Merge "Fix null pointer dereference in RegsArm." into pi-dev (8dc3f941) · Commits · e / os / android_system_core

libunwindstack/RegsArm.cpp

+12 −2

Original line number	Diff line number	Diff line
		@@ -51,14 +51,24 @@ void RegsArm::set_sp(uint64_t sp) {
		}

		uint64_t RegsArm::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
		if (!elf->valid()) {
		return 2;
		}

		uint64_t load_bias = elf->GetLoadBias();
		if (rel_pc < load_bias) {
		if (rel_pc < 2) {
		return 0;
		}
		return 2;
		}
		uint64_t adjusted_rel_pc = rel_pc - load_bias;
		if (adjusted_rel_pc < 5) {
		if (adjusted_rel_pc < 2) {
		return 0;
		}
		return 2;
		}

		if (adjusted_rel_pc & 1) {
		// This is a thumb instruction, it could be 2 or 4 bytes.

+2 −2

Original line number	Diff line number	Diff line
		@@ -51,8 +51,8 @@ void RegsArm64::set_sp(uint64_t sp) {
		regs_[ARM64_REG_SP] = sp;
		}

		uint64_t RegsArm64::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
		if (!elf->valid() \|\| rel_pc < 4) {
		uint64_t RegsArm64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
		if (rel_pc < 4) {
		return 0;
		}
		return 4;

+2 −2

Original line number	Diff line number	Diff line
		@@ -51,8 +51,8 @@ void RegsMips::set_sp(uint64_t sp) {
		regs_[MIPS_REG_SP] = static_cast<uint32_t>(sp);
		}

		uint64_t RegsMips::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
		if (!elf->valid() \|\| rel_pc < 8) {
		uint64_t RegsMips::GetPcAdjustment(uint64_t rel_pc, Elf*) {
		if (rel_pc < 8) {
		return 0;
		}
		// For now, just assume no compact branches

+2 −2

Original line number	Diff line number	Diff line
		@@ -51,8 +51,8 @@ void RegsMips64::set_sp(uint64_t sp) {
		regs_[MIPS64_REG_SP] = sp;
		}

		uint64_t RegsMips64::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
		if (!elf->valid() \|\| rel_pc < 8) {
		uint64_t RegsMips64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
		if (rel_pc < 8) {
		return 0;
		}
		// For now, just assume no compact branches

+2 −2

Original line number	Diff line number	Diff line
		@@ -50,8 +50,8 @@ void RegsX86::set_sp(uint64_t sp) {
		regs_[X86_REG_SP] = static_cast<uint32_t>(sp);
		}

		uint64_t RegsX86::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
		if (!elf->valid() \|\| rel_pc == 0) {
		uint64_t RegsX86::GetPcAdjustment(uint64_t rel_pc, Elf*) {
		if (rel_pc == 0) {
		return 0;
		}
		return 1;