^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * kgdb support for ARC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kgdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/disasm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static void to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct callee_regs *cregs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) int regno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) for (regno = 0; regno <= 26; regno++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) gdb_regs[_R0 + regno] = get_reg(regno, kernel_regs, cregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) for (regno = 27; regno < GDB_MAX_REGS; regno++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) gdb_regs[regno] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) gdb_regs[_FP] = kernel_regs->fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) gdb_regs[__SP] = kernel_regs->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) gdb_regs[_BLINK] = kernel_regs->blink;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) gdb_regs[_RET] = kernel_regs->ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) gdb_regs[_STATUS32] = kernel_regs->status32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) gdb_regs[_LP_COUNT] = kernel_regs->lp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) gdb_regs[_LP_END] = kernel_regs->lp_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) gdb_regs[_LP_START] = kernel_regs->lp_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) gdb_regs[_BTA] = kernel_regs->bta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) gdb_regs[_STOP_PC] = kernel_regs->ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static void from_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct callee_regs *cregs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int regno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) for (regno = 0; regno <= 26; regno++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) set_reg(regno, gdb_regs[regno + _R0], kernel_regs, cregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) kernel_regs->fp = gdb_regs[_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) kernel_regs->sp = gdb_regs[__SP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) kernel_regs->blink = gdb_regs[_BLINK];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) kernel_regs->ret = gdb_regs[_RET];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) kernel_regs->status32 = gdb_regs[_STATUS32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) kernel_regs->lp_count = gdb_regs[_LP_COUNT];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) kernel_regs->lp_end = gdb_regs[_LP_END];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) kernel_regs->lp_start = gdb_regs[_LP_START];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) kernel_regs->bta = gdb_regs[_BTA];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) to_gdb_regs(gdb_regs, kernel_regs, (struct callee_regs *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) current->thread.callee_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) from_gdb_regs(gdb_regs, kernel_regs, (struct callee_regs *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) current->thread.callee_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) to_gdb_regs(gdb_regs, task_pt_regs(task),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) (struct callee_regs *) task->thread.callee_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct single_step_data_t {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) uint16_t opcode[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) unsigned long address[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) int is_branch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int armed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) } single_step_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static void undo_single_step(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (single_step_data.armed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) for (i = 0; i < (single_step_data.is_branch ? 2 : 1); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) memcpy((void *) single_step_data.address[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) &single_step_data.opcode[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) flush_icache_range(single_step_data.address[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) single_step_data.address[i] +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) single_step_data.armed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void place_trap(unsigned long address, void *save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) memcpy(save, (void *) address, BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) memcpy((void *) address, &arch_kgdb_ops.gdb_bpt_instr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) flush_icache_range(address, address + BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static void do_single_step(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) single_step_data.is_branch = disasm_next_pc((unsigned long)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) regs->ret, regs, (struct callee_regs *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) current->thread.callee_reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) &single_step_data.address[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) &single_step_data.address[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) place_trap(single_step_data.address[0], &single_step_data.opcode[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (single_step_data.is_branch) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) place_trap(single_step_data.address[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) &single_step_data.opcode[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) single_step_data.armed++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) char *remcomInBuffer, char *remcomOutBuffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) undo_single_step(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) switch (remcomInBuffer[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) case 's':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ptr = &remcomInBuffer[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (kgdb_hex2long(&ptr, &addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) regs->ret = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) case 'D':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) case 'k':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) atomic_set(&kgdb_cpu_doing_single_step, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (remcomInBuffer[0] == 's') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) do_single_step(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) atomic_set(&kgdb_cpu_doing_single_step,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int kgdb_arch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) single_step_data.armed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) void kgdb_trap(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* trap_s 3 is used for breakpoints that overwrite existing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * instructions, while trap_s 4 is used for compiled breakpoints.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * with trap_s 3 breakpoints the original instruction needs to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * restored and continuation needs to start at the location of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * breakpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * with trap_s 4 (compiled) breakpoints, continuation needs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * start after the breakpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (regs->ecr_param == 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) instruction_pointer(regs) -= BREAK_INSTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) kgdb_handle_exception(1, SIGTRAP, 0, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) void kgdb_arch_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) instruction_pointer(regs) = ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) void kgdb_call_nmi_hook(void *ignored)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Default implementation passes get_irq_regs() but we don't */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) kgdb_nmicallback(raw_smp_processor_id(), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) const struct kgdb_arch arch_kgdb_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* breakpoint instruction: TRAP_S 0x3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) #ifdef CONFIG_CPU_BIG_ENDIAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .gdb_bpt_instr = {0x78, 0x7e},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) .gdb_bpt_instr = {0x7e, 0x78},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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