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Commit c9d6bc7a authored by Colin Cross's avatar Colin Cross Committed by Amit Pundir
Browse files

ANDROID: fiq_debugger: add ARM64 support 



Add fiq_debugger_arm64.c that implements the platform-specific
functions.

Change-Id: I4d8b96777bb8503a93d4eb47bbde8e018740a5bf
Signed-off-by: default avatarColin Cross <ccross@android.com>

[AmitP: Remove unused stackframe -> sp to align with upstream commit
        31e43ad3 ("arm64: unwind: remove sp from struct stackframe")

        Also folded following android-4.9 commit changes into this patch
        a33d9f9fa333 ("ANDROID: fiq_debugger: Pass task parameter to unwind_frame()")]
Signed-off-by: default avatarAmit Pundir <amit.pundir@linaro.org>
parent efffceb1

drivers/staging/android/fiq_debugger/Kconfig

+1 −1
Original line number Diff line number Diff line 
config FIQ_DEBUGGER

	bool "FIQ Mode Serial Debugger"

	default n

	depends on ARM

	depends on ARM || ARM64

	help

	  The FIQ serial debugger can accept commands even when the

	  kernel is unresponsive due to being stuck with interrupts

drivers/staging/android/fiq_debugger/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-y			+= fiq_debugger.o

obj-$(CONFIG_ARM)	+= fiq_debugger_arm.o

obj-$(CONFIG_ARM64)	+= fiq_debugger_arm64.o
 
 No newline at end of file

drivers/staging/android/fiq_debugger/fiq_debugger_arm64.c

0 → 100644
+201 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Google, Inc.

 * Author: Colin Cross <ccross@android.com>

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/ptrace.h>

#include <asm/stacktrace.h>



#include "fiq_debugger_priv.h"



static char *mode_name(const struct pt_regs *regs)

{

	if (compat_user_mode(regs)) {

		return "USR";

	} else {

		switch (processor_mode(regs)) {

		case PSR_MODE_EL0t: return "EL0t";

		case PSR_MODE_EL1t: return "EL1t";

		case PSR_MODE_EL1h: return "EL1h";

		case PSR_MODE_EL2t: return "EL2t";

		case PSR_MODE_EL2h: return "EL2h";

		default: return "???";

		}

	}

}



void fiq_debugger_dump_pc(struct fiq_debugger_state *state,

		const struct pt_regs *regs)

{

	fiq_debugger_printf(state, " pc %016lx cpsr %08lx mode %s\n",

		regs->pc, regs->pstate, mode_name(regs));

}



void fiq_debugger_dump_regs_aarch32(struct fiq_debugger_state *state,

		const struct pt_regs *regs)

{

	fiq_debugger_printf(state, " r0 %08x  r1 %08x  r2 %08x  r3 %08x\n",

			regs->compat_usr(0), regs->compat_usr(1),

			regs->compat_usr(2), regs->compat_usr(3));

	fiq_debugger_printf(state, " r4 %08x  r5 %08x  r6 %08x  r7 %08x\n",

			regs->compat_usr(4), regs->compat_usr(5),

			regs->compat_usr(6), regs->compat_usr(7));

	fiq_debugger_printf(state, " r8 %08x  r9 %08x r10 %08x r11 %08x\n",

			regs->compat_usr(8), regs->compat_usr(9),

			regs->compat_usr(10), regs->compat_usr(11));

	fiq_debugger_printf(state, " ip %08x  sp %08x  lr %08x  pc %08x\n",

			regs->compat_usr(12), regs->compat_sp,

			regs->compat_lr, regs->pc);

	fiq_debugger_printf(state, " cpsr %08x (%s)\n",

			regs->pstate, mode_name(regs));

}



void fiq_debugger_dump_regs_aarch64(struct fiq_debugger_state *state,

		const struct pt_regs *regs)

{



	fiq_debugger_printf(state, "  x0 %016lx   x1 %016lx\n",

			regs->regs[0], regs->regs[1]);

	fiq_debugger_printf(state, "  x2 %016lx   x3 %016lx\n",

			regs->regs[2], regs->regs[3]);

	fiq_debugger_printf(state, "  x4 %016lx   x5 %016lx\n",

			regs->regs[4], regs->regs[5]);

	fiq_debugger_printf(state, "  x6 %016lx   x7 %016lx\n",

			regs->regs[6], regs->regs[7]);

	fiq_debugger_printf(state, "  x8 %016lx   x9 %016lx\n",

			regs->regs[8], regs->regs[9]);

	fiq_debugger_printf(state, " x10 %016lx  x11 %016lx\n",

			regs->regs[10], regs->regs[11]);

	fiq_debugger_printf(state, " x12 %016lx  x13 %016lx\n",

			regs->regs[12], regs->regs[13]);

	fiq_debugger_printf(state, " x14 %016lx  x15 %016lx\n",

			regs->regs[14], regs->regs[15]);

