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-rw-r--r--arch/sparc64/kernel/process.c869
1 files changed, 869 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
new file mode 100644
index 000000000000..26d3ec41da1c
--- /dev/null
+++ b/arch/sparc64/kernel/process.c
@@ -0,0 +1,869 @@
+/* $Id: process.c,v 1.131 2002/02/09 19:49:30 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..
+ */
+
+#include <stdarg.h>
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/kallsyms.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.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 <linux/compat.h>
+#include <linux/init.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>
+#include <asm/head.h>
+#include <asm/cpudata.h>
+#include <asm/unistd.h>
+
+/* #define VERBOSE_SHOWREGS */
+
+/*
+ * Nothing special yet...
+ */
+void default_idle(void)
+{
+}
+
+#ifndef CONFIG_SMP
+
+/*
+ * the idle loop on a Sparc... ;)
+ */
+void cpu_idle(void)
+{
+ if (current->pid != 0)
+ return;
+
+ /* endless idle loop with no priority at all */
+ for (;;) {
+ /* If current->work.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 (!need_resched())
+ barrier();
+
+ schedule();
+ check_pgt_cache();
+ }
+ return;
+}
+
+#else
+
+/*
+ * the idle loop on a UltraMultiPenguin...
+ */
+#define idle_me_harder() (cpu_data(smp_processor_id()).idle_volume += 1)
+#define unidle_me() (cpu_data(smp_processor_id()).idle_volume = 0)
+void cpu_idle(void)
+{
+ set_thread_flag(TIF_POLLING_NRFLAG);
+ while(1) {
+ if (need_resched()) {
+ unidle_me();
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ schedule();
+ set_thread_flag(TIF_POLLING_NRFLAG);
+ 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 [];
+
+extern void (*prom_palette)(int);
+extern void (*prom_keyboard)(void);
+
+void machine_halt(void)
+{
+ if (!serial_console && prom_palette)
+ prom_palette (1);
+ if (prom_keyboard)
+ prom_keyboard();
+ prom_halt();
+ panic("Halt failed!");
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_alt_power_off(void)
+{
+ if (!serial_console && prom_palette)
+ prom_palette(1);
+ if (prom_keyboard)
+ prom_keyboard();
+ prom_halt_power_off();
+ panic("Power-off failed!");
+}
+
+void machine_restart(char * cmd)
+{
+ char *p;
+
+ p = strchr (reboot_command, '\n');
+ if (p) *p = 0;
+ if (!serial_console && prom_palette)
+ prom_palette (1);
+ if (prom_keyboard)
+ prom_keyboard();
+ if (cmd)
+ prom_reboot(cmd);
+ if (*reboot_command)
+ prom_reboot(reboot_command);
+ prom_reboot("");
+ panic("Reboot failed!");
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+static void show_regwindow32(struct pt_regs *regs)
+{
+ struct reg_window32 __user *rw;
+ struct reg_window32 r_w;
+ mm_segment_t old_fs;
+
+ __asm__ __volatile__ ("flushw");
+ rw = compat_ptr((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;
+ }
+
+ set_fs (old_fs);
+ printk("l0: %08x l1: %08x l2: %08x l3: %08x "
+ "l4: %08x l5: %08x l6: %08x l7: %08x\n",
+ r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
+ r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
+ printk("i0: %08x i1: %08x i2: %08x i3: %08x "
+ "i4: %08x i5: %08x i6: %08x i7: %08x\n",
+ r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
+ r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
+}
+
+static void show_regwindow(struct pt_regs *regs)
+{
+ struct reg_window __user *rw;
+ struct reg_window *rwk;
+ struct reg_window r_w;
+ mm_segment_t old_fs;
+
+ if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
+ __asm__ __volatile__ ("flushw");
+ rw = (struct reg_window __user *)
+ (regs->u_regs[14] + STACK_BIAS);
+ rwk = (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;
+ }
+ rwk = &r_w;
+ set_fs (old_fs);
+ }
+ } else {
+ show_regwindow32(regs);
+ return;
+ }
+ printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
+ rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
+ printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
+ rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
+ printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
+ rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
+ printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
+ rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
+ if (regs->tstate & TSTATE_PRIV)
+ print_symbol("I7: <%s>\n", rwk->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: %016lx\n"
+ "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
+ 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: %016lx\n"
+ "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
+ 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: %016lx\n"
+ "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
+ (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: %016lx\n", 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: %08x\n",
+ sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
+ printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
+ sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
+ printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
+ sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
+ printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
+ sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
+ printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
+ "x3: %08x x4: %08x x5: %08x xx: %08x\n",
+ 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: %08x\n", i++, *stk++);
+ } while ((size -= sizeof(unsigned)));
+}
+
+#ifdef CONFIG_SMP
+static DEFINE_SPINLOCK(regdump_lock);
+#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, %0\n\t"
+ "wrpr %0, %1, %%pstate"
+ : "=r" (flags)
+ : "i" (PSTATE_IE));
+ spin_lock(&regdump_lock);
+#endif
+ printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
+ regs->tpc, regs->tnpc, regs->y, print_tainted());
+ print_symbol("TPC: <%s>\n", regs->tpc);
+ printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
+ regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
+ regs->u_regs[3]);
+ printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
+ regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
+ regs->u_regs[7]);
+ printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
+ 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: %016lx\n",
+ regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
+ regs->u_regs[15]);
+ print_symbol("RPC: <%s>\n", regs->u_regs[15]);
+ show_regwindow(regs);
+#ifdef CONFIG_SMP
+ spin_unlock(&regdump_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] + PTREGS_OFF));
+ idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
+ printk ("*********endpar**********\n");
+ }
+#endif
+}
+
+void show_regs32(struct pt_regs32 *regs)
+{
+ printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", 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: %08x\n",
+ 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: %08x\n",
+ regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
+ regs->u_regs[15]);
+}
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+ struct thread_info *ti = tsk->thread_info;
+ unsigned long ret = 0xdeadbeefUL;
+
+ if (ti && ti->ksp) {
+ unsigned long *sp;
+ sp = (unsigned long *)(ti->ksp + STACK_BIAS);
+ if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
+ sp[14]) {
+ unsigned long *fp;
+ fp = (unsigned long *)(sp[14] + STACK_BIAS);
+ if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
+ ret = fp[15];
+ }
+ }
+ return ret;
+}
+
+/* Free current thread data structures etc.. */
+void exit_thread(void)
+{
+ struct thread_info *t = current_thread_info();
+
+ if (t->utraps) {
+ if (t->utraps[0] < 2)
+ kfree (t->utraps);
+ else
+ t->utraps[0]--;
+ }
+
+ if (test_and_clear_thread_flag(TIF_PERFCTR)) {
+ t->user_cntd0 = t->user_cntd1 = NULL;
+ t->pcr_reg = 0;
+ write_pcr(0);
+ }
+}
+
+void flush_thread(void)
+{
+ struct thread_info *t = current_thread_info();
+
+ if (t->flags & _TIF_ABI_PENDING)
+ t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
+
+ if (t->task->mm) {
+ unsigned long pgd_cache = 0UL;
+ if (test_thread_flag(TIF_32BIT)) {
+ struct mm_struct *mm = t->task->mm;
+ pgd_t *pgd0 = &mm->pgd[0];
+ pud_t *pud0 = pud_offset(pgd0, 0);
+
+ if (pud_none(*pud0)) {
+ pmd_t *page = pmd_alloc_one(mm, 0);
+ pud_set(pud0, page);
+ }
+ pgd_cache = get_pgd_cache(pgd0);
+ }
+ __asm__ __volatile__("stxa %0, [%1] %2\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (pgd_cache),
+ "r" (TSB_REG),
+ "i" (ASI_DMMU));
+ }
+ set_thread_wsaved(0);
+
+ /* Turn off performance counters if on. */
+ if (test_and_clear_thread_flag(TIF_PERFCTR)) {
+ t->user_cntd0 = t->user_cntd1 = NULL;
+ t->pcr_reg = 0;
+ write_pcr(0);
+ }
+
+ /* Clear FPU register state. */
+ t->fpsaved[0] = 0;
+
+ if (get_thread_current_ds() != ASI_AIUS)
+ set_fs(USER_DS);
+
+ /* Init new signal delivery disposition. */
+ clear_thread_flag(TIF_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 (!(test_thread_flag(TIF_32BIT))) {
+ csp += STACK_BIAS;
+ psp += STACK_BIAS;
+ __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
+ fp += STACK_BIAS;
+ } else
+ __get_user(fp, &(((struct reg_window32 __user *)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((void __user *) rval, (void __user *) psp, distance))
+ rval = 0;
+ else if (test_thread_flag(TIF_32BIT)) {
+ if (put_user(((u32)csp),
+ &(((struct reg_window32 __user *)rval)->ins[6])))
+ rval = 0;
+ } else {
+ if (put_user(((u64)csp - STACK_BIAS),
+ &(((struct reg_window __user *)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_info *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_info *t = current_thread_info();
+ unsigned long window;
+
+ flush_user_windows();
+ if ((window = get_thread_wsaved()) != 0) {
+ int winsize = sizeof(struct reg_window);
+ int bias = 0;
+
+ if (test_thread_flag(TIF_32BIT))
+ winsize = sizeof(struct reg_window32);
+ 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 __user *)sp, rwin, winsize)) {
+ shift_window_buffer(window, get_thread_wsaved() - 1, t);
+ set_thread_wsaved(get_thread_wsaved() - 1);
+ }
+ } while (window--);
+ }
+}
+
+void fault_in_user_windows(void)
+{
+ struct thread_info *t = current_thread_info();
+ unsigned long window;
+ int winsize = sizeof(struct reg_window);
+ int bias = 0;
+
+ if (test_thread_flag(TIF_32BIT))
+ winsize = sizeof(struct reg_window32);
