1129198Scognet/* $NetBSD: db_interface.c,v 1.33 2003/08/25 04:51:10 mrg Exp $ */ 2129198Scognet 3139735Simp/*- 4129198Scognet * Copyright (c) 1996 Scott K. Stevens 5129198Scognet * 6129198Scognet * Mach Operating System 7129198Scognet * Copyright (c) 1991,1990 Carnegie Mellon University 8129198Scognet * All Rights Reserved. 9236991Simp * 10129198Scognet * Permission to use, copy, modify and distribute this software and its 11129198Scognet * documentation is hereby granted, provided that both the copyright 12129198Scognet * notice and this permission notice appear in all copies of the 13129198Scognet * software, derivative works or modified versions, and any portions 14129198Scognet * thereof, and that both notices appear in supporting documentation. 15236991Simp * 16129198Scognet * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17129198Scognet * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18129198Scognet * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19236991Simp * 20129198Scognet * Carnegie Mellon requests users of this software to return to 21236991Simp * 22129198Scognet * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23129198Scognet * School of Computer Science 24129198Scognet * Carnegie Mellon University 25129198Scognet * Pittsburgh PA 15213-3890 26236991Simp * 27129198Scognet * any improvements or extensions that they make and grant Carnegie the 28129198Scognet * rights to redistribute these changes. 29129198Scognet * 30129198Scognet * From: db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU) 31129198Scognet */ 32129198Scognet 33129198Scognet/* 34129198Scognet * Interface to new debugger. 35129198Scognet */ 36129198Scognet 37129198Scognet#include <sys/cdefs.h> 38129198Scognet__FBSDID("$FreeBSD$"); 39129198Scognet#include "opt_ddb.h" 40129198Scognet 41129198Scognet#include <sys/param.h> 42295319Smmel#include <sys/cons.h> 43129198Scognet#include <sys/proc.h> 44129198Scognet#include <sys/reboot.h> 45129198Scognet#include <sys/systm.h> /* just for boothowto */ 46129198Scognet#include <sys/exec.h> 47137975Scognet#ifdef KDB 48137975Scognet#include <sys/kdb.h> 49137975Scognet#endif 50129198Scognet 51129198Scognet#include <vm/vm.h> 52129198Scognet#include <vm/pmap.h> 53129198Scognet#include <vm/vm_map.h> 54129198Scognet#include <vm/vm_extern.h> 55129198Scognet 56129198Scognet#include <machine/db_machdep.h> 57295319Smmel#include <machine/cpu.h> 58290273Szbb#include <machine/machdep.h> 59129198Scognet#include <machine/vmparam.h> 60129198Scognet 61129198Scognet#include <ddb/ddb.h> 62129198Scognet#include <ddb/db_access.h> 63129198Scognet#include <ddb/db_command.h> 64129198Scognet#include <ddb/db_output.h> 65129198Scognet#include <ddb/db_variables.h> 66129198Scognet#include <ddb/db_sym.h> 67129198Scognet 68295319Smmel 69132059Scognetstatic int nil = 0; 70129198Scognet 71129198Scognetint db_access_und_sp (struct db_variable *, db_expr_t *, int); 72129198Scognetint db_access_abt_sp (struct db_variable *, db_expr_t *, int); 73129198Scognetint db_access_irq_sp (struct db_variable *, db_expr_t *, int); 74129198Scognet 75147543Scognetstatic db_varfcn_t db_frame; 76147543Scognet 77132059Scognet#define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x) 78129198Scognetstruct db_variable db_regs[] = { 79147543Scognet { "spsr", DB_OFFSET(tf_spsr), db_frame }, 80147543Scognet { "r0", DB_OFFSET(tf_r0), db_frame }, 81147543Scognet { "r1", DB_OFFSET(tf_r1), db_frame }, 82147543Scognet { "r2", DB_OFFSET(tf_r2), db_frame }, 83147543Scognet { "r3", DB_OFFSET(tf_r3), db_frame }, 84147543Scognet { "r4", DB_OFFSET(tf_r4), db_frame }, 85147543Scognet { "r5", DB_OFFSET(tf_r5), db_frame }, 86147543Scognet { "r6", DB_OFFSET(tf_r6), db_frame }, 87147543Scognet { "r7", DB_OFFSET(tf_r7), db_frame }, 88147543Scognet { "r8", DB_OFFSET(tf_r8), db_frame }, 89147543Scognet { "r9", DB_OFFSET(tf_r9), db_frame }, 90147543Scognet { "r10", DB_OFFSET(tf_r10), db_frame }, 91147543Scognet { "r11", DB_OFFSET(tf_r11), db_frame }, 92147543Scognet { "r12", DB_OFFSET(tf_r12), db_frame }, 