8b83369ddc
Pull RISC-V updates from Palmer Dabbelt:
"A handful of new RISC-V related patches for this merge window:
- A check to ensure drivers are properly using uaccess. This isn't
manifesting with any of the drivers I'm currently using, but may
catch errors in new drivers.
- Some preliminary support for the FU740, along with the HiFive
Unleashed it will appear on.
- NUMA support for RISC-V, which involves making the arm64 code
generic.
- Support for kasan on the vmalloc region.
- A handful of new drivers for the Kendryte K210, along with the DT
plumbing required to boot on a handful of K210-based boards.
- Support for allocating ASIDs.
- Preliminary support for kernels larger than 128MiB.
- Various other improvements to our KASAN support, including the
utilization of huge pages when allocating the KASAN regions.
We may have already found a bug with the KASAN_VMALLOC code, but it's
passing my tests. There's a fix in the works, but that will probably
miss the merge window.
* tag 'riscv-for-linus-5.12-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (75 commits)
riscv: Improve kasan population by using hugepages when possible
riscv: Improve kasan population function
riscv: Use KASAN_SHADOW_INIT define for kasan memory initialization
riscv: Improve kasan definitions
riscv: Get rid of MAX_EARLY_MAPPING_SIZE
soc: canaan: Sort the Makefile alphabetically
riscv: Disable KSAN_SANITIZE for vDSO
riscv: Remove unnecessary declaration
riscv: Add Canaan Kendryte K210 SD card defconfig
riscv: Update Canaan Kendryte K210 defconfig
riscv: Add Kendryte KD233 board device tree
riscv: Add SiPeed MAIXDUINO board device tree
riscv: Add SiPeed MAIX GO board device tree
riscv: Add SiPeed MAIX DOCK board device tree
riscv: Add SiPeed MAIX BiT board device tree
riscv: Update Canaan Kendryte K210 device tree
dt-bindings: add resets property to dw-apb-timer
dt-bindings: fix sifive gpio properties
dt-bindings: update sifive uart compatible string
dt-bindings: update sifive clint compatible string
...
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2008 ARM Limited
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* Copyright (C) 2014 Regents of the University of California
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*/
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#include <linux/export.h>
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#include <linux/kallsyms.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_stack.h>
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#include <linux/stacktrace.h>
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#include <linux/ftrace.h>
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#include <asm/stacktrace.h>
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register const unsigned long sp_in_global __asm__("sp");
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#ifdef CONFIG_FRAME_POINTER
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void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
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bool (*fn)(void *, unsigned long), void *arg)
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{
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unsigned long fp, sp, pc;
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if (regs) {
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fp = frame_pointer(regs);
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sp = user_stack_pointer(regs);
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pc = instruction_pointer(regs);
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} else if (task == NULL || task == current) {
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fp = (unsigned long)__builtin_frame_address(0);
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sp = sp_in_global;
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pc = (unsigned long)walk_stackframe;
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} else {
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/* task blocked in __switch_to */
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fp = task->thread.s[0];
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sp = task->thread.sp;
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pc = task->thread.ra;
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}
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for (;;) {
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unsigned long low, high;
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struct stackframe *frame;
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if (unlikely(!__kernel_text_address(pc) || !fn(arg, pc)))
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break;
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/* Validate frame pointer */
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low = sp + sizeof(struct stackframe);
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high = ALIGN(sp, THREAD_SIZE);
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if (unlikely(fp < low || fp > high || fp & 0x7))
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break;
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/* Unwind stack frame */
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frame = (struct stackframe *)fp - 1;
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sp = fp;
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if (regs && (regs->epc == pc) && (frame->fp & 0x7)) {
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fp = frame->ra;
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pc = regs->ra;
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} else {
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fp = frame->fp;
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pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
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(unsigned long *)(fp - 8));
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}
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}
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}
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#else /* !CONFIG_FRAME_POINTER */
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void notrace walk_stackframe(struct task_struct *task,
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struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *arg)
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{
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unsigned long sp, pc;
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unsigned long *ksp;
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if (regs) {
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sp = user_stack_pointer(regs);
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pc = instruction_pointer(regs);
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} else if (task == NULL || task == current) {
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sp = sp_in_global;
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pc = (unsigned long)walk_stackframe;
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} else {
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/* task blocked in __switch_to */
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sp = task->thread.sp;
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pc = task->thread.ra;
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}
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if (unlikely(sp & 0x7))
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return;
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ksp = (unsigned long *)sp;
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while (!kstack_end(ksp)) {
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if (__kernel_text_address(pc) && unlikely(!fn(arg, pc)))
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break;
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pc = (*ksp++) - 0x4;
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}
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}
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#endif /* CONFIG_FRAME_POINTER */
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static bool print_trace_address(void *arg, unsigned long pc)
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{
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const char *loglvl = arg;
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print_ip_sym(loglvl, pc);
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return true;
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}
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void dump_backtrace(struct pt_regs *regs, struct task_struct *task,
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const char *loglvl)
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{
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pr_cont("%sCall Trace:\n", loglvl);
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walk_stackframe(task, regs, print_trace_address, (void *)loglvl);
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}
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void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
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{
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dump_backtrace(NULL, task, loglvl);
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}
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static bool save_wchan(void *arg, unsigned long pc)
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{
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if (!in_sched_functions(pc)) {
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unsigned long *p = arg;
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*p = pc;
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return false;
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}
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return true;
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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 = 0;
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if (likely(task && task != current && task->state != TASK_RUNNING))
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walk_stackframe(task, NULL, save_wchan, &pc);
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return pc;
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}
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#ifdef CONFIG_STACKTRACE
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void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
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struct task_struct *task, struct pt_regs *regs)
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{
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walk_stackframe(task, regs, consume_entry, cookie);
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}
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#endif /* CONFIG_STACKTRACE */
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