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Merge pull request #1644 from polaris-/gdb-fixes

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Adopted WinterMute's gdbstub changes
This commit is contained in:
bunnei 2016-04-08 16:03:40 -04:00
commit a4c5d8fd50
2 changed files with 107 additions and 28 deletions
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108
src/core/gdbstub/gdbstub.cpp
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@ -60,6 +60,59 @@ const u32 R15_REGISTER = 15;
const u32 CPSR_REGISTER = 25;
const u32 FPSCR_REGISTER = 58;
// For sample XML files see the GDB source /gdb/features
// GDB also wants the l character at the start
// This XML defines what the registers are for this specific ARM device
static const char* target_xml =
R"(l<?xml version="1.0"?>
<!DOCTYPE target SYSTEM "gdb-target.dtd">
<target version="1.0">
<feature name="org.gnu.gdb.arm.core">
<reg name="r0" bitsize="32"/>
<reg name="r1" bitsize="32"/>
<reg name="r2" bitsize="32"/>
<reg name="r3" bitsize="32"/>
<reg name="r4" bitsize="32"/>
<reg name="r5" bitsize="32"/>
<reg name="r6" bitsize="32"/>
<reg name="r7" bitsize="32"/>
<reg name="r8" bitsize="32"/>
<reg name="r9" bitsize="32"/>
<reg name="r10" bitsize="32"/>
<reg name="r11" bitsize="32"/>
<reg name="r12" bitsize="32"/>
<reg name="sp" bitsize="32" type="data_ptr"/>
<reg name="lr" bitsize="32"/>
<reg name="pc" bitsize="32" type="code_ptr"/>
<!-- The CPSR is register 25, rather than register 16, because
the FPA registers historically were placed between the PC
and the CPSR in the "g" packet. -->
<reg name="cpsr" bitsize="32" regnum="25"/>
</feature>
<feature name="org.gnu.gdb.arm.vfp">
<reg name="d0" bitsize="64" type="float"/>
<reg name="d1" bitsize="64" type="float"/>
<reg name="d2" bitsize="64" type="float"/>
<reg name="d3" bitsize="64" type="float"/>
<reg name="d4" bitsize="64" type="float"/>
<reg name="d5" bitsize="64" type="float"/>
<reg name="d6" bitsize="64" type="float"/>
<reg name="d7" bitsize="64" type="float"/>
<reg name="d8" bitsize="64" type="float"/>
<reg name="d9" bitsize="64" type="float"/>
<reg name="d10" bitsize="64" type="float"/>
<reg name="d11" bitsize="64" type="float"/>
<reg name="d12" bitsize="64" type="float"/>
<reg name="d13" bitsize="64" type="float"/>
<reg name="d14" bitsize="64" type="float"/>
<reg name="d15" bitsize="64" type="float"/>
<reg name="fpscr" bitsize="32" type="int" group="float"/>
</feature>
</target>
)";
namespace GDBStub {
static int gdbserver_socket = -1;
@ -211,7 +264,7 @@ static u8 ReadByte() {
}
/// Calculate the checksum of the current command buffer.
static u8 CalculateChecksum(u8 *buffer, u32 length) {
static u8 CalculateChecksum(u8* buffer, u32 length) {
return static_cast<u8>(std::accumulate(buffer, buffer + length, 0, std::plus<u8>()));
}
@ -353,8 +406,15 @@ static void SendReply(const char* reply) {
static void HandleQuery() {
LOG_DEBUG(Debug_GDBStub, "gdb: query '%s'\n", command_buffer + 1);
if (!strcmp(reinterpret_cast<const char*>(command_buffer + 1), "TStatus")) {
const char* query = reinterpret_cast<const char*>(command_buffer + 1);
if (strcmp(query, "TStatus") == 0 ) {
SendReply("T0");
} else if (strncmp(query, "Supported:", strlen("Supported:")) == 0) {
// PacketSize needs to be large enough for target xml
SendReply("PacketSize=800;qXfer:features:read+");
} else if (strncmp(query, "Xfer:features:read:target.xml:", strlen("Xfer:features:read:target.xml:")) == 0) {
SendReply(target_xml);
} else {
SendReply("");
}
@ -491,29 +551,25 @@ static void ReadRegisters() {
memset(buffer, 0, sizeof(buffer));
u8* bufptr = buffer;
for (int i = 0, reg = 0; reg <= FPSCR_REGISTER; i++, reg++) {
if (reg <= R15_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetReg(reg));
} else if (reg == CPSR_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetCPSR());
} else if (reg == CPSR_REGISTER - 1) {
// Dummy FPA register, ignore
IntToGdbHex(bufptr + i * CHAR_BIT, 0);
} else if (reg < CPSR_REGISTER) {
// Dummy FPA registers, ignore
IntToGdbHex(bufptr + i * CHAR_BIT, 0);
IntToGdbHex(bufptr + (i + 1) * CHAR_BIT, 0);
IntToGdbHex(bufptr + (i + 2) * CHAR_BIT, 0);
i += 2;
} else if (reg > CPSR_REGISTER && reg < FPSCR_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetVFPReg(reg - CPSR_REGISTER - 1));
IntToGdbHex(bufptr + (i + 1) * CHAR_BIT, 0);
i++;
} else if (reg == FPSCR_REGISTER) {
IntToGdbHex(bufptr + i * CHAR_BIT, Core::g_app_core->GetVFPSystemReg(VFP_FPSCR));
}
for (int reg = 0; reg <= R15_REGISTER; reg++) {
IntToGdbHex(bufptr + reg * CHAR_BIT, Core::g_app_core->GetReg(reg));
}
bufptr += (16 * CHAR_BIT);
IntToGdbHex(bufptr, Core::g_app_core->GetCPSR());
bufptr += CHAR_BIT;
for (int reg = 0; reg <= 31; reg++) {
IntToGdbHex(bufptr + reg * CHAR_BIT, Core::g_app_core->GetVFPReg(reg));
}
bufptr += (32 * CHAR_BIT);
IntToGdbHex(bufptr, Core::g_app_core->GetVFPSystemReg(VFP_FPSCR));
SendReply(reinterpret_cast<char*>(buffer));
}
@ -885,6 +941,12 @@ void Init(u16 port) {
LOG_ERROR(Debug_GDBStub, "Failed to create gdb socket");
}
// Set socket to SO_REUSEADDR so it can always bind on the same port
int reuse_enabled = 1;
if (setsockopt(tmpsock, SOL_SOCKET, SO_REUSEADDR, (const char*)&reuse_enabled, sizeof(reuse_enabled)) < 0) {
LOG_ERROR(Debug_GDBStub, "Failed to set gdb socket option");
}
const sockaddr* server_addr = reinterpret_cast<const sockaddr*>(&saddr_server);
socklen_t server_addrlen = sizeof(saddr_server);
if (bind(tmpsock, server_addr, server_addrlen) < 0) {