93147543Scognet { "usr_sp", DB_OFFSET(tf_usr_sp), db_frame }, 94147543Scognet { "usr_lr", DB_OFFSET(tf_usr_lr), db_frame }, 95147543Scognet { "svc_sp", DB_OFFSET(tf_svc_sp), db_frame }, 96147543Scognet { "svc_lr", DB_OFFSET(tf_svc_lr), db_frame }, 97147543Scognet { "pc", DB_OFFSET(tf_pc), db_frame }, 98129198Scognet { "und_sp", &nil, db_access_und_sp, }, 99129198Scognet { "abt_sp", &nil, db_access_abt_sp, }, 100129198Scognet { "irq_sp", &nil, db_access_irq_sp, }, 101129198Scognet}; 102129198Scognet 103298352Spfgstruct db_variable *db_eregs = db_regs + nitems(db_regs); 104129198Scognet 105129198Scognetint 106129198Scognetdb_access_und_sp(struct db_variable *vp, db_expr_t *valp, int rw) 107129198Scognet{ 108129198Scognet 109147543Scognet if (rw == DB_VAR_GET) { 110129198Scognet *valp = get_stackptr(PSR_UND32_MODE); 111147543Scognet return (1); 112147543Scognet } 113166695Skevlo return (0); 114129198Scognet} 115129198Scognet 116129198Scognetint 117129198Scognetdb_access_abt_sp(struct db_variable *vp, db_expr_t *valp, int rw) 118129198Scognet{ 119129198Scognet 120147543Scognet if (rw == DB_VAR_GET) { 121129198Scognet *valp = get_stackptr(PSR_ABT32_MODE); 122147543Scognet return (1); 123147543Scognet } 124166695Skevlo return (0); 125129198Scognet} 126129198Scognet 127129198Scognetint 128129198Scognetdb_access_irq_sp(struct db_variable *vp, db_expr_t *valp, int rw) 129129198Scognet{ 130129198Scognet 131147543Scognet if (rw == DB_VAR_GET) { 132129198Scognet *valp = get_stackptr(PSR_IRQ32_MODE); 133147543Scognet return (1); 134147543Scognet } 135166695Skevlo return (0); 136129198Scognet} 137129198Scognet 138147543Scognetint db_frame(struct db_variable *vp, db_expr_t *valp, int rw) 139147543Scognet{ 140147543Scognet int *reg; 141147543Scognet 142147543Scognet if (kdb_frame == NULL) 143147543Scognet return (0); 144147543Scognet 145147543Scognet reg = (int *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep); 146147543Scognet if (rw == DB_VAR_GET) 147147543Scognet *valp = *reg; 148147543Scognet else 149147543Scognet *reg = *valp; 150166695Skevlo return (1); 151147543Scognet} 152147543Scognet 153129198Scognetvoid 154129198Scognetdb_show_mdpcpu(struct pcpu *pc) 155129198Scognet{ 156293316Sskra 157293316Sskra#if __ARM_ARCH >= 6 158293316Sskra db_printf("curpmap = %p\n", pc->pc_curpmap); 159293316Sskra#endif 160129198Scognet} 161129198Scognetint 162129198Scognetdb_validate_address(vm_offset_t addr) 163129198Scognet{ 164129198Scognet struct proc *p = curproc; 165129198Scognet struct pmap *pmap; 166129198Scognet 167129198Scognet if (!p || !p->p_vmspace || !p->p_vmspace->vm_map.pmap || 168129198Scognet#ifndef ARM32_NEW_VM_LAYOUT 169129198Scognet addr >= VM_MAXUSER_ADDRESS 170129198Scognet#else 171129198Scognet addr >= VM_MIN_KERNEL_ADDRESS 172129198Scognet#endif 173129198Scognet ) 174295042Sskra pmap = kernel_pmap; 175129198Scognet else 176129198Scognet pmap = p->p_vmspace->vm_map.pmap; 177129198Scognet 178129198Scognet return (pmap_extract(pmap, addr) == FALSE); 179129198Scognet} 180129198Scognet 181129198Scognet/* 182129198Scognet * Read bytes from kernel address space for debugger. 183129198Scognet */ 184132059Scognetint 185129198Scognetdb_read_bytes(addr, size, data) 186129198Scognet vm_offset_t addr; 187129198Scognet size_t size; 188129198Scognet char *data; 189129198Scognet{ 190129198Scognet char *src = (char *)addr; 191129198Scognet 192129198Scognet if (db_validate_address((u_int)src)) { 193129198Scognet db_printf("address %p is invalid\n", src); 194132059Scognet return (-1); 195129198Scognet } 196129198Scognet 197129198Scognet if (size == 4 && (addr & 3) == 0 && ((uintptr_t)data & 3) == 0) { 198129198Scognet *((int*)data) = *((int*)src); 199132059Scognet return (0); 200129198Scognet } 201129198Scognet 202129198Scognet if (size == 2 && (addr & 1) == 0 && ((uintptr_t)data & 1) == 0) { 203129198Scognet *((short*)data) = *((short*)src); 204132059Scognet return (0); 205129198Scognet } 206129198Scognet 207129198Scognet while (size-- > 0) { 208129198Scognet if (db_validate_address((u_int)src)) { 209129198Scognet db_printf("address %p is invalid\n", src); 210132059Scognet return (-1); 211129198Scognet } 212129198Scognet *data++ = *src++; 213129198Scognet } 214132059Scognet return (0); 215129198Scognet} 216129198Scognet 217129198Scognet/* 218129198Scognet * Write bytes to kernel address space for debugger. 