mirror of https://gitee.com/openkylin/linux.git
215 lines
5.2 KiB
C
215 lines
5.2 KiB
C
/*
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* kgdb support for ARC
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*
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* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kgdb.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <asm/disasm.h>
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#include <asm/cacheflush.h>
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static void to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs,
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struct callee_regs *cregs)
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{
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int regno;
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for (regno = 0; regno <= 26; regno++)
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gdb_regs[_R0 + regno] = get_reg(regno, kernel_regs, cregs);
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for (regno = 27; regno < GDB_MAX_REGS; regno++)
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gdb_regs[regno] = 0;
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gdb_regs[_FP] = kernel_regs->fp;
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gdb_regs[__SP] = kernel_regs->sp;
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gdb_regs[_BLINK] = kernel_regs->blink;
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gdb_regs[_RET] = kernel_regs->ret;
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gdb_regs[_STATUS32] = kernel_regs->status32;
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gdb_regs[_LP_COUNT] = kernel_regs->lp_count;
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gdb_regs[_LP_END] = kernel_regs->lp_end;
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gdb_regs[_LP_START] = kernel_regs->lp_start;
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gdb_regs[_BTA] = kernel_regs->bta;
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gdb_regs[_STOP_PC] = kernel_regs->ret;
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}
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static void from_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs,
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struct callee_regs *cregs)
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{
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int regno;
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for (regno = 0; regno <= 26; regno++)
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set_reg(regno, gdb_regs[regno + _R0], kernel_regs, cregs);
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kernel_regs->fp = gdb_regs[_FP];
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kernel_regs->sp = gdb_regs[__SP];
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kernel_regs->blink = gdb_regs[_BLINK];
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kernel_regs->ret = gdb_regs[_RET];
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kernel_regs->status32 = gdb_regs[_STATUS32];
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kernel_regs->lp_count = gdb_regs[_LP_COUNT];
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kernel_regs->lp_end = gdb_regs[_LP_END];
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kernel_regs->lp_start = gdb_regs[_LP_START];
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kernel_regs->bta = gdb_regs[_BTA];
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}
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void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
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{
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to_gdb_regs(gdb_regs, kernel_regs, (struct callee_regs *)
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current->thread.callee_reg);
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}
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void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
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{
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from_gdb_regs(gdb_regs, kernel_regs, (struct callee_regs *)
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current->thread.callee_reg);
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}
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs,
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struct task_struct *task)
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{
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if (task)
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to_gdb_regs(gdb_regs, task_pt_regs(task),
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(struct callee_regs *) task->thread.callee_reg);
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}
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struct single_step_data_t {
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uint16_t opcode[2];
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unsigned long address[2];
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int is_branch;
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int armed;
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} single_step_data;
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static void undo_single_step(struct pt_regs *regs)
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{
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if (single_step_data.armed) {
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int i;
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for (i = 0; i < (single_step_data.is_branch ? 2 : 1); i++) {
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memcpy((void *) single_step_data.address[i],
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&single_step_data.opcode[i],
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BREAK_INSTR_SIZE);
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flush_icache_range(single_step_data.address[i],
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single_step_data.address[i] +
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BREAK_INSTR_SIZE);
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}
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single_step_data.armed = 0;
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}
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}
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static void place_trap(unsigned long address, void *save)
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{
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memcpy(save, (void *) address, BREAK_INSTR_SIZE);
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memcpy((void *) address, &arch_kgdb_ops.gdb_bpt_instr,
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BREAK_INSTR_SIZE);
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flush_icache_range(address, address + BREAK_INSTR_SIZE);
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}
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static void do_single_step(struct pt_regs *regs)
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{
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single_step_data.is_branch = disasm_next_pc((unsigned long)
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regs->ret, regs, (struct callee_regs *)
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current->thread.callee_reg,
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&single_step_data.address[0],
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&single_step_data.address[1]);
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place_trap(single_step_data.address[0], &single_step_data.opcode[0]);
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if (single_step_data.is_branch) {
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place_trap(single_step_data.address[1],
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&single_step_data.opcode[1]);
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}
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single_step_data.armed++;
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}
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int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
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char *remcomInBuffer, char *remcomOutBuffer,
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struct pt_regs *regs)
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{
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unsigned long addr;
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char *ptr;
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undo_single_step(regs);
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switch (remcomInBuffer[0]) {
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case 's':
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case 'c':
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ptr = &remcomInBuffer[1];
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if (kgdb_hex2long(&ptr, &addr))
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regs->ret = addr;
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case 'D':
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case 'k':
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atomic_set(&kgdb_cpu_doing_single_step, -1);
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if (remcomInBuffer[0] == 's') {
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do_single_step(regs);
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atomic_set(&kgdb_cpu_doing_single_step,
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smp_processor_id());
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}
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return 0;
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}
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return -1;
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}
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int kgdb_arch_init(void)
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{
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single_step_data.armed = 0;
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return 0;
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}
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void kgdb_trap(struct pt_regs *regs)
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{
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/* trap_s 3 is used for breakpoints that overwrite existing
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* instructions, while trap_s 4 is used for compiled breakpoints.
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*
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* with trap_s 3 breakpoints the original instruction needs to be
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* restored and continuation needs to start at the location of the
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* breakpoint.
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*
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* with trap_s 4 (compiled) breakpoints, continuation needs to
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* start after the breakpoint.
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*/
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if (regs->ecr_param == 3)
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instruction_pointer(regs) -= BREAK_INSTR_SIZE;
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kgdb_handle_exception(1, SIGTRAP, 0, regs);
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}
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void kgdb_arch_exit(void)
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{
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}
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void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
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{
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instruction_pointer(regs) = ip;
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}
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static void kgdb_call_nmi_hook(void *ignored)
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{
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kgdb_nmicallback(raw_smp_processor_id(), NULL);
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}
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void kgdb_roundup_cpus(unsigned long flags)
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{
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local_irq_enable();
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smp_call_function(kgdb_call_nmi_hook, NULL, 0);
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local_irq_disable();
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}
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struct kgdb_arch arch_kgdb_ops = {
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/* breakpoint instruction: TRAP_S 0x3 */
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#ifdef CONFIG_CPU_BIG_ENDIAN
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.gdb_bpt_instr = {0x78, 0x7e},
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#else
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.gdb_bpt_instr = {0x7e, 0x78},
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#endif
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};
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