576 lines
16 KiB
C
576 lines
16 KiB
C
/*
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* arch/sh/kernel/process_64.c
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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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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2007 Paul Mundt
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* Copyright (C) 2003, 2004 Richard Curnow
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*
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* Started from SH3/4 version:
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* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
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*
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* In turn started from i386 version:
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* Copyright (C) 1995 Linus Torvalds
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/ptrace.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <asm/syscalls.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/mmu_context.h>
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#include <asm/fpu.h>
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struct task_struct *last_task_used_math = NULL;
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void machine_restart(char * __unused)
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{
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extern void phys_stext(void);
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phys_stext();
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}
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void machine_halt(void)
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{
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for (;;);
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}
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void machine_power_off(void)
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{
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__asm__ __volatile__ (
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"sleep\n\t"
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"synci\n\t"
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"nop;nop;nop;nop\n\t"
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);
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panic("Unexpected wakeup!\n");
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}
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void show_regs(struct pt_regs * regs)
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{
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unsigned long long ah, al, bh, bl, ch, cl;
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printk("\n");
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ah = (regs->pc) >> 32;
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al = (regs->pc) & 0xffffffff;
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bh = (regs->regs[18]) >> 32;
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bl = (regs->regs[18]) & 0xffffffff;
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ch = (regs->regs[15]) >> 32;
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cl = (regs->regs[15]) & 0xffffffff;
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printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->sr) >> 32;
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al = (regs->sr) & 0xffffffff;
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asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
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asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
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bh = (bh) >> 32;
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bl = (bl) & 0xffffffff;
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asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
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asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
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ch = (ch) >> 32;
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cl = (cl) & 0xffffffff;
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printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[0]) >> 32;
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al = (regs->regs[0]) & 0xffffffff;
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bh = (regs->regs[1]) >> 32;
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bl = (regs->regs[1]) & 0xffffffff;
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ch = (regs->regs[2]) >> 32;
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cl = (regs->regs[2]) & 0xffffffff;
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printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[3]) >> 32;
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al = (regs->regs[3]) & 0xffffffff;
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bh = (regs->regs[4]) >> 32;
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bl = (regs->regs[4]) & 0xffffffff;
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ch = (regs->regs[5]) >> 32;
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cl = (regs->regs[5]) & 0xffffffff;
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printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[6]) >> 32;
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al = (regs->regs[6]) & 0xffffffff;
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bh = (regs->regs[7]) >> 32;
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bl = (regs->regs[7]) & 0xffffffff;
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ch = (regs->regs[8]) >> 32;
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cl = (regs->regs[8]) & 0xffffffff;
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printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[9]) >> 32;
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al = (regs->regs[9]) & 0xffffffff;
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bh = (regs->regs[10]) >> 32;
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bl = (regs->regs[10]) & 0xffffffff;
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ch = (regs->regs[11]) >> 32;
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cl = (regs->regs[11]) & 0xffffffff;
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printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[12]) >> 32;
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al = (regs->regs[12]) & 0xffffffff;
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bh = (regs->regs[13]) >> 32;
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bl = (regs->regs[13]) & 0xffffffff;
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ch = (regs->regs[14]) >> 32;
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cl = (regs->regs[14]) & 0xffffffff;
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printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[16]) >> 32;
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al = (regs->regs[16]) & 0xffffffff;
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bh = (regs->regs[17]) >> 32;
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bl = (regs->regs[17]) & 0xffffffff;
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ch = (regs->regs[19]) >> 32;
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cl = (regs->regs[19]) & 0xffffffff;
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printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[20]) >> 32;
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al = (regs->regs[20]) & 0xffffffff;
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bh = (regs->regs[21]) >> 32;
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bl = (regs->regs[21]) & 0xffffffff;
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ch = (regs->regs[22]) >> 32;
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cl = (regs->regs[22]) & 0xffffffff;
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printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[23]) >> 32;
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al = (regs->regs[23]) & 0xffffffff;
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bh = (regs->regs[24]) >> 32;
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bl = (regs->regs[24]) & 0xffffffff;
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ch = (regs->regs[25]) >> 32;
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cl = (regs->regs[25]) & 0xffffffff;