	fiq_debugger_printf(state, " x16 %016lx  x17 %016lx\n",

			regs->regs[16], regs->regs[17]);

	fiq_debugger_printf(state, " x18 %016lx  x19 %016lx\n",

			regs->regs[18], regs->regs[19]);

	fiq_debugger_printf(state, " x20 %016lx  x21 %016lx\n",

			regs->regs[20], regs->regs[21]);

	fiq_debugger_printf(state, " x22 %016lx  x23 %016lx\n",

			regs->regs[22], regs->regs[23]);

	fiq_debugger_printf(state, " x24 %016lx  x25 %016lx\n",

			regs->regs[24], regs->regs[25]);

	fiq_debugger_printf(state, " x26 %016lx  x27 %016lx\n",

			regs->regs[26], regs->regs[27]);

	fiq_debugger_printf(state, " x28 %016lx  x29 %016lx\n",

			regs->regs[28], regs->regs[29]);

	fiq_debugger_printf(state, " x30 %016lx   sp %016lx\n",

			regs->regs[30], regs->sp);

	fiq_debugger_printf(state, "  pc %016lx cpsr %08x (%s)\n",

			regs->pc, regs->pstate, mode_name(regs));

}



void fiq_debugger_dump_regs(struct fiq_debugger_state *state,

		const struct pt_regs *regs)

{

	if (compat_user_mode(regs))

		fiq_debugger_dump_regs_aarch32(state, regs);

	else

		fiq_debugger_dump_regs_aarch64(state, regs);

}



#define READ_SPECIAL_REG(x) ({ \

	u64 val; \

	asm volatile ("mrs %0, " # x : "=r"(val)); \

	val; \

})



void fiq_debugger_dump_allregs(struct fiq_debugger_state *state,

		const struct pt_regs *regs)

{

	u32 pstate = READ_SPECIAL_REG(CurrentEl);

	bool in_el2 = (pstate & PSR_MODE_MASK) >= PSR_MODE_EL2t;



	fiq_debugger_dump_regs(state, regs);



	fiq_debugger_printf(state, " sp_el0   %016lx\n",

			READ_SPECIAL_REG(sp_el0));



	if (in_el2)

		fiq_debugger_printf(state, " sp_el1   %016lx\n",

				READ_SPECIAL_REG(sp_el1));



	fiq_debugger_printf(state, " elr_el1  %016lx\n",

			READ_SPECIAL_REG(elr_el1));



	fiq_debugger_printf(state, " spsr_el1 %08lx\n",

			READ_SPECIAL_REG(spsr_el1));



	if (in_el2) {

		fiq_debugger_printf(state, " spsr_irq %08lx\n",

				READ_SPECIAL_REG(spsr_irq));

		fiq_debugger_printf(state, " spsr_abt %08lx\n",

				READ_SPECIAL_REG(spsr_abt));

		fiq_debugger_printf(state, " spsr_und %08lx\n",

				READ_SPECIAL_REG(spsr_und));

		fiq_debugger_printf(state, " spsr_fiq %08lx\n",

				READ_SPECIAL_REG(spsr_fiq));

		fiq_debugger_printf(state, " spsr_el2 %08lx\n",

				READ_SPECIAL_REG(elr_el2));

		fiq_debugger_printf(state, " spsr_el2 %08lx\n",

				READ_SPECIAL_REG(spsr_el2));

	}

}



struct stacktrace_state {

	struct fiq_debugger_state *state;

	unsigned int depth;

};



static int report_trace(struct stackframe *frame, void *d)

{

	struct stacktrace_state *sts = d;



	if (sts->depth) {

		fiq_debugger_printf(sts->state, "%pF:\n", frame->pc);

		fiq_debugger_printf(sts->state,

				"  pc %016lx   fp %016lx\n",

				frame->pc, frame->fp);

		sts->depth--;

		return 0;

	}

	fiq_debugger_printf(sts->state, "  ...\n");



	return sts->depth == 0;

}



void fiq_debugger_dump_stacktrace(struct fiq_debugger_state *state,

		const struct pt_regs *regs, unsigned int depth, void *ssp)

{

	struct thread_info *real_thread_info = THREAD_INFO(ssp);

	struct stacktrace_state sts;



	sts.depth = depth;

	sts.state = state;

	*current_thread_info() = *real_thread_info;



	if (!current)

		fiq_debugger_printf(state, "current NULL\n");

	else

		fiq_debugger_printf(state, "pid: %d  comm: %s\n",

			current->pid, current->comm);

	fiq_debugger_dump_regs(state, regs);



	if (!user_mode(regs)) {

		struct stackframe frame;

		frame.fp = regs->regs[29];

		frame.pc = regs->pc;

		fiq_debugger_printf(state, "\n");

		walk_stackframe(current, &frame, report_trace, &sts);

	}

}