// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
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*/
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#include <common.h>
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#include <stacktrace.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct stackframe {
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uint64_t fp;
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uint64_t sp;
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uint64_t pc;
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};
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static __always_inline uint64_t read_fp(void)
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{
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uint64_t val;
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asm volatile ("mov %0, x29" : "=r" (val));
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return val;
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}
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static __always_inline uint64_t read_lr(void)
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{
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uint64_t val;
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asm volatile ("mov %0, x30" : "=r" (val));
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return val;
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}
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static __always_inline uint64_t read_pc(void)
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{
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uint64_t val;
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asm volatile ("adr %0, ." : "=r" (val));
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return val;
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}
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/* It's not allowed to access sp_el2 in EL2, so always return a valid sp */
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static __always_inline uint64_t read_sp(void)
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{
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return gd->start_addr_sp - (CONFIG_SYS_STACK_SIZE / 2);
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}
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static bool walk_stackframe(struct stackframe *frame)
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{
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ulong fp = frame->fp;
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if (fp > gd->start_addr_sp ||
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fp < gd->start_addr_sp - CONFIG_SYS_STACK_SIZE)
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return false;
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frame->sp = fp + 0x10;
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frame->fp = *(ulong *)(fp);
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frame->pc = *(ulong *)(fp + 8);
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return true;
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}
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void dump_core_stack(struct pt_regs *regs)
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{
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struct stackframe frame;
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ulong pc, lr;
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#if defined(CONFIG_TPL_BUILD)
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char *build = "tpl";
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#elif defined(CONFIG_SPL_BUILD)
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char *build = "spl";
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#else
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char *build = "";
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#endif
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frame.fp = regs->regs[29];
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frame.sp = regs->sp;
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frame.pc = regs->elr;
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if (gd->flags & GD_FLG_RELOC) {
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pc = (ulong)frame.pc - gd->reloc_off;
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lr = (ulong)regs->regs[30] - gd->reloc_off;
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} else {
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pc = (ulong)frame.pc;
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lr = (ulong)regs->regs[30];
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}
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printf("\nCall trace:\n");
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printf(" PC: [< %08lx >]\n", pc);
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printf(" LR: [< %08lx >]\n", lr);
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printf("\nStack:\n");
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do {
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if (gd->flags & GD_FLG_RELOC)
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pc = (ulong)frame.pc - gd->reloc_off;
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else
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pc = (ulong)frame.pc;
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printf(" [< %08lx >]\n", pc);
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} while (walk_stackframe(&frame));
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printf("\nCopy info from \"Call trace...\" to a file(eg. dump.txt), and run\n"
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"command in your U-Boot project: "
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"./scripts/stacktrace.sh dump.txt %s\n\n", build);
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}
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void dump_stack(void)
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{
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struct pt_regs regs;
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regs.regs[29] = read_fp();
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regs.regs[30] = read_lr();
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regs.sp = read_sp();
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regs.elr = read_pc();
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dump_core_stack(®s);
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}
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