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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle
* Copyright (C) 1995, 1996 Paul M. Antoine
* Copyright (C) 1998 Ulf Carlsson
* Copyright (C) 1999 Silicon Graphics, Inc.
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki
* Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2014, Imagination Technologies Ltd.
*/
#include <common.h>
#include <cpu_func.h>
#include <hang.h>
#include <init.h>
#include <log.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/system.h>
DECLARE_GLOBAL_DATA_PTR;
static unsigned long saved_ebase;
static void show_regs(const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
unsigned int cause = regs->cp0_cause;
unsigned int exccode;
int i;
/*
* Saved main processor registers
*/
for (i = 0; i < 32; ) {
if ((i % 4) == 0)
printf("$%2d :", i);
if (i == 0)
printf(" %0*lx", field, 0UL);
else if (i == 26 || i == 27)
printf(" %*s", field, "");
else
printf(" %0*lx", field, regs->regs[i]);
i++;
if ((i % 4) == 0)
puts("\n");
}
printf("Hi : %0*lx\n", field, regs->hi);
printf("Lo : %0*lx\n", field, regs->lo);
/*
* Saved cp0 registers
*/
printf("epc : %0*lx (text %0*lx)\n", field, regs->cp0_epc,
field, regs->cp0_epc - gd->reloc_off);
printf("ra : %0*lx (text %0*lx)\n", field, regs->regs[31],
field, regs->regs[31] - gd->reloc_off);
printf("Status: %08x\n", (uint32_t) regs->cp0_status);
exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
printf("Cause : %08x (ExcCode %02x)\n", cause, exccode);
if (1 <= exccode && exccode <= 5)
printf("BadVA : %0*lx\n", field, regs->cp0_badvaddr);
printf("PrId : %08x\n", read_c0_prid());
}
void do_reserved(const struct pt_regs *regs)
{
puts("\nOoops:\n");
show_regs(regs);
hang();
}
void do_ejtag_debug(const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
unsigned long depc;
unsigned int debug;
depc = read_c0_depc();
debug = read_c0_debug();
printf("SDBBP EJTAG debug exception: c0_depc = %0*lx, DEBUG = %08x\n",
field, depc, debug);
}
static void set_handler(unsigned long offset, void *addr, unsigned long size)
{
unsigned long ebase = gd->irq_sp;
memcpy((void *)(ebase + offset), addr, size);
flush_cache(ebase + offset, size);
}
void trap_init(ulong reloc_addr)
{
unsigned long ebase = gd->irq_sp;
set_handler(0x180, &except_vec3_generic, 0x80);
set_handler(0x280, &except_vec_ejtag_debug, 0x80);
saved_ebase = read_c0_ebase() & 0xfffff000;
write_c0_ebase(ebase);
clear_c0_status(ST0_BEV);
execution_hazard_barrier();
}
void trap_restore(void)
{
set_c0_status(ST0_BEV);
execution_hazard_barrier();
#ifdef CONFIG_OVERRIDE_EXCEPTION_VECTOR_BASE
write_c0_ebase(CONFIG_NEW_EXCEPTION_VECTOR_BASE & 0xfffff000);
#else
write_c0_ebase(saved_ebase);
#endif
clear_c0_status(ST0_BEV);
execution_hazard_barrier();
}
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