gdbstub: Update registers and sizes for aarch64
This gets gdbstub working at least to the point where clients can communicate with it. What works: - Reading/writing GPRegs - Reading/writing memory - Interrupting the emulated program and continuing What does NOT work: - Breakpoints. Sizes have been updated to u64, but support will need to be added in the interpreter for them to work. - VRegs. Mostly because my gdb was having issues with 128-bit regs for some reason. However, the current u128 representation is a bit awkward to use and should probably be updated first.
This commit is contained in:
Rozlette
parent
d904b0db58
commit
425a78ec1b
1 changed files with 154 additions and 112 deletions
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@ -57,9 +57,10 @@ const u32 SIGTERM = 15;
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const u32 MSG_WAITALL = 8;
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#endif
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const u32 R15_REGISTER = 15;
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const u32 CPSR_REGISTER = 25;
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const u32 FPSCR_REGISTER = 58;
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const u32 X30_REGISTER = 30;
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const u32 SP_REGISTER = 31;
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const u32 PC_REGISTER = 32;
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const u32 CPSR_REGISTER = 33;
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// For sample XML files see the GDB source /gdb/features
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// GDB also wants the l character at the start
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@ -68,48 +69,62 @@ static const char* target_xml =
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R"(l<?xml version="1.0"?>
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<!DOCTYPE target SYSTEM "gdb-target.dtd">
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<target version="1.0">
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<feature name="org.gnu.gdb.arm.core">
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<reg name="r0" bitsize="32"/>
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<reg name="r1" bitsize="32"/>
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<reg name="r2" bitsize="32"/>
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<reg name="r3" bitsize="32"/>
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<reg name="r4" bitsize="32"/>
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<reg name="r5" bitsize="32"/>
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<reg name="r6" bitsize="32"/>
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<reg name="r7" bitsize="32"/>
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<reg name="r8" bitsize="32"/>
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<reg name="r9" bitsize="32"/>
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<reg name="r10" bitsize="32"/>
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<reg name="r11" bitsize="32"/>
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<reg name="r12" bitsize="32"/>
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<reg name="sp" bitsize="32" type="data_ptr"/>
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<reg name="lr" bitsize="32"/>
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<reg name="pc" bitsize="32" type="code_ptr"/>
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<feature name="org.gnu.gdb.aarch64.core">
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<reg name="x0" bitsize="64"/>
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<reg name="x1" bitsize="64"/>
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<reg name="x2" bitsize="64"/>
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<reg name="x3" bitsize="64"/>
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<reg name="x4" bitsize="64"/>
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<reg name="x5" bitsize="64"/>
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<reg name="x6" bitsize="64"/>
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<reg name="x7" bitsize="64"/>
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<reg name="x8" bitsize="64"/>
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<reg name="x9" bitsize="64"/>
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<reg name="x10" bitsize="64"/>
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<reg name="x11" bitsize="64"/>
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<reg name="x12" bitsize="64"/>
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<reg name="x13" bitsize="64"/>
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<reg name="x14" bitsize="64"/>
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<reg name="x15" bitsize="64"/>
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<reg name="x16" bitsize="64"/>
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<reg name="x17" bitsize="64"/>
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<reg name="x18" bitsize="64"/>
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<reg name="x19" bitsize="64"/>
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<reg name="x20" bitsize="64"/>
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<reg name="x21" bitsize="64"/>
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<reg name="x22" bitsize="64"/>
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<reg name="x23" bitsize="64"/>
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<reg name="x24" bitsize="64"/>
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<reg name="x25" bitsize="64"/>
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<reg name="x26" bitsize="64"/>
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<reg name="x27" bitsize="64"/>
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<reg name="x28" bitsize="64"/>
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<reg name="x29" bitsize="64"/>
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<reg name="x30" bitsize="64"/>
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<reg name="sp" bitsize="64" type="data_ptr"/>
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<!-- The CPSR is register 25, rather than register 16, because
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the FPA registers historically were placed between the PC
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and the CPSR in the "g" packet. -->
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<reg name="pc" bitsize="64" type="code_ptr"/>
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<reg name="cpsr" bitsize="32" regnum="25"/>
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</feature>
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<feature name="org.gnu.gdb.arm.vfp">
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<reg name="d0" bitsize="64" type="float"/>
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<reg name="d1" bitsize="64" type="float"/>
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<reg name="d2" bitsize="64" type="float"/>
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<reg name="d3" bitsize="64" type="float"/>
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<reg name="d4" bitsize="64" type="float"/>
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<reg name="d5" bitsize="64" type="float"/>
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<reg name="d6" bitsize="64" type="float"/>
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<reg name="d7" bitsize="64" type="float"/>
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<reg name="d8" bitsize="64" type="float"/>
