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