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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2003
* Texas Instruments <www.ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002-2004
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* (C) Copyright 2004
* Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
*/
#include <cpu_func.h>
#include <efi_loader.h>
#include <irq_func.h>
#include <semihosting.h>
#include <asm/global_data.h>
#include <asm/proc-armv/ptrace.h>
#include <asm/ptrace.h>
#include <asm/u-boot-arm.h>
DECLARE_GLOBAL_DATA_PTR;
int interrupt_init(void)
{
/*
* setup up stacks if necessary
*/
IRQ_STACK_START_IN = gd->irq_sp + 8;
enable_interrupts();
return 0;
}
void enable_interrupts(void)
{
return;
}
int disable_interrupts(void)
{
return 0;
}
void bad_mode (void)
{
panic ("Resetting CPU ...\n");
reset_cpu();
}
static void show_efi_loaded_images(struct pt_regs *regs)
{
efi_print_image_infos((void *)instruction_pointer(regs));
}
static void dump_instr(struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
const int thumb = thumb_mode(regs);
const int width = thumb ? 4 : 8;
int i;
if (thumb)
addr &= ~1L;
else
addr &= ~3L;
printf("Code: ");
for (i = -4; i < 1 + !!thumb; i++) {
unsigned int val;
if (thumb)
val = ((u16 *)addr)[i];
else
val = ((u32 *)addr)[i];
printf(i == 0 ? "(%0*x) " : "%0*x ", width, val);
}
printf("\n");
}
void show_regs (struct pt_regs *regs)
{
unsigned long __maybe_unused flags;
const char __maybe_unused *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
"UK4_26", "UK5_26", "UK6_26", "UK7_26",
"UK8_26", "UK9_26", "UK10_26", "UK11_26",
"UK12_26", "UK13_26", "UK14_26", "UK15_26",
"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
"UK4_32", "UK5_32", "UK6_32", "ABT_32",
"UK8_32", "UK9_32", "HYP_32", "UND_32",
"UK12_32", "UK13_32", "UK14_32", "SYS_32",
};
flags = condition_codes (regs);
printf("pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs), regs->ARM_lr);
if (gd->flags & GD_FLG_RELOC) {
printf("reloc pc : [<%08lx>] lr : [<%08lx>]\n",
instruction_pointer(regs) - gd->reloc_off,
regs->ARM_lr - gd->reloc_off);
}
printf("sp : %08lx ip : %08lx fp : %08lx\n",
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
printf ("Flags: %c%c%c%c",
flags & CC_N_BIT ? 'N' : 'n',
flags & CC_Z_BIT ? 'Z' : 'z',
flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
printf (" IRQs %s FIQs %s Mode %s%s\n",
interrupts_enabled (regs) ? "on" : "off",
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
dump_instr(regs);
}
/* fixup PC to point to the instruction leading to the exception */
static inline void fixup_pc(struct pt_regs *regs, int offset)
{
uint32_t pc = instruction_pointer(regs) + offset;
regs->ARM_pc = pc | (regs->ARM_pc & PCMASK);
}
/*
* Try to "emulate" a semihosting call in the event that we don't have a
* debugger attached.
*/
static bool smh_emulate_trap(struct pt_regs *regs)
{
if (regs->ARM_cpsr & T_BIT) {
u16 *insn = (u16 *)(regs->ARM_pc - 2);
if (*insn != SMH_T32_SVC)
return false;
} else {
u32 *insn = (u32 *)(regs->ARM_pc - 4);
if (*insn != SMH_A32_SVC)
return false;
}
/* Avoid future semihosting calls */
disable_semihosting();
/* Just pretend the call failed */
regs->ARM_r0 = -1;
return true;
}
void do_undefined_instruction (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("undefined instruction\n");
fixup_pc(pt_regs, -4);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_software_interrupt (struct pt_regs *pt_regs)
{
if (CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK) &&
smh_emulate_trap(pt_regs))
return;
efi_restore_gd();
printf ("software interrupt\n");
fixup_pc(pt_regs, -4);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_prefetch_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("prefetch abort\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_data_abort (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("data abort\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_not_used (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("not used\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_fiq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("fast interrupt request\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
void do_irq (struct pt_regs *pt_regs)
{
efi_restore_gd();
printf ("interrupt request\n");
fixup_pc(pt_regs, -8);
show_regs (pt_regs);
show_efi_loaded_images(pt_regs);
bad_mode ();
}
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