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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 | // SPDX-License-Identifier: GPL-2.0-only /* * arch/hexagon/kernel/kgdb.c - Hexagon KGDB Support * * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. */ #include <linux/irq.h> #include <linux/sched.h> #include <linux/sched/task_stack.h> #include <linux/kdebug.h> #include <linux/kgdb.h> /* All registers are 4 bytes, for now */ #define GDB_SIZEOF_REG 4 /* The register names are used during printing of the regs; * Keep these at three letters to pretty-print. */ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { { " r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, r00)}, { " r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, r01)}, { " r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r02)}, { " r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r03)}, { " r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r04)}, { " r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r05)}, { " r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r06)}, { " r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r07)}, { " r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r08)}, { " r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r09)}, { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, r10)}, { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, r11)}, { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, r12)}, { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, r13)}, { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, r14)}, { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, r15)}, { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, r16)}, { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, r17)}, { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, r18)}, { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, r19)}, { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, r20)}, { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, r21)}, { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, r22)}, { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, r23)}, { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, r24)}, { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, r25)}, { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, r26)}, { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, r27)}, { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, r28)}, { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, r29)}, { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, r30)}, { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, r31)}, { "usr", GDB_SIZEOF_REG, offsetof(struct pt_regs, usr)}, { "preds", GDB_SIZEOF_REG, offsetof(struct pt_regs, preds)}, { " m0", GDB_SIZEOF_REG, offsetof(struct pt_regs, m0)}, { " m1", GDB_SIZEOF_REG, offsetof(struct pt_regs, m1)}, { "sa0", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa0)}, { "sa1", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa1)}, { "lc0", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc0)}, { "lc1", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc1)}, { " gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)}, { "ugp", GDB_SIZEOF_REG, offsetof(struct pt_regs, ugp)}, { "cs0", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs0)}, { "cs1", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs1)}, { "psp", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmpsp)}, { "elr", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmel)}, { "est", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmest)}, { "badva", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmbadva)}, { "restart_r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, restart_r0)}, { "syscall_nr", GDB_SIZEOF_REG, offsetof(struct pt_regs, syscall_nr)}, }; const struct kgdb_arch arch_kgdb_ops = { /* trap0(#0xDB) 0x0cdb0054 */ .gdb_bpt_instr = {0x54, 0x00, 0xdb, 0x0c}, }; char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return NULL; *((unsigned long *) mem) = *((unsigned long *) ((void *)regs + dbg_reg_def[regno].offset)); return dbg_reg_def[regno].name; } int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return -EINVAL; *((unsigned long *) ((void *)regs + dbg_reg_def[regno].offset)) = *((unsigned long *) mem); return 0; } void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) { instruction_pointer(regs) = pc; } /* Not yet working */ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) { struct pt_regs *thread_regs; if (task == NULL) return; /* Initialize to zero */ memset(gdb_regs, 0, NUMREGBYTES); /* Otherwise, we have only some registers from switch_to() */ thread_regs = task_pt_regs(task); gdb_regs[0] = thread_regs->r00; } /** * kgdb_arch_handle_exception - Handle architecture specific GDB packets. * @vector: The error vector of the exception that happened. * @signo: The signal number of the exception that happened. * @err_code: The error code of the exception that happened. * @remcom_in_buffer: The buffer of the packet we have read. * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into. * @regs: The &struct pt_regs of the current process. * * This function MUST handle the 'c' and 's' command packets, * as well packets to set / remove a hardware breakpoint, if used. * If there are additional packets which the hardware needs to handle, * they are handled here. The code should return -1 if it wants to * process more packets, and a %0 or %1 if it wants to exit from the * kgdb callback. * * Not yet working. */ int kgdb_arch_handle_exception(int vector, int signo, int err_code, char *remcom_in_buffer, char *remcom_out_buffer, struct pt_regs *linux_regs) { switch (remcom_in_buffer[0]) { case 's': case 'c': return 0; } /* Stay in the debugger. */ return -1; } static int __kgdb_notify(struct die_args *args, unsigned long cmd) { /* cpu roundup */ if (atomic_read(&kgdb_active) != -1) { kgdb_nmicallback(smp_processor_id(), args->regs); return NOTIFY_STOP; } if (user_mode(args->regs)) return NOTIFY_DONE; if (kgdb_handle_exception(args->trapnr & 0xff, args->signr, args->err, args->regs)) return NOTIFY_DONE; return NOTIFY_STOP; } static int kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr) { unsigned long flags; int ret; local_irq_save(flags); ret = __kgdb_notify(ptr, cmd); local_irq_restore(flags); return ret; } static struct notifier_block kgdb_notifier = { .notifier_call = kgdb_notify, /* * Lowest-prio notifier priority, we want to be notified last: */ .priority = -INT_MAX, }; /** * kgdb_arch_init - Perform any architecture specific initialization. * * This function will handle the initialization of any architecture * specific callbacks. */ int kgdb_arch_init(void) { return register_die_notifier(&kgdb_notifier); } /** * kgdb_arch_exit - Perform any architecture specific uninitalization. * * This function will handle the uninitalization of any architecture * specific callbacks, for dynamic registration and unregistration. */ void kgdb_arch_exit(void) { unregister_die_notifier(&kgdb_notifier); } |