492 lines
13 KiB
C
492 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* linux/arch/sparc/kernel/process.c
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*
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* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
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* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <stdarg.h>
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#include <linux/elfcore.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/smp.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <asm/auxio.h>
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#include <asm/oplib.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/delay.h>
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#include <asm/processor.h>
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#include <asm/psr.h>
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#include <asm/elf.h>
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#include <asm/prom.h>
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#include <asm/unistd.h>
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#include <asm/setup.h>
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#include "kernel.h"
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/*
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* Power management idle function
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* Set in pm platform drivers (apc.c and pmc.c)
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*/
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void (*sparc_idle)(void);
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/*
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* Power-off handler instantiation for pm.h compliance
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* This is done via auxio, but could be used as a fallback
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* handler when auxio is not present-- unused for now...
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*/
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL(pm_power_off);
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/*
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* sysctl - toggle power-off restriction for serial console
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* systems in machine_power_off()
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*/
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int scons_pwroff = 1;
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extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
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struct task_struct *last_task_used_math = NULL;
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struct thread_info *current_set[NR_CPUS];
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/* Idle loop support. */
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void arch_cpu_idle(void)
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{
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if (sparc_idle)
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(*sparc_idle)();
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local_irq_enable();
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}
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/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
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void machine_halt(void)
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{
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local_irq_enable();
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mdelay(8);
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local_irq_disable();
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prom_halt();
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panic("Halt failed!");
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}
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void machine_restart(char * cmd)
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{
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char *p;
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local_irq_enable();
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mdelay(8);
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local_irq_disable();
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p = strchr (reboot_command, '\n');
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if (p) *p = 0;
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if (cmd)
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prom_reboot(cmd);
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if (*reboot_command)
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prom_reboot(reboot_command);
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prom_feval ("reset");
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panic("Reboot failed!");
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}
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void machine_power_off(void)
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{
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if (auxio_power_register &&
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(!of_node_is_type(of_console_device, "serial") || scons_pwroff)) {
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u8 power_register = sbus_readb(auxio_power_register);
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power_register |= AUXIO_POWER_OFF;
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sbus_writeb(power_register, auxio_power_register);
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}
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machine_halt();
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}
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void show_regs(struct pt_regs *r)
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{
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struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
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show_regs_print_info(KERN_DEFAULT);
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printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
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r->psr, r->pc, r->npc, r->y, print_tainted());
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printk("PC: <%pS>\n", (void *) r->pc);
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printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
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r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
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printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
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r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
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printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
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printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
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rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
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printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
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rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
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}
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/*
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* The show_stack is an external API which we do not use ourselves.
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* The oops is printed in die_if_kernel.
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*/
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void show_stack(struct task_struct *tsk, unsigned long *_ksp)
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{
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unsigned long pc, fp;
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unsigned long task_base;
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struct reg_window32 *rw;
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int count = 0;
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if (!tsk)
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tsk = current;
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if (tsk == current && !_ksp)
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__asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp));
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task_base = (unsigned long) task_stack_page(tsk);
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fp = (unsigned long) _ksp;
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do {
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/* Bogus frame pointer? */
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if (fp < (task_base + sizeof(struct thread_info)) ||
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fp >= (task_base + (PAGE_SIZE << 1)))
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break;
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rw = (struct reg_window32 *) fp;
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pc = rw->ins[7];
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printk("[%08lx : ", pc);
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printk("%pS ] ", (void *) pc);
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fp = rw->ins[6];
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} while (++count < 16);
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printk("\n");
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}
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/*
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* Free current thread data structures etc..