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printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[26]) >> 32;
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al = (regs->regs[26]) & 0xffffffff;
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bh = (regs->regs[27]) >> 32;
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bl = (regs->regs[27]) & 0xffffffff;
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ch = (regs->regs[28]) >> 32;
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cl = (regs->regs[28]) & 0xffffffff;
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printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[29]) >> 32;
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al = (regs->regs[29]) & 0xffffffff;
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bh = (regs->regs[30]) >> 32;
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bl = (regs->regs[30]) & 0xffffffff;
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ch = (regs->regs[31]) >> 32;
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cl = (regs->regs[31]) & 0xffffffff;
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printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[32]) >> 32;
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al = (regs->regs[32]) & 0xffffffff;
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bh = (regs->regs[33]) >> 32;
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bl = (regs->regs[33]) & 0xffffffff;
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ch = (regs->regs[34]) >> 32;
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cl = (regs->regs[34]) & 0xffffffff;
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printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[35]) >> 32;
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al = (regs->regs[35]) & 0xffffffff;
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bh = (regs->regs[36]) >> 32;
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bl = (regs->regs[36]) & 0xffffffff;
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ch = (regs->regs[37]) >> 32;
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cl = (regs->regs[37]) & 0xffffffff;
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printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[38]) >> 32;
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al = (regs->regs[38]) & 0xffffffff;
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bh = (regs->regs[39]) >> 32;
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bl = (regs->regs[39]) & 0xffffffff;
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ch = (regs->regs[40]) >> 32;
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cl = (regs->regs[40]) & 0xffffffff;
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printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[41]) >> 32;
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al = (regs->regs[41]) & 0xffffffff;
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bh = (regs->regs[42]) >> 32;
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bl = (regs->regs[42]) & 0xffffffff;
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ch = (regs->regs[43]) >> 32;
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cl = (regs->regs[43]) & 0xffffffff;
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printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[44]) >> 32;
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al = (regs->regs[44]) & 0xffffffff;
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bh = (regs->regs[45]) >> 32;
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bl = (regs->regs[45]) & 0xffffffff;
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ch = (regs->regs[46]) >> 32;
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cl = (regs->regs[46]) & 0xffffffff;
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printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[47]) >> 32;
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al = (regs->regs[47]) & 0xffffffff;
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bh = (regs->regs[48]) >> 32;
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bl = (regs->regs[48]) & 0xffffffff;
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ch = (regs->regs[49]) >> 32;
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cl = (regs->regs[49]) & 0xffffffff;
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printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[50]) >> 32;
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al = (regs->regs[50]) & 0xffffffff;
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bh = (regs->regs[51]) >> 32;
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bl = (regs->regs[51]) & 0xffffffff;
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ch = (regs->regs[52]) >> 32;
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cl = (regs->regs[52]) & 0xffffffff;
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printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[53]) >> 32;
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al = (regs->regs[53]) & 0xffffffff;
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bh = (regs->regs[54]) >> 32;
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bl = (regs->regs[54]) & 0xffffffff;
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ch = (regs->regs[55]) >> 32;
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cl = (regs->regs[55]) & 0xffffffff;
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printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[56]) >> 32;
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al = (regs->regs[56]) & 0xffffffff;
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bh = (regs->regs[57]) >> 32;
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bl = (regs->regs[57]) & 0xffffffff;
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ch = (regs->regs[58]) >> 32;
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cl = (regs->regs[58]) & 0xffffffff;
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printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[59]) >> 32;
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al = (regs->regs[59]) & 0xffffffff;
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bh = (regs->regs[60]) >> 32;
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bl = (regs->regs[60]) & 0xffffffff;
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ch = (regs->regs[61]) >> 32;
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cl = (regs->regs[61]) & 0xffffffff;
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printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->regs[62]) >> 32;
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al = (regs->regs[62]) & 0xffffffff;
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bh = (regs->tregs[0]) >> 32;
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bl = (regs->tregs[0]) & 0xffffffff;
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ch = (regs->tregs[1]) >> 32;
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cl = (regs->tregs[1]) & 0xffffffff;
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printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->tregs[2]) >> 32;
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al = (regs->tregs[2]) & 0xffffffff;
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bh = (regs->tregs[3]) >> 32;
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bl = (regs->tregs[3]) & 0xffffffff;
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ch = (regs->tregs[4]) >> 32;
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cl = (regs->tregs[4]) & 0xffffffff;
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printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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ah = (regs->tregs[5]) >> 32;
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al = (regs->tregs[5]) & 0xffffffff;
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bh = (regs->tregs[6]) >> 32;
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bl = (regs->tregs[6]) & 0xffffffff;
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ch = (regs->tregs[7]) >> 32;
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cl = (regs->tregs[7]) & 0xffffffff;
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printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
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ah, al, bh, bl, ch, cl);
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/*
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* If we're in kernel mode, dump the stack too..
