2011-01-15 11:16:21 +01:00
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/*
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* linux/arch/unicore32/kernel/process.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stdarg.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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2017-02-08 18:51:35 +01:00
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#include <linux/sched/debug.h>
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2017-02-08 18:51:36 +01:00
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#include <linux/sched/task.h>
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2017-02-08 18:51:37 +01:00
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#include <linux/sched/task_stack.h>
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2011-01-15 11:16:21 +01:00
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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/unistd.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/elfcore.h>
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#include <linux/pm.h>
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#include <linux/tick.h>
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#include <linux/utsname.h>
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#include <linux/uaccess.h>
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#include <linux/random.h>
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#include <linux/gpio.h>
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#include <linux/stacktrace.h>
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#include <asm/cacheflush.h>
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#include <asm/processor.h>
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#include <asm/stacktrace.h>
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#include "setup.h"
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static const char * const processor_modes[] = {
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"UK00", "UK01", "UK02", "UK03", "UK04", "UK05", "UK06", "UK07",
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"UK08", "UK09", "UK0A", "UK0B", "UK0C", "UK0D", "UK0E", "UK0F",
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"USER", "REAL", "INTR", "PRIV", "UK14", "UK15", "UK16", "ABRT",
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"UK18", "UK19", "UK1A", "EXTN", "UK1C", "UK1D", "UK1E", "SUSR"
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};
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2013-03-21 22:50:02 +01:00
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void arch_cpu_idle(void)
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2011-01-15 11:16:21 +01:00
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{
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2013-03-21 22:50:02 +01:00
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cpu_do_idle();
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local_irq_enable();
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2011-01-15 11:16:21 +01:00
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}
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void machine_halt(void)
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{
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gpio_set_value(GPO_SOFT_OFF, 0);
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}
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/*
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* Function pointers to optional machine specific functions
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*/
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void (*pm_power_off)(void) = NULL;
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2014-05-27 02:04:24 +02:00
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EXPORT_SYMBOL(pm_power_off);
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2011-01-15 11:16:21 +01:00
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void machine_power_off(void)
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{
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if (pm_power_off)
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pm_power_off();
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machine_halt();
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}
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void machine_restart(char *cmd)
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{
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/* Disable interrupts first */
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local_irq_disable();
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/*
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* Tell the mm system that we are going to reboot -
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* we may need it to insert some 1:1 mappings so that
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* soft boot works.
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*/
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2013-07-09 01:01:36 +02:00
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setup_mm_for_reboot();
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2011-01-15 11:16:21 +01:00
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/* Clean and invalidate caches */
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flush_cache_all();
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/* Turn off caching */
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cpu_proc_fin();
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/* Push out any further dirty data, and ensure cache is empty */
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flush_cache_all();
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/*
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* Now handle reboot code.
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*/
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2013-07-09 01:01:36 +02:00
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if (reboot_mode == REBOOT_SOFT) {
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2011-01-15 11:16:21 +01:00
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/* Jump into ROM at address 0xffff0000 */
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cpu_reset(VECTORS_BASE);
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} else {
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2011-02-26 14:21:18 +01:00
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writel(0x00002001, PM_PLLSYSCFG); /* cpu clk = 250M */
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writel(0x00100800, PM_PLLDDRCFG); /* ddr clk = 44M */
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writel(0x00002001, PM_PLLVGACFG); /* vga clk = 250M */
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2011-01-15 11:16:21 +01:00
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/* Use on-chip reset capability */
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/* following instructions must be in one icache line */
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__asm__ __volatile__(
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" .align 5\n\t"
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" stw %1, [%0]\n\t"
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"201: ldw r0, [%0]\n\t"
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" cmpsub.a r0, #0\n\t"
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" bne 201b\n\t"
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" stw %3, [%2]\n\t"
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" nop; nop; nop\n\t"
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/* prefetch 3 instructions at most */
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:
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2011-02-26 14:21:18 +01:00
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: "r" (PM_PMCR),
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2011-01-15 11:16:21 +01:00
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"r" (PM_PMCR_CFBSYS | PM_PMCR_CFBDDR
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| PM_PMCR_CFBVGA),
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2011-02-26 14:21:18 +01:00
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"r" (RESETC_SWRR),
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2011-01-15 11:16:21 +01:00
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"r" (RESETC_SWRR_SRB)
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: "r0", "memory");
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}
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/*
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* Whoops - the architecture was unable to reboot.
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* Tell the user!
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*/
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mdelay(1000);
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printk(KERN_EMERG "Reboot failed -- System halted\n");
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do { } while (1);
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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 flags;
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char buf[64];
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dump_stack: unify debug information printed by show_regs()
show_regs() is inherently arch-dependent but it does make sense to print
generic debug information and some archs already do albeit in slightly
different forms. This patch introduces a generic function to print debug
information from show_regs() so that different archs print out the same
information and it's much easier to modify what's printed.
show_regs_print_info() prints out the same debug info as dump_stack()
does plus task and thread_info pointers.