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*/
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void exit_thread(struct task_struct *tsk)
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{
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#ifndef CONFIG_SMP
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if (last_task_used_math == tsk) {
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#else
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if (test_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU)) {
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#endif
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/* Keep process from leaving FPU in a bogon state. */
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put_psr(get_psr() | PSR_EF);
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fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr,
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&tsk->thread.fpqueue[0], &tsk->thread.fpqdepth);
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#ifndef CONFIG_SMP
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last_task_used_math = NULL;
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#else
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clear_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU);
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#endif
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}
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}
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void flush_thread(void)
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{
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current_thread_info()->w_saved = 0;
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#ifndef CONFIG_SMP
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if(last_task_used_math == current) {
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#else
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if (test_thread_flag(TIF_USEDFPU)) {
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#endif
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/* Clean the fpu. */
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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#ifndef CONFIG_SMP
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last_task_used_math = NULL;
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#else
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clear_thread_flag(TIF_USEDFPU);
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#endif
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}
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/* This task is no longer a kernel thread. */
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if (current->thread.flags & SPARC_FLAG_KTHREAD) {
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current->thread.flags &= ~SPARC_FLAG_KTHREAD;
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/* We must fixup kregs as well. */
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/* XXX This was not fixed for ti for a while, worked. Unused? */
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current->thread.kregs = (struct pt_regs *)
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(task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
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}
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}
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static inline struct sparc_stackf __user *
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clone_stackframe(struct sparc_stackf __user *dst,
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struct sparc_stackf __user *src)
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{
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unsigned long size, fp;
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struct sparc_stackf *tmp;
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struct sparc_stackf __user *sp;
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if (get_user(tmp, &src->fp))
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return NULL;
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fp = (unsigned long) tmp;
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size = (fp - ((unsigned long) src));
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fp = (unsigned long) dst;
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sp = (struct sparc_stackf __user *)(fp - size);
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/* do_fork() grabs the parent semaphore, we must release it
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* temporarily so we can build the child clone stack frame
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* without deadlocking.
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*/
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if (__copy_user(sp, src, size))
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sp = NULL;
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else if (put_user(fp, &sp->fp))
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sp = NULL;
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return sp;
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}
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asmlinkage int sparc_do_fork(unsigned long clone_flags,
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unsigned long stack_start,
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struct pt_regs *regs,
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unsigned long stack_size)
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{
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unsigned long parent_tid_ptr, child_tid_ptr;
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unsigned long orig_i1 = regs->u_regs[UREG_I1];
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long ret;
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parent_tid_ptr = regs->u_regs[UREG_I2];
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child_tid_ptr = regs->u_regs[UREG_I4];
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ret = do_fork(clone_flags, stack_start, stack_size,
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(int __user *) parent_tid_ptr,
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(int __user *) child_tid_ptr);
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/* If we get an error and potentially restart the system
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* call, we're screwed because copy_thread() clobbered
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* the parent's %o1. So detect that case and restore it
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* here.
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*/
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if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
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regs->u_regs[UREG_I1] = orig_i1;
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return ret;
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}
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/* Copy a Sparc thread. The fork() return value conventions
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* under SunOS are nothing short of bletcherous:
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* Parent --> %o0 == childs pid, %o1 == 0
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* Child --> %o0 == parents pid, %o1 == 1
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*
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* NOTE: We have a separate fork kpsr/kwim because
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* the parent could change these values between
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* sys_fork invocation and when we reach here
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* if the parent should sleep while trying to
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* allocate the task_struct and kernel stack in
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* do_fork().
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* XXX See comment above sys_vfork in sparc64. todo.
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*/
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extern void ret_from_fork(void);
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extern void ret_from_kernel_thread(void);
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int copy_thread(unsigned long clone_flags, unsigned long sp,
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unsigned long arg, struct task_struct *p)
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{
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struct thread_info *ti = task_thread_info(p);
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struct pt_regs *childregs, *regs = current_pt_regs();
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char *new_stack;
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#ifndef CONFIG_SMP
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if(last_task_used_math == current) {
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#else
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if (test_thread_flag(TIF_USEDFPU)) {
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#endif
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put_psr(get_psr() | PSR_EF);
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fpsave(&p->thread.float_regs[0], &p->thread.fsr,
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&p->thread.fpqueue[0], &p->thread.fpqdepth);
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}
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/*
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* p->thread_info new_stack childregs stack bottom
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* ! ! ! !
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* V V (stk.fr.) V (pt_regs) V
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* +----- - - - - - ------+===========+=============+
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*/
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new_stack = task_stack_page(p) + THREAD_SIZE;
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new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
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childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
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/*
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* A new process must start with interrupts disabled, see schedule_tail()
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* and finish_task_switch(). (If we do not do it and if a timer interrupt
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* hits before we unlock and attempts to take the rq->lock, we deadlock.)
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*
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* Thus, kpsr |= PSR_PIL.
