1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle
4 * Copyright (C) 1995, 1996 Paul M. Antoine
5 * Copyright (C) 1998 Ulf Carlsson
6 * Copyright (C) 1999 Silicon Graphics, Inc.
7 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
8 * Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki
9 * Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved.
10 * Copyright (C) 2014, Imagination Technologies Ltd.
11 */
12
13 #include <common.h>
14 #include <asm/mipsregs.h>
15 #include <asm/addrspace.h>
16 #include <asm/system.h>
17
18 DECLARE_GLOBAL_DATA_PTR;
19
show_regs(const struct pt_regs * regs)20 static void show_regs(const struct pt_regs *regs)
21 {
22 const int field = 2 * sizeof(unsigned long);
23 unsigned int cause = regs->cp0_cause;
24 unsigned int exccode;
25 int i;
26
27 /*
28 * Saved main processor registers
29 */
30 for (i = 0; i < 32; ) {
31 if ((i % 4) == 0)
32 printf("$%2d :", i);
33 if (i == 0)
34 printf(" %0*lx", field, 0UL);
35 else if (i == 26 || i == 27)
36 printf(" %*s", field, "");
37 else
38 printf(" %0*lx", field, regs->regs[i]);
39
40 i++;
41 if ((i % 4) == 0)
42 puts("\n");
43 }
44
45 printf("Hi : %0*lx\n", field, regs->hi);
46 printf("Lo : %0*lx\n", field, regs->lo);
47
48 /*
49 * Saved cp0 registers
50 */
51 printf("epc : %0*lx (text %0*lx)\n", field, regs->cp0_epc,
52 field, regs->cp0_epc - gd->reloc_off);
53 printf("ra : %0*lx (text %0*lx)\n", field, regs->regs[31],
54 field, regs->regs[31] - gd->reloc_off);
55
56 printf("Status: %08x\n", (uint32_t) regs->cp0_status);
57
58 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
59 printf("Cause : %08x (ExcCode %02x)\n", cause, exccode);
60
61 if (1 <= exccode && exccode <= 5)
62 printf("BadVA : %0*lx\n", field, regs->cp0_badvaddr);
63
64 printf("PrId : %08x\n", read_c0_prid());
65 }
66
do_reserved(const struct pt_regs * regs)67 void do_reserved(const struct pt_regs *regs)
68 {
69 puts("\nOoops:\n");
70 show_regs(regs);
71 hang();
72 }
73
do_ejtag_debug(const struct pt_regs * regs)74 void do_ejtag_debug(const struct pt_regs *regs)
75 {
76 const int field = 2 * sizeof(unsigned long);
77 unsigned long depc;
78 unsigned int debug;
79
80 depc = read_c0_depc();
81 debug = read_c0_debug();
82
83 printf("SDBBP EJTAG debug exception: c0_depc = %0*lx, DEBUG = %08x\n",
84 field, depc, debug);
85 }
86
set_handler(unsigned long offset,void * addr,unsigned long size)87 static void set_handler(unsigned long offset, void *addr, unsigned long size)
88 {
89 unsigned long ebase = gd->irq_sp;
90
91 memcpy((void *)(ebase + offset), addr, size);
92 flush_cache(ebase + offset, size);
93 }
94
trap_init(ulong reloc_addr)95 void trap_init(ulong reloc_addr)
96 {
97 unsigned long ebase = gd->irq_sp;
98
99 set_handler(0x180, &except_vec3_generic, 0x80);
100 set_handler(0x280, &except_vec_ejtag_debug, 0x80);
101
102 write_c0_ebase(ebase);
103 clear_c0_status(ST0_BEV);
104 execution_hazard_barrier();
105 }
106