* Archs which didn't print debug info now do.
alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r,
metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc,
um, xtensa
* Already prints debug info. Replaced with show_regs_print_info().
The printed information is superset of what used to be there.
arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86
* s390 is special in that it used to print arch-specific information
along with generic debug info. Heiko and Martin think that the
arch-specific extra isn't worth keeping s390 specfic implementation.
Converted to use the generic version.
Note that now all archs print the debug info before actual register
dumps.
An example BUG() dump follows.
kernel BUG at /work/os/work/kernel/workqueue.c:4841!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7
Hardware name: empty empty/S3992, BIOS 080011 10/26/2007
task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000
RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6
RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246
RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001
RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a
RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650
0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d
ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760
Call Trace:
[<ffffffff81000312>] do_one_initcall+0x122/0x170
[<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8
[<ffffffff81c47760>] ? rest_init+0x140/0x140
[<ffffffff81c4776e>] kernel_init+0xe/0xf0
[<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0
[<ffffffff81c47760>] ? rest_init+0x140/0x140
...
v2: Typo fix in x86-32.
v3: CPU number dropped from show_regs_print_info() as
dump_stack_print_info() has been updated to print it. s390
specific implementation dropped as requested by s390 maintainers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-01 00:27:17 +02:00
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show_regs_print_info(KERN_DEFAULT);
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2017-12-11 13:50:19 +01:00
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printk("PC is at %pS\n", (void *)instruction_pointer(regs));
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printk("LR is at %pS\n", (void *)regs->UCreg_lr);
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2011-01-15 11:16:21 +01:00
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printk(KERN_DEFAULT "pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
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"sp : %08lx ip : %08lx fp : %08lx\n",
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regs->UCreg_pc, regs->UCreg_lr, regs->UCreg_asr,
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regs->UCreg_sp, regs->UCreg_ip, regs->UCreg_fp);
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printk(KERN_DEFAULT "r26: %08lx r25: %08lx r24: %08lx\n",
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regs->UCreg_26, regs->UCreg_25,
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regs->UCreg_24);
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printk(KERN_DEFAULT "r23: %08lx r22: %08lx r21: %08lx r20: %08lx\n",
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regs->UCreg_23, regs->UCreg_22,
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regs->UCreg_21, regs->UCreg_20);
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printk(KERN_DEFAULT "r19: %08lx r18: %08lx r17: %08lx r16: %08lx\n",
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regs->UCreg_19, regs->UCreg_18,
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regs->UCreg_17, regs->UCreg_16);
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printk(KERN_DEFAULT "r15: %08lx r14: %08lx r13: %08lx r12: %08lx\n",
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regs->UCreg_15, regs->UCreg_14,
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regs->UCreg_13, regs->UCreg_12);
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printk(KERN_DEFAULT "r11: %08lx r10: %08lx r9 : %08lx r8 : %08lx\n",
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regs->UCreg_11, regs->UCreg_10,
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regs->UCreg_09, regs->UCreg_08);
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printk(KERN_DEFAULT "r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
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regs->UCreg_07, regs->UCreg_06,
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regs->UCreg_05, regs->UCreg_04);
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printk(KERN_DEFAULT "r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
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regs->UCreg_03, regs->UCreg_02,
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regs->UCreg_01, regs->UCreg_00);
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flags = regs->UCreg_asr;
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buf[0] = flags & PSR_S_BIT ? 'S' : 's';
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buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
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buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
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buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
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buf[4] = '\0';
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printk(KERN_DEFAULT "Flags: %s INTR o%s REAL o%s Mode %s Segment %s\n",
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buf, interrupts_enabled(regs) ? "n" : "ff",
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fast_interrupts_enabled(regs) ? "n" : "ff",
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processor_modes[processor_mode(regs)],
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2017-03-21 02:08:07 +01:00
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uaccess_kernel() ? "kernel" : "user");
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2011-01-15 11:16:21 +01:00
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{
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unsigned int ctrl;
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buf[0] = '\0';
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{
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unsigned int transbase;
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asm("movc %0, p0.c2, #0\n"
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: "=r" (transbase));
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snprintf(buf, sizeof(buf), " Table: %08x", transbase);
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}
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asm("movc %0, p0.c1, #0\n" : "=r" (ctrl));
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printk(KERN_DEFAULT "Control: %08x%s\n", ctrl, buf);
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}
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}
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void show_regs(struct pt_regs *regs)
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{
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printk(KERN_DEFAULT "\n");
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printk(KERN_DEFAULT "Pid: %d, comm: %20s\n",
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task_pid_nr(current), current->comm);
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__show_regs(regs);
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__backtrace();
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}
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void flush_thread(void)
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{
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struct thread_info *thread = current_thread_info();