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<reg name="d9" bitsize="64" type="float"/>
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<reg name="d10" bitsize="64" type="float"/>
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<reg name="d11" bitsize="64" type="float"/>
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<reg name="d12" bitsize="64" type="float"/>
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<reg name="d13" bitsize="64" type="float"/>
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<reg name="d14" bitsize="64" type="float"/>
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<reg name="d15" bitsize="64" type="float"/>
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<reg name="fpscr" bitsize="32" type="int" group="float"/>
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<flags id="cpsr_flags" size="4">
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<field name="SP" start="0" end="0"/>
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<field name="" start="1" end="1"/>
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<field name="EL" start="2" end="3"/>
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<field name="nRW" start="4" end="4"/>
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<field name="" start="5" end="5"/>
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<field name="F" start="6" end="6"/>
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<field name="I" start="7" end="7"/>
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<field name="A" start="8" end="8"/>
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<field name="D" start="9" end="9"/>
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<field name="IL" start="20" end="20"/>
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<field name="SS" start="21" end="21"/>
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<field name="V" start="28" end="28"/>
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<field name="C" start="29" end="29"/>
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<field name="Z" start="30" end="30"/>
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<field name="N" start="31" end="31"/>
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</flags>
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<reg name="cpsr" bitsize="32" type="cpsr_flags"/>
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</feature>
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</target>
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)";
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@ -143,12 +158,12 @@ WSADATA InitData;
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struct Breakpoint {
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bool active;
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PAddr addr;
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u32 len;
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u64 len;
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};
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static std::map<u32, Breakpoint> breakpoints_execute;
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static std::map<u32, Breakpoint> breakpoints_read;
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static std::map<u32, Breakpoint> breakpoints_write;
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static std::map<u64, Breakpoint> breakpoints_execute;
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static std::map<u64, Breakpoint> breakpoints_read;
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static std::map<u64, Breakpoint> breakpoints_write;
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/**
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* Turns hex string character into the equivalent byte.
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@ -197,6 +212,21 @@ static u32 HexToInt(const u8* src, size_t len) {
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return output;
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}
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/**
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* Converts input hex string characters into an array of equivalent of u8 bytes.
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*
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* @param src Pointer to array of output hex string characters.
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* @param len Length of src array.
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*/
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static u64 HexToLong(const u8* src, size_t len) {
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u64 output = 0;
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while (len-- > 0) {
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output = (output << 4) | HexCharToValue(src[0]);
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src++;
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}
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return output;
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}
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/**
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* Converts input array of u8 bytes into their equivalent hex string characters.
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*
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@ -234,8 +264,21 @@ static void GdbHexToMem(u8* dest, const u8* src, size_t len) {
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*/
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static void IntToGdbHex(u8* dest, u32 v) {
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for (int i = 0; i < 8; i += 2) {
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dest[i + 1] = NibbleToHex(v >> (4 * i));
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dest[i] = NibbleToHex(v >> (4 * (i + 1)));
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dest[i + 1] = NibbleToHex(static_cast<u8>(v >> (4 * i)));
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dest[i] = NibbleToHex(static_cast<u8>(v >> (4 * (i + 1))));
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}
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}
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/**
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* Convert a u64 into a gdb-formatted hex string.
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*
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* @param dest Pointer to buffer to store output hex string characters.
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* @param v Value to convert.
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*/
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static void LongToGdbHex(u8* dest, u64 v) {
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for (int i = 0; i < 16; i += 2) {
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dest[i + 1] = NibbleToHex(static_cast<u8>(v >> (4 * i)));
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dest[i] = NibbleToHex(static_cast<u8>(v >> (4 * (i + 1))));
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}
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}
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@ -255,6 +298,22 @@ static u32 GdbHexToInt(const u8* src) {
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return output;
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}
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/**
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* Convert a gdb-formatted hex string into a u64.
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*
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* @param src Pointer to hex string.