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*/
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ti->ksp = (unsigned long) new_stack;
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p->thread.kregs = childregs;
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if (unlikely(p->flags & PF_KTHREAD)) {
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extern int nwindows;
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unsigned long psr;
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memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
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p->thread.flags |= SPARC_FLAG_KTHREAD;
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p->thread.current_ds = KERNEL_DS;
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ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
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childregs->u_regs[UREG_G1] = sp; /* function */
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childregs->u_regs[UREG_G2] = arg;
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psr = childregs->psr = get_psr();
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ti->kpsr = psr | PSR_PIL;
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ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
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return 0;
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}
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memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
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childregs->u_regs[UREG_FP] = sp;
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p->thread.flags &= ~SPARC_FLAG_KTHREAD;
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p->thread.current_ds = USER_DS;
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ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
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ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
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ti->kwim = current->thread.fork_kwim;
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if (sp != regs->u_regs[UREG_FP]) {
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struct sparc_stackf __user *childstack;
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struct sparc_stackf __user *parentstack;
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/*
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* This is a clone() call with supplied user stack.
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* Set some valid stack frames to give to the child.
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*/
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childstack = (struct sparc_stackf __user *)
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(sp & ~0xfUL);
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parentstack = (struct sparc_stackf __user *)
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regs->u_regs[UREG_FP];
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#if 0
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printk("clone: parent stack:\n");
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show_stackframe(parentstack);
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#endif
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childstack = clone_stackframe(childstack, parentstack);
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if (!childstack)
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return -EFAULT;
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#if 0
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printk("clone: child stack:\n");
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show_stackframe(childstack);
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#endif
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childregs->u_regs[UREG_FP] = (unsigned long)childstack;
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}
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#ifdef CONFIG_SMP
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/* FPU must be disabled on SMP. */
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childregs->psr &= ~PSR_EF;
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clear_tsk_thread_flag(p, TIF_USEDFPU);
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#endif
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/* Set the return value for the child. */
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childregs->u_regs[UREG_I0] = current->pid;
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childregs->u_regs[UREG_I1] = 1;
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/* Set the return value for the parent. */
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regs->u_regs[UREG_I1] = 0;
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if (clone_flags & CLONE_SETTLS)
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childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
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return 0;
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}
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/*
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* fill in the fpu structure for a core dump.
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*/
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int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
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{
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if (used_math()) {
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memset(fpregs, 0, sizeof(*fpregs));
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fpregs->pr_q_entrysize = 8;
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return 1;
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}
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#ifdef CONFIG_SMP
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if (test_thread_flag(TIF_USEDFPU)) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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if (regs != NULL) {
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regs->psr &= ~(PSR_EF);
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clear_thread_flag(TIF_USEDFPU);
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}
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}
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#else
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if (current == last_task_used_math) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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if (regs != NULL) {
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regs->psr &= ~(PSR_EF);
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last_task_used_math = NULL;
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}
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}
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#endif
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memcpy(&fpregs->pr_fr.pr_regs[0],
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¤t->thread.float_regs[0],
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(sizeof(unsigned long) * 32));
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fpregs->pr_fsr = current->thread.fsr;
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fpregs->pr_qcnt = current->thread.fpqdepth;
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fpregs->pr_q_entrysize = 8;
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fpregs->pr_en = 1;
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if(fpregs->pr_qcnt != 0) {
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memcpy(&fpregs->pr_q[0],
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¤t->thread.fpqueue[0],
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sizeof(struct fpq) * fpregs->pr_qcnt);
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}
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/* Zero out the rest. */
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memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
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sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
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return 1;
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}
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unsigned long get_wchan(struct task_struct *task)
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{
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unsigned long pc, fp, bias = 0;
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unsigned long task_base = (unsigned long) task;
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unsigned long ret = 0;
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struct reg_window32 *rw;
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int count = 0;
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if (!task || task == current ||
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task->state == TASK_RUNNING)
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goto out;
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fp = task_thread_info(task)->ksp + bias;
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do {
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/* Bogus frame pointer? */
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if (fp < (task_base + sizeof(struct thread_info)) ||
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fp >= (task_base + (2 * PAGE_SIZE)))
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break;
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rw = (struct reg_window32 *) fp;
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pc = rw->ins[7];
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if (!in_sched_functions(pc)) {
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ret = pc;
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goto out;
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}
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fp = rw->ins[6] + bias;
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} while (++count < 16);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|