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struct task_struct *tsk = current;
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memset(thread->used_cp, 0, sizeof(thread->used_cp));
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memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
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#ifdef CONFIG_UNICORE_FPU_F64
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memset(&thread->fpstate, 0, sizeof(struct fp_state));
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#endif
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}
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void release_thread(struct task_struct *dead_task)
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{
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}
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asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
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2012-10-13 23:35:21 +02:00
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asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
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2011-01-15 11:16:21 +01:00
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int
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copy_thread(unsigned long clone_flags, unsigned long stack_start,
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2012-10-23 04:51:14 +02:00
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unsigned long stk_sz, struct task_struct *p)
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2011-01-15 11:16:21 +01:00
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{
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struct thread_info *thread = task_thread_info(p);
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struct pt_regs *childregs = task_pt_regs(p);
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memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
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thread->cpu_context.sp = (unsigned long)childregs;
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2012-10-23 04:49:03 +02:00
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if (unlikely(p->flags & PF_KTHREAD)) {
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2012-10-13 23:35:21 +02:00
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thread->cpu_context.pc = (unsigned long)ret_from_kernel_thread;
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thread->cpu_context.r4 = stack_start;
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thread->cpu_context.r5 = stk_sz;
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memset(childregs, 0, sizeof(struct pt_regs));
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} else {
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thread->cpu_context.pc = (unsigned long)ret_from_fork;
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2012-10-23 04:49:03 +02:00
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*childregs = *current_pt_regs();
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2012-10-13 23:35:21 +02:00
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childregs->UCreg_00 = 0;
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2012-10-23 04:49:03 +02:00
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if (stack_start)
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childregs->UCreg_sp = stack_start;
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2011-01-15 11:16:21 +01:00
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2012-10-13 23:35:21 +02:00
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if (clone_flags & CLONE_SETTLS)
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2012-10-23 04:49:03 +02:00
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childregs->UCreg_16 = childregs->UCreg_03;
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2012-10-13 23:35:21 +02:00
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}
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2011-01-15 11:16:21 +01:00
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return 0;
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}
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/*
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* Fill in the task's elfregs structure for a core dump.
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*/
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int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
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{
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elf_core_copy_regs(elfregs, task_pt_regs(t));
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return 1;
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}
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/*
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* fill in the fpe structure for a core dump...
|
|
|
|
*/
|
|
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fp)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = current_thread_info();
|
|
|
|
int used_math = thread->used_cp[1] | thread->used_cp[2];
|
|
|
|
|
|
|
|
#ifdef CONFIG_UNICORE_FPU_F64
|
|
|
|
if (used_math)
|
|
|
|
memcpy(fp, &thread->fpstate, sizeof(*fp));
|
|
|
|
#endif
|
|
|
|
return used_math != 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(dump_fpu);
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
|
|
|
struct stackframe frame;
|
|
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
frame.fp = thread_saved_fp(p);
|
|
|
|
frame.sp = thread_saved_sp(p);
|
|
|
|
frame.lr = 0; /* recovered from the stack */
|
|
|
|
frame.pc = thread_saved_pc(p);
|
|
|
|
do {
|
|
|
|
int ret = unwind_frame(&frame);
|
|
|
|
if (ret < 0)
|
|
|
|
return 0;
|
|
|
|
if (!in_sched_functions(frame.pc))
|
|
|
|
return frame.pc;
|
|
|
|
} while ((count++) < 16);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long arch_randomize_brk(struct mm_struct *mm)
|
|
|
|
{
|
2016-10-11 22:54:08 +02:00
|
|
|
return randomize_page(mm->brk, 0x02000000);
|
2011-01-15 11:16:21 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The vectors page is always readable from user space for the
|
|
|
|
* atomic helpers and the signal restart code. Let's declare a mapping
|
|
|
|
* for it so it is visible through ptrace and /proc/<pid>/mem.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int vectors_user_mapping(void)
|
|
|
|
{
|
|
|
|
struct mm_struct *mm = current->mm;
|
|
|
|
return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
|
|
|
|
VM_READ | VM_EXEC |
|
|
|
|
VM_MAYREAD | VM_MAYEXEC |
|
mm: kill vma flag VM_RESERVED and mm->reserved_vm counter
A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA,
currently it lost original meaning but still has some effects:
| effect | alternative flags
-+------------------------+---------------------------------------------
1| account as reserved_vm | VM_IO
2| skip in core dump | VM_IO, VM_DONTDUMP
3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
4| do not mlock | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
This patch removes reserved_vm counter from mm_struct. Seems like nobody
cares about it, it does not exported into userspace directly, it only
reduces total_vm showed in proc.
Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP.
remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP.
remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP.
[akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 01:29:02 +02:00
|
|
|
VM_DONTEXPAND | VM_DONTDUMP,
|
2011-01-15 11:16:21 +01:00
|
|
|
NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
const char *arch_vma_name(struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
|
|
|
|
}
|