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*/
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static u64 GdbHexToLong(const u8* src) {
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u64 output = 0;
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for (int i = 0; i < 16; i += 2) {
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output = (output << 4) | HexCharToValue(src[15 - i - 1]);
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output = (output << 4) | HexCharToValue(src[15 - i]);
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}
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return output;
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}
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/// Read a byte from the gdb client.
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static u8 ReadByte() {
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u8 c;
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@ -277,7 +336,7 @@ static u8 CalculateChecksum(const u8* buffer, size_t length) {
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*
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* @param type Type of breakpoint list.
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*/
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static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
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static std::map<u64, Breakpoint>& GetBreakpointList(BreakpointType type) {
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switch (type) {
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case BreakpointType::Execute:
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return breakpoints_execute;
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@ -297,19 +356,19 @@ static std::map<u32, Breakpoint>& GetBreakpointList(BreakpointType type) {
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* @param addr Address of breakpoint.
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*/
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static void RemoveBreakpoint(BreakpointType type, PAddr addr) {
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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std::map<u64, Breakpoint>& p = GetBreakpointList(type);
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auto bp = p.find(static_cast<u32>(addr));
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auto bp = p.find(static_cast<u64>(addr));
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if (bp != p.end()) {
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LOG_DEBUG(Debug_GDBStub, "gdb: removed a breakpoint: %08x bytes at %08x of type %d\n",
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bp->second.len, bp->second.addr, type);
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p.erase(static_cast<u32>(addr));
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p.erase(static_cast<u64>(addr));
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}
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}
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BreakpointAddress GetNextBreakpointFromAddress(PAddr addr, BreakpointType type) {
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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auto next_breakpoint = p.lower_bound(static_cast<u32>(addr));
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std::map<u64, Breakpoint>& p = GetBreakpointList(type);
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auto next_breakpoint = p.lower_bound(static_cast<u64>(addr));
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BreakpointAddress breakpoint;
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if (next_breakpoint != p.end()) {
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@ -328,11 +387,11 @@ bool CheckBreakpoint(PAddr addr, BreakpointType type) {
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return false;
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}
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std::map<u32, Breakpoint>& p = GetBreakpointList(type);
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std::map<u64, Breakpoint>& p = GetBreakpointList(type);
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auto bp = p.find(static_cast<u32>(addr));
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auto bp = p.find(static_cast<u64>(addr));
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if (bp != p.end()) {
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u32 len = bp->second.len;
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u64 len = bp->second.len;
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// IDA Pro defaults to 4-byte breakpoints for all non-hardware breakpoints
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// no matter if it's a 4-byte or 2-byte instruction. When you execute a
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@ -419,7 +478,7 @@ static void HandleQuery() {
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SendReply("T0");
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} else if (strncmp(query, "Supported", strlen("Supported")) == 0) {
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// PacketSize needs to be large enough for target xml
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SendReply("PacketSize=800;qXfer:features:read+");
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SendReply("PacketSize=2000;qXfer:features:read+");
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} else if (strncmp(query, "Xfer:features:read:target.xml:",
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strlen("Xfer:features:read:target.xml:")) == 0) {
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SendReply(target_xml);
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@ -450,10 +509,7 @@ static void SendSignal(u32 signal) {
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latest_signal = signal;
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std::string buffer =
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Common::StringFromFormat("T%02x%02x:%08x;%02x:%08x;", latest_signal, 15,
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htonl(static_cast<u_long>(Core::CPU().GetPC())), 13,
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htonl(static_cast<u_long>(Core::CPU().GetReg(13))));
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std::string buffer = Common::StringFromFormat("T%02x", latest_signal);
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LOG_DEBUG(Debug_GDBStub, "Response: %s", buffer.c_str());
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SendReply(buffer.c_str());
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}
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@ -539,16 +595,12 @@ static void ReadRegister() {
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id |= HexCharToValue(command_buffer[2]);
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}
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if (id <= R15_REGISTER) {
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IntToGdbHex(reply, static_cast<u32>(Core::CPU().GetReg(static_cast<u64>(id))));
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if (id <= SP_REGISTER) {
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LongToGdbHex(reply, Core::CPU().GetReg(static_cast<int>(id)));
