134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle
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* Copyright (C) 1995, 1996 Paul M. Antoine
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* Copyright (C) 1998 Ulf Carlsson
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki
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* Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2014, Imagination Technologies Ltd.
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*/
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#include <common.h>
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#include <asm/ptrace.h>
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#include <cpu_func.h>
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#include <hang.h>
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#include <init.h>
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#include <log.h>
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#include <asm/mipsregs.h>
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#include <asm/addrspace.h>
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#include <asm/system.h>
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DECLARE_GLOBAL_DATA_PTR;
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static unsigned long saved_ebase;
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static void show_regs(const struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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unsigned int cause = regs->cp0_cause;
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unsigned int exccode;
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int i;
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/*
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* Saved main processor registers
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*/
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for (i = 0; i < 32; ) {
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if ((i % 4) == 0)
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printf("$%2d :", i);
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if (i == 0)
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printf(" %0*lx", field, 0UL);
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else if (i == 26 || i == 27)
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printf(" %*s", field, "");
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else
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printf(" %0*lx", field, regs->regs[i]);
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i++;
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if ((i % 4) == 0)
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puts("\n");
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}
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printf("Hi : %0*lx\n", field, regs->hi);
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printf("Lo : %0*lx\n", field, regs->lo);
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/*
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* Saved cp0 registers
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*/
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printf("epc : %0*lx (text %0*lx)\n", field, regs->cp0_epc,
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field, regs->cp0_epc - gd->reloc_off);
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printf("ra : %0*lx (text %0*lx)\n", field, regs->regs[31],
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field, regs->regs[31] - gd->reloc_off);
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printf("Status: %08x\n", (uint32_t) regs->cp0_status);
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exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
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printf("Cause : %08x (ExcCode %02x)\n", cause, exccode);
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if (1 <= exccode && exccode <= 5)
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printf("BadVA : %0*lx\n", field, regs->cp0_badvaddr);
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printf("PrId : %08x\n", read_c0_prid());
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}
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void do_reserved(const struct pt_regs *regs)
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{
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puts("\nOoops:\n");
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show_regs(regs);
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hang();
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}
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void do_ejtag_debug(const struct pt_regs *regs)
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{
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const int field = 2 * sizeof(unsigned long);
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unsigned long depc;
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unsigned int debug;
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depc = read_c0_depc();
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debug = read_c0_debug();
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printf("SDBBP EJTAG debug exception: c0_depc = %0*lx, DEBUG = %08x\n",
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field, depc, debug);
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}
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static void set_handler(unsigned long offset, void *addr, unsigned long size)
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{
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unsigned long ebase = gd->irq_sp;
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memcpy((void *)(ebase + offset), addr, size);
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flush_cache(ebase + offset, size);
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}
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void trap_init(ulong reloc_addr)
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{
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unsigned long ebase = gd->irq_sp;
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set_handler(0x180, &except_vec3_generic, 0x80);
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set_handler(0x280, &except_vec_ejtag_debug, 0x80);
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saved_ebase = read_c0_ebase() & 0xfffff000;
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/* Set WG bit on Octeon to enable writing to bits 63:30 */
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if (IS_ENABLED(CONFIG_ARCH_OCTEON))
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ebase |= MIPS_EBASE_WG;
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write_c0_ebase(ebase);
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clear_c0_status(ST0_BEV);
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execution_hazard_barrier();
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}
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void trap_restore(void)
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{
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set_c0_status(ST0_BEV);
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execution_hazard_barrier();
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#ifdef CONFIG_OVERRIDE_EXCEPTION_VECTOR_BASE
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write_c0_ebase(CONFIG_NEW_EXCEPTION_VECTOR_BASE & 0xfffff000);
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#else
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write_c0_ebase(saved_ebase);
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#endif
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clear_c0_status(ST0_BEV);
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execution_hazard_barrier();
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}
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