219129198Scognet */ 220132059Scognetint 221129198Scognetdb_write_bytes(vm_offset_t addr, size_t size, char *data) 222129198Scognet{ 223129198Scognet char *dst; 224129198Scognet size_t loop; 225129198Scognet 226129198Scognet dst = (char *)addr; 227129198Scognet if (db_validate_address((u_int)dst)) { 228129198Scognet db_printf("address %p is invalid\n", dst); 229132059Scognet return (0); 230129198Scognet } 231129198Scognet 232129198Scognet if (size == 4 && (addr & 3) == 0 && ((uintptr_t)data & 3) == 0) 233129198Scognet *((int*)dst) = *((int*)data); 234129198Scognet else 235129198Scognet if (size == 2 && (addr & 1) == 0 && ((uintptr_t)data & 1) == 0) 236129198Scognet *((short*)dst) = *((short*)data); 237129198Scognet else { 238129198Scognet loop = size; 239129198Scognet while (loop-- > 0) { 240129198Scognet if (db_validate_address((u_int)dst)) { 241129198Scognet db_printf("address %p is invalid\n", dst); 242132059Scognet return (-1); 243129198Scognet } 244129198Scognet *dst++ = *data++; 245129198Scognet } 246129198Scognet } 247129198Scognet 248129198Scognet /* make sure the caches and memory are in sync */ 249295319Smmel icache_sync(addr, size); 250129198Scognet 251129198Scognet /* In case the current page tables have been modified ... */ 252295319Smmel tlb_flush_all(); 253129198Scognet return (0); 254129198Scognet} 255129198Scognet 256129198Scognet 257137975Scognetstatic u_int 258137975Scognetdb_fetch_reg(int reg) 259137975Scognet{ 260129198Scognet 261137975Scognet switch (reg) { 262137975Scognet case 0: 263137975Scognet return (kdb_frame->tf_r0); 264137975Scognet case 1: 265137975Scognet return (kdb_frame->tf_r1); 266137975Scognet case 2: 267137975Scognet return (kdb_frame->tf_r2); 268137975Scognet case 3: 269137975Scognet return (kdb_frame->tf_r3); 270137975Scognet case 4: 271137975Scognet return (kdb_frame->tf_r4); 272137975Scognet case 5: 273137975Scognet return (kdb_frame->tf_r5); 274137975Scognet case 6: 275137975Scognet return (kdb_frame->tf_r6); 276137975Scognet case 7: 277137975Scognet return (kdb_frame->tf_r7); 278137975Scognet case 8: 279137975Scognet return (kdb_frame->tf_r8); 280137975Scognet case 9: 281137975Scognet return (kdb_frame->tf_r9); 282137975Scognet case 10: 283137975Scognet return (kdb_frame->tf_r10); 284137975Scognet case 11: 285137975Scognet return (kdb_frame->tf_r11); 286137975Scognet case 12: 287137975Scognet return (kdb_frame->tf_r12); 288137975Scognet case 13: 289137975Scognet return (kdb_frame->tf_svc_sp); 290137975Scognet case 14: 291137975Scognet return (kdb_frame->tf_svc_lr); 292137975Scognet case 15: 293137975Scognet return (kdb_frame->tf_pc); 294137975Scognet default: 295137975Scognet panic("db_fetch_reg: botch"); 296137975Scognet } 297137975Scognet} 298137975Scognet 299290273Szbbstatic u_int 300290273Szbbdb_branch_taken_read_int(void *cookie __unused, vm_offset_t offset, u_int *val) 301290273Szbb{ 302290273Szbb u_int ret; 303290273Szbb 304290273Szbb db_read_bytes(offset, 4, (char *)&ret); 305290273Szbb *val = ret; 306290273Szbb 307290273Szbb return (0); 308290273Szbb} 309290273Szbb 310290273Szbbstatic u_int 311290273Szbbdb_branch_taken_fetch_reg(void *cookie __unused, int reg) 312290273Szbb{ 313290273Szbb 314290273Szbb return (db_fetch_reg(reg)); 315290273Szbb} 316290273Szbb 317137975Scognetu_int 318137975Scognetbranch_taken(u_int insn, db_addr_t pc) 319137975Scognet{ 320290273Szbb register_t new_pc; 321290273Szbb int ret; 322137975Scognet 323290273Szbb ret = arm_predict_branch(NULL, insn, (register_t)pc, &new_pc, 324290273Szbb db_branch_taken_fetch_reg, db_branch_taken_read_int); 325181253Scognet 326290273Szbb if (ret != 0) 327290273Szbb kdb_reenter(); 328290273Szbb 329290273Szbb return (new_pc); 330137975Scognet} 331