr = regs->psr;
- dump->regs.pc = regs->pc;
- dump->regs.npc = regs->npc;
- dump->regs.y = regs->y;
- /* fuck me plenty */
- memcpy(&dump->regs.regs[0], ®s->u_regs[1], (sizeof(unsigned long) * 15));
- dump->u_tsize = (((unsigned long) current->mm->end_code) -
- ((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1);
- dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1)));
- dump->u_dsize -= dump->u_tsize;
- dump->u_dsize &= ~(PAGE_SIZE - 1);
- first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1));
- dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1);
- memcpy(&dump->fpu.fpstatus.fregs.regs[0], ¤t->thread.float_regs[0], (sizeof(unsigned long) * 32));
- dump->fpu.fpstatus.fsr = current->thread.fsr;
- dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0;
- #endif
- }
- typedef struct {
- union {
- unsigned int pr_regs[32];
- unsigned long pr_dregs[16];
- } pr_fr;
- unsigned int __unused;
- unsigned int pr_fsr;
- unsigned char pr_qcnt;
- unsigned char pr_q_entrysize;
- unsigned char pr_en;
- unsigned int pr_q[64];
- } elf_fpregset_t32;
- /*
- * fill in the fpu structure for a core dump.
- */
- int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
- {
- unsigned long *kfpregs = (unsigned long *)(((char *)current) + AOFF_task_fpregs);
- unsigned long fprs = current->thread.fpsaved[0];
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
- if (fprs & FPRS_DL)
- memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
- sizeof(unsigned int) * 32);
- else
- memset(&fpregs32->pr_fr.pr_regs[0], 0,
- sizeof(unsigned int) * 32);
- fpregs32->pr_qcnt = 0;
- fpregs32->pr_q_entrysize = 8;
- memset(&fpregs32->pr_q[0], 0,
- (sizeof(unsigned int) * 64));
- if (fprs & FPRS_FEF) {
- fpregs32->pr_fsr = (unsigned int) current->thread.xfsr[0];
- fpregs32->pr_en = 1;
- } else {
- fpregs32->pr_fsr = 0;
- fpregs32->pr_en = 0;
- }
- } else {
- if(fprs & FPRS_DL)
- memcpy(&fpregs->pr_regs[0], kfpregs,
- sizeof(unsigned int) * 32);
- else
- memset(&fpregs->pr_regs[0], 0,
- sizeof(unsigned int) * 32);
- if(fprs & FPRS_DU)
- memcpy(&fpregs->pr_regs[16], kfpregs+16,
- sizeof(unsigned int) * 32);
- else
- memset(&fpregs->pr_regs[16], 0,
- sizeof(unsigned int) * 32);
- if(fprs & FPRS_FEF) {
- fpregs->pr_fsr = current->thread.xfsr[0];
- fpregs->pr_gsr = current->thread.gsr[0];
- } else {
- fpregs->pr_fsr = fpregs->pr_gsr = 0;
- }
- fpregs->pr_fprs = fprs;
- }
- return 1;
- }
- /*
- * sparc_execve() executes a new program after the asm stub has set
- * things up for us. This should basically do what I want it to.
- */
- asmlinkage int sparc_execve(struct pt_regs *regs)
- {
- int error, base = 0;
- char *filename;
- /* User register window flush is done by entry.S */
- /* Check for indirect call. */
- if (regs->u_regs[UREG_G1] == 0)
- base = 1;
- filename = getname((char *)regs->u_regs[base + UREG_I0]);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename, (char **) regs->u_regs[base + UREG_I1],
- (char **) regs->u_regs[base + UREG_I2], regs);
- putname(filename);
- if (!error) {
- fprs_write(0);
- current->thread.xfsr[0] = 0;
- current->thread.fpsaved[0] = 0;
- regs->tstate &= ~TSTATE_PEF;
- }
- out:
- return error;
- }