am 05a28e1c: Merge "Enhance debuggerd memory dumps" (85e06657) · Commits · e / os / android_system_core

debuggerd/arm/machine.c

+103 −54

Original line number	Diff line number	Diff line
		@@ -36,6 +36,9 @@

		#include "utility.h"

		/* enable to dump memory pointed to by every register */
		#define DUMP_MEM_FOR_ALL_REGS 0

		#ifdef WITH_VFP
		#ifdef WITH_VFP_D32
		#define NUM_VFP_REGS 32
		@@ -117,82 +120,128 @@ static void show_nearby_maps(int tfd, int pid, mapinfo *map)
		}
		}


		void dump_stack_and_code(int tfd, int pid, mapinfo *map,
		int unwind_depth, unsigned int sp_list[],
		bool at_fault)
		/*
		* Dumps a few bytes of memory, starting a bit before and ending a bit
		* after the specified address.
		*/
		static void dump_memory(int tfd, int pid, uintptr_t addr,
		bool only_in_tombstone)
		{
		unsigned int sp, pc, lr, p, end, data;
		struct pt_regs r;
		int sp_depth;
		bool only_in_tombstone = !at_fault;
		char code_buffer[80];

		if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
		sp = r.ARM_sp;
		pc = r.ARM_pc;
		lr = r.ARM_lr;

		_LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
		char code_buffer[64]; /* actual 8+1+((8+1)4) + 1 == 45 /
		char ascii_buffer[32]; /* actual 16 + 1 == 17 */
		uintptr_t p, end;

		p = pc & ~3;
		p = addr & ~3;
		p -= 32;
		if (p > pc)
		if (p > addr) {
		/* catch underflow */
		p = 0;
		}
		end = p + 80;
		/* 'end - p' has to be multiples of 16 */
		/* catch overflow; 'end - p' has to be multiples of 16 */
		while (end < p)
		end -= 16;

		/* Dump the code around PC as:
		* addr contents
		* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
		* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
		* addr contents ascii
		* 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q
		* 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p......
		*/
		while (p < end) {
		int i;
		char* asc_out = ascii_buffer;

		sprintf(code_buffer, "%08x ", p);

		int i;
		for (i = 0; i < 4; i++) {
		data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
		/*
		* If we see (data == -1 && errno != 0), we know that the ptrace
		* call failed, probably because we're dumping memory in an
		* unmapped or inaccessible page. I don't know if there's
		* value in making that explicit in the output -- it likely
		* just complicates parsing and clarifies nothing for the
		* enlightened reader.
		*/
		long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		sprintf(code_buffer + strlen(code_buffer), "%08lx ", data);

		int j;
		for (j = 0; j < 4; j++) {
		/*
		* Our isprint() allows high-ASCII characters that display
		* differently (often badly) in different viewers, so we
		* just use a simpler test.
		*/
		char val = (data >> (j*8)) & 0xff;
		if (val >= 0x20 && val < 0x7f) {
		*asc_out++ = val;
		} else {
		*asc_out++ = '.';
		}
		}
		p += 4;
		}
		_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
		*asc_out = '\0';
		_LOG(tfd, only_in_tombstone, "%s %s\n", code_buffer, ascii_buffer);
		}

		if (lr != pc) {
		_LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
		}

		p = lr & ~3;
		p -= 32;
		if (p > lr)
		p = 0;
		end = p + 80;
		/* 'end - p' has to be multiples of 16 */
		while (end < p)
		end -= 16;
		void dump_stack_and_code(int tfd, int pid, mapinfo *map,
		int unwind_depth, unsigned int sp_list[],
		bool at_fault)
		{
		struct pt_regs r;
		int sp_depth;
		bool only_in_tombstone = !at_fault;

		if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;

		/* Dump the code around LR as:
		* addr contents
		* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
		* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
		if (DUMP_MEM_FOR_ALL_REGS && at_fault) {
		/*
		* If configured to do so, dump memory around all registers
		* for the crashing thread.
		*
		* TODO: remove duplicates.
		*/
		while (p < end) {
		int i;
		static const char REG_NAMES[] = "R0R1R2R3R4R5R6R7R8R9SLFPIPSPLRPC";

		sprintf(code_buffer, "%08x ", p);
		for (i = 0; i < 4; i++) {
		data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
		p += 4;
		int reg;
		for (reg = 0; reg < 16; reg++) {
		/* this may not be a valid way to access, but it'll do for now */
		uintptr_t addr = r.uregs[reg];

		/*
		* Don't bother if it looks like a small int or ~= null, or if
		* it's in the kernel area.
		*/
		if (addr < 4096 \|\| addr >= 0xc0000000) {
		continue;
		}

		_LOG(tfd, only_in_tombstone, "\nmem near %.2s:\n",
		&REG_NAMES[reg*2]);
		dump_memory(tfd, pid, addr, false);
		}
		_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
		} else {
		unsigned int pc, lr;
		pc = r.ARM_pc;
		lr = r.ARM_lr;

		_LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
		dump_memory(tfd, pid, (uintptr_t) pc, only_in_tombstone);

		if (lr != pc) {
		_LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
		dump_memory(tfd, pid, (uintptr_t) lr, only_in_tombstone);
		}
		}

		show_nearby_maps(tfd, pid, map);

		unsigned int p, end;
		unsigned int sp = r.ARM_sp;

		p = sp - 64;
		if (p > sp)
		p = 0;
		@@ -227,7 +276,7 @@ void dump_stack_and_code(int tfd, int pid, mapinfo *map,
		while (p <= end) {
		char *prompt;
		char level[16];
		data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		if (p == sp_list[sp_depth]) {
		sprintf(level, "#%02d", sp_depth++);
		prompt = level;
		@@ -252,7 +301,7 @@ void dump_stack_and_code(int tfd, int pid, mapinfo *map,
		end = ~7;

		while (p <= end) {
		data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		long data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
		_LOG(tfd, (sp_depth > 2) \|\| only_in_tombstone,
		" %08x %08x %s\n", p, data,
		map_to_name(map, data, ""));