ARC: kgdb support
Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Jason Wessel <jason.wessel@windriver.com> Acked-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Mischa Jonker
Vineet Gupta
parent
2e651ea159
commit
f46121bd26
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@ -22,6 +22,7 @@ config ARC
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select GENERIC_PENDING_IRQ if SMP
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select GENERIC_SIGALTSTACK
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select GENERIC_SMP_IDLE_THREAD
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_TRACEHOOK
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select HAVE_GENERIC_HARDIRQS
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select HAVE_KPROBES
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@ -378,7 +379,7 @@ config ARC_DW2_UNWIND
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config ARC_DBG_TLB_PARANOIA
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bool "Paranoia Checks in Low Level TLB Handlers"
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depends on ARC_DBG && !SMP
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depends on ARC_DBG
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default n
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config ARC_DBG_TLB_MISS_COUNT
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@ -0,0 +1,61 @@
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/*
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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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#ifndef __ARC_KGDB_H__
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#define __ARC_KGDB_H__
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#ifdef CONFIG_KGDB
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#include <asm/user.h>
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/* to ensure compatibility with Linux 2.6.35, we don't implement the get/set
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* register API yet */
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#undef DBG_MAX_REG_NUM
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#define GDB_MAX_REGS 39
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#define BREAK_INSTR_SIZE 2
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#define CACHE_FLUSH_IS_SAFE 1
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#define NUMREGBYTES (GDB_MAX_REGS * 4)
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#define BUFMAX 2048
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static inline void arch_kgdb_breakpoint(void)
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{
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__asm__ __volatile__ ("trap_s 0x4\n");
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}
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extern void kgdb_trap(struct pt_regs *regs, int param);
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enum arc700_linux_regnums {
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_R0 = 0,
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_R1, _R2, _R3, _R4, _R5, _R6, _R7, _R8, _R9, _R10, _R11, _R12, _R13,
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_R14, _R15, _R16, _R17, _R18, _R19, _R20, _R21, _R22, _R23, _R24,
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_R25, _R26,
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_BTA = 27,
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_LP_START = 28,
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_LP_END = 29,
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_LP_COUNT = 30,
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_STATUS32 = 31,
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_BLINK = 32,
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_FP = 33,
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__SP = 34,
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_EFA = 35,
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_RET = 36,
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_ORIG_R8 = 37,
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_STOP_PC = 38
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};
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#else
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static inline void kgdb_trap(struct pt_regs *regs, int param)
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{
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}
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#endif
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#endif /* __ARC_KGDB_H__ */
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@ -17,6 +17,7 @@ obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_ARC_DW2_UNWIND) += unwind.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_ARC_MISALIGN_ACCESS) += unaligned.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
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CFLAGS_fpu.o += -mdpfp
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@ -0,0 +1,205 @@
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/*
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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 <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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unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
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{
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return instruction_pointer(regs);
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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, int param)
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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 (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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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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@ -20,6 +20,7 @@
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#include <asm/setup.h>
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#include <asm/kprobes.h>
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#include <asm/unaligned.h>
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#include <asm/kgdb.h>
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void __init trap_init(void)
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{
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@ -141,6 +142,11 @@ void do_non_swi_trap(unsigned long cause, unsigned long address,
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trap_is_kprobe(param, address, regs);
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break;
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case 3:
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case 4:
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kgdb_trap(regs, param);
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break;
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default:
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break;
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}
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