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*/
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if (!user_mode(regs)) {
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void show_stack(struct task_struct *tsk, unsigned long *sp);
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unsigned long sp = regs->regs[15] & 0xffffffff;
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struct task_struct *tsk = get_current();
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tsk->thread.kregs = regs;
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show_stack(tsk, (unsigned long *)sp);
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}
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}
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/*
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* Create a kernel thread
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*/
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ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
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{
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do_exit(fn(arg));
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}
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/*
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* This is the mechanism for creating a new kernel thread.
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*
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* NOTE! Only a kernel-only process(ie the swapper or direct descendants
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* who haven't done an "execve()") should use this: it will work within
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* a system call from a "real" process, but the process memory space will
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* not be freed until both the parent and the child have exited.
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*/
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int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
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{
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struct pt_regs regs;
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memset(®s, 0, sizeof(regs));
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regs.regs[2] = (unsigned long)arg;
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regs.regs[3] = (unsigned long)fn;
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regs.pc = (unsigned long)kernel_thread_helper;
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regs.sr = (1 << 30);
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/* Ok, create the new process.. */
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return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
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®s, 0, NULL, NULL);
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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(void)
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{
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/*
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* See arch/sparc/kernel/process.c for the precedent for doing
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* this -- RPC.
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*
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* The SH-5 FPU save/restore approach relies on
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* last_task_used_math pointing to a live task_struct. When
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* another task tries to use the FPU for the 1st time, the FPUDIS
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* trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
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* existing FPU state to the FP regs field within
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* last_task_used_math before re-loading the new task's FPU state
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* (or initialising it if the FPU has been used before). So if
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* last_task_used_math is stale, and its page has already been
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* re-allocated for another use, the consequences are rather
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* grim. Unless we null it here, there is no other path through
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* which it would get safely nulled.
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*/
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#ifdef CONFIG_SH_FPU
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if (last_task_used_math == current) {
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last_task_used_math = NULL;
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}
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#endif
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}
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void flush_thread(void)
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{
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/* Called by fs/exec.c (setup_new_exec) to remove traces of a
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* previously running executable. */
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#ifdef CONFIG_SH_FPU
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if (last_task_used_math == current) {
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last_task_used_math = NULL;
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}
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/* Force FPU state to be reinitialised after exec */
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clear_used_math();
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#endif
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/* if we are a kernel thread, about to change to user thread,
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* update kreg
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*/
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if(current->thread.kregs==&fake_swapper_regs) {
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current->thread.kregs =
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((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
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current->thread.uregs = current->thread.kregs;
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}
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}
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void release_thread(struct task_struct *dead_task)
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{
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/* do nothing */
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}
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/* Fill in the fpu structure for a core dump.. */
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
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{
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#ifdef CONFIG_SH_FPU
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int fpvalid;
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struct task_struct *tsk = current;
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fpvalid = !!tsk_used_math(tsk);
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if (fpvalid) {
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if (current == last_task_used_math) {
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enable_fpu();
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save_fpu(tsk, regs);
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disable_fpu();
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last_task_used_math = 0;
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regs->sr |= SR_FD;
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}
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memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
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}
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return fpvalid;
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#else
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return 0; /* Task didn't use the fpu at all. */
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#endif
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}
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asmlinkage void ret_from_fork(void);
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int copy_thread(unsigned long clone_flags, unsigned long usp,
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unsigned long unused,
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struct task_struct *p, struct pt_regs *regs)
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{
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struct pt_regs *childregs;
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#ifdef CONFIG_SH_FPU
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if(last_task_used_math == current) {
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enable_fpu();
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save_fpu(current, regs);
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disable_fpu();
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last_task_used_math = NULL;
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regs->sr |= SR_FD;
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}
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#endif
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/* Copy from sh version */
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childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
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|
|
*childregs = *regs;
|
|
|
|
/*
|
|
* Sign extend the edited stack.