+ else
+ bias = STACK_BIAS;
+
+ flush_user_windows();
+ window = get_thread_wsaved();
+
+ 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 __user *)sp, rwin, winsize))
+ goto barf;
+ } while (window--);
+ }
+ set_thread_wsaved(0);
+ return;
+
+barf:
+ set_thread_wsaved(window + 1);
+ do_exit(SIGILL);
+}
+
+asmlinkage long sparc_do_fork(unsigned long clone_flags,
+ unsigned long stack_start,
+ struct pt_regs *regs,
+ unsigned long stack_size)
+{
+ int __user *parent_tid_ptr, *child_tid_ptr;
+
+#ifdef CONFIG_COMPAT
+ if (test_thread_flag(TIF_32BIT)) {
+ parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
+ child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
+ } else
+#endif
+ {
+ parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
+ child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
+ }
+
+ return do_fork(clone_flags, stack_start,
+ regs, stack_size,
+ parent_tid_ptr, child_tid_ptr);
+}
+
+/* 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
+ */
+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_info *t = p->thread_info;
+ char *child_trap_frame;
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+ p->thread.smp_lock_count = 0;
+ p->thread.smp_lock_pc = 0;
+#endif
+
+ /* Calculate offset to stack_frame & pt_regs */
+ child_trap_frame = ((char *)t) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
+ memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
+
+ t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
+ _TIF_NEWCHILD |
+ (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
+ t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
+ t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
+ 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 & _TIF_PERFCTR) {
+ t->user_cntd0 = t->user_cntd1 = NULL;
+ t->pcr_reg = 0;
+ t->flags &= ~_TIF_PERFCTR;
+ }
+ t->kregs->u_regs[UREG_FP] = t->ksp;
+ t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
+ flush_register_windows();
+ memcpy((void *)(t->ksp + STACK_BIAS),
+ (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
+ sizeof(struct sparc_stackf));
+ t->kregs->u_regs[UREG_G6] = (unsigned long) t;
+ t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
+ } else {
+ if (t->flags & _TIF_32BIT) {
+ sp &= 0x00000000ffffffffUL;
+ regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
+ }
+ t->kregs->u_regs[UREG_FP] = sp;
+ t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
+ 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;
+
+ if (clone_flags & CLONE_SETTLS)
+ t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
+
+ 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, %%g2\n\t" /* Save FN into global */
+ "mov %5, %%g3\n\t" /* Save ARG into global */
+ "mov %1, %%g1\n\t" /* Clone syscall nr. */
+ "mov %2, %%o0\n\t" /* Clone flags. */
+ "mov 0, %%o1\n\t" /* usp arg == 0 */
+ "t 0x6d\n\t" /* Linux/Sparc clone(). */
+ "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
+ " mov %%o0, %0\n\t"
+ "jmpl %%g2, %%o7\n\t" /* Call the function. */
+ " mov %%g3, %%o0\n\t" /* Set arg in delay. */
+ "mov %3, %%g1\n\t"
+ "t 0x6d\n\t" /* Linux/Sparc exit(). */
+ /* Notreached by child. */
+ "1:" :
+ "=r" (retval) :
+ "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
+ "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)
+{
+ /* Only should be used for SunOS and ancient a.out
+ * SparcLinux binaries... Not worth implementing.
+ */
+ memset(dump, 0, sizeof(struct user));
+}
+
+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 = current_thread_info()->fpregs;
+ unsigned long fprs = current_thread_info()->fpsaved[0];
+
+ if (test_thread_flag(TIF_32BIT)) {
+ 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_info()->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_info()->xfsr[0];
+ fpregs->pr_gsr = current_thread_info()->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 __user *)regs->u_regs[base + UREG_I0]);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename,
+ (char __user * __user *)
+ regs->u_regs[base + UREG_I1],
+ (char __user * __user *)
+ regs->u_regs[base + UREG_I2], regs);
+ putname(filename);
+ if (!error) {
+ fprs_write(0);
+ current_thread_info()->xfsr[0] = 0;
+ current_thread_info()->fpsaved[0] = 0;
+ regs->tstate &= ~TSTATE_PEF;
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
+ }
+out:
+ return error;
+}
+
+unsigned long get_wchan(struct task_struct *task)
+{
+ unsigned long pc, fp, bias = 0;
+ unsigned long thread_info_base;
+ struct reg_window *rw;
+ unsigned long ret = 0;
+ int count = 0;
+
+ if (!task || task == current ||
+ task->state == TASK_RUNNING)
+ goto out;
+
+ thread_info_base = (unsigned long) task->thread_info;
+ bias = STACK_BIAS;
+ fp = task->thread_info->ksp + bias;
+
+ do {
+ /* Bogus frame pointer? */
+ if (fp < (thread_info_base + sizeof(struct thread_info)) ||
+ fp >= (thread_info_base + THREAD_SIZE))
+ break;
+ rw = (struct reg_window *) fp;
+ pc = rw->ins[7];
+ if (!in_sched_functions(pc)) {
+ ret = pc;
+ goto out;
+ }
+ fp = rw->ins[6] + bias;
+ } while (++count < 16);
+
+out:
+ return ret;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.