|
|
* Note that thread.pc and thread.pc will stay
|
|
* 32-bit wide and context switch must take care
|
|
* of NEFF sign extension.
|
|
*/
|
|
if (user_mode(regs)) {
|
|
childregs->regs[15] = neff_sign_extend(usp);
|
|
p->thread.uregs = childregs;
|
|
} else {
|
|
childregs->regs[15] =
|
|
neff_sign_extend((unsigned long)task_stack_page(p) +
|
|
THREAD_SIZE);
|
|
}
|
|
|
|
childregs->regs[9] = 0; /* Set return value for child */
|
|
childregs->sr |= SR_FD; /* Invalidate FPU flag */
|
|
|
|
p->thread.sp = (unsigned long) childregs;
|
|
p->thread.pc = (unsigned long) ret_from_fork;
|
|
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
|
|
unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs *pregs)
|
|
{
|
|
return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
|
|
}
|
|
|
|
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs *pregs)
|
|
{
|
|
if (!newsp)
|
|
newsp = pregs->regs[15];
|
|
return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
|
|
}
|
|
|
|
/*
|
|
* This is trivial, and on the face of it looks like it
|
|
* could equally well be done in user mode.
|
|
*
|
|
* Not so, for quite unobvious reasons - register pressure.
|
|
* In user mode vfork() cannot have a stack frame, and if
|
|
* done by calling the "clone()" system call directly, you
|
|
* do not have enough call-clobbered registers to hold all
|
|
* the information you need.
|
|
*/
|
|
asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
|
|
unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs *pregs)
|
|
{
|
|
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
|
|
}
|
|
|
|
/*
|
|
* sys_execve() executes a new program.
|
|
*/
|
|
asmlinkage int sys_execve(char *ufilename, char **uargv,
|
|
char **uenvp, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs *pregs)
|
|
{
|
|
int error;
|
|
char *filename;
|
|
|
|
filename = getname((char __user *)ufilename);
|
|
error = PTR_ERR(filename);
|
|
if (IS_ERR(filename))
|
|
goto out;
|
|
|
|
error = do_execve(filename,
|
|
(char __user * __user *)uargv,
|
|
(char __user * __user *)uenvp,
|
|
pregs);
|
|
putname(filename);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* These bracket the sleeping functions..
|
|
*/
|
|
extern void interruptible_sleep_on(wait_queue_head_t *q);
|
|
|
|
#define mid_sched ((unsigned long) interruptible_sleep_on)
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
static int in_sh64_switch_to(unsigned long pc)
|
|
{
|
|
extern char __sh64_switch_to_end;
|
|
/* For a sleeping task, the PC is somewhere in the middle of the function,
|
|
so we don't have to worry about masking the LSB off */
|
|
return (pc >= (unsigned long) sh64_switch_to) &&
|
|
(pc < (unsigned long) &__sh64_switch_to_end);
|
|
}
|
|
#endif
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
unsigned long pc;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
return 0;
|
|
|
|
/*
|
|
* The same comment as on the Alpha applies here, too ...
|
|
*/
|
|
pc = thread_saved_pc(p);
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
if (in_sh64_switch_to(pc)) {
|
|
unsigned long schedule_fp;
|
|
unsigned long sh64_switch_to_fp;
|
|
unsigned long schedule_caller_pc;
|
|
|
|
sh64_switch_to_fp = (long) p->thread.sp;
|
|
/* r14 is saved at offset 4 in the sh64_switch_to frame */
|
|
schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
|
|
|
|
/* and the caller of 'schedule' is (currently!) saved at offset 24
|
|
in the frame of schedule (from disasm) */
|
|
schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
|
|
return schedule_caller_pc;
|
|
}
|
|
#endif
|
|
return pc;
|
|
}
|