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} else if (id == PC_REGISTER) {
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LongToGdbHex(reply, Core::CPU().GetPC());
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} else if (id == CPSR_REGISTER) {
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IntToGdbHex(reply, Core::CPU().GetCPSR());
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} else if (id > CPSR_REGISTER && id < FPSCR_REGISTER) {
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IntToGdbHex(reply, Core::CPU().GetVFPReg(
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id - CPSR_REGISTER -
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1)); // VFP registers should start at 26, so one after CSPR_REGISTER
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} else if (id == FPSCR_REGISTER) {
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UNIMPLEMENTED();
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} else {
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return SendReply("E01");
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}
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@ -563,21 +615,19 @@ static void ReadRegisters() {
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u8* bufptr = buffer;
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for (int reg = 0; reg <= R15_REGISTER; reg++) {
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IntToGdbHex(bufptr + reg * CHAR_BIT, static_cast<u32>(Core::CPU().GetReg(reg)));
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for (int reg = 0; reg <= SP_REGISTER; reg++) {
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LongToGdbHex(bufptr + reg * 16, Core::CPU().GetReg(reg));
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}
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bufptr += (16 * CHAR_BIT);
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bufptr += (32 * 16);
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LongToGdbHex(bufptr, Core::CPU().GetPC());
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bufptr += 16;
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IntToGdbHex(bufptr, Core::CPU().GetCPSR());
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bufptr += CHAR_BIT;
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for (int reg = 0; reg <= 31; reg++) {
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IntToGdbHex(bufptr + reg * CHAR_BIT, Core::CPU().GetVFPReg(reg));
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}
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bufptr += (32 * CHAR_BIT);
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bufptr += 8;
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SendReply(reinterpret_cast<char*>(buffer));
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}
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@ -593,14 +643,12 @@ static void WriteRegister() {
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id |= HexCharToValue(command_buffer[2]);
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}
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if (id <= R15_REGISTER) {
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Core::CPU().SetReg(id, GdbHexToInt(buffer_ptr));
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if (id <= SP_REGISTER) {
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Core::CPU().SetReg(id, GdbHexToLong(buffer_ptr));
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} else if (id == PC_REGISTER) {
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Core::CPU().SetPC(GdbHexToLong(buffer_ptr));
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} else if (id == CPSR_REGISTER) {
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Core::CPU().SetCPSR(GdbHexToInt(buffer_ptr));
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} else if (id > CPSR_REGISTER && id < FPSCR_REGISTER) {
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Core::CPU().SetVFPReg(id - CPSR_REGISTER - 1, GdbHexToInt(buffer_ptr));
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} else if (id == FPSCR_REGISTER) {
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UNIMPLEMENTED();
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} else {
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return SendReply("E01");
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}
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@ -615,20 +663,14 @@ static void WriteRegisters() {
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if (command_buffer[0] != 'G')
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return SendReply("E01");
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for (int i = 0, reg = 0; reg <= FPSCR_REGISTER; i++, reg++) {
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if (reg <= R15_REGISTER) {
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Core::CPU().SetReg(reg, GdbHexToInt(buffer_ptr + i * CHAR_BIT));
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for (int i = 0, reg = 0; reg <= CPSR_REGISTER; i++, reg++) {
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if (reg <= SP_REGISTER) {
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Core::CPU().SetReg(reg, GdbHexToLong(buffer_ptr + i * 16));
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} else if (reg == PC_REGISTER) {
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Core::CPU().SetPC(GdbHexToLong(buffer_ptr + i * 16));
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} else if (reg == CPSR_REGISTER) {
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Core::CPU().SetCPSR(GdbHexToInt(buffer_ptr + i * CHAR_BIT));
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} else if (reg == CPSR_REGISTER - 1) {
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// Dummy FPA register, ignore
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} else if (reg < CPSR_REGISTER) {
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// Dummy FPA registers, ignore
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i += 2;
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} else if (reg > CPSR_REGISTER && reg < FPSCR_REGISTER) {
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Core::CPU().SetVFPReg(reg - CPSR_REGISTER - 1, GdbHexToInt(buffer_ptr + i * CHAR_BIT));
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i++; // Skip padding
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} else if (reg == FPSCR_REGISTER) {
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Core::CPU().SetCPSR(GdbHexToInt(buffer_ptr + i * 16));
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} else {
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UNIMPLEMENTED();
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}
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}
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@ -642,13 +684,13 @@ static void ReadMemory() {
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auto start_offset = command_buffer + 1;
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auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
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VAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
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VAddr addr = HexToLong(start_offset, static_cast<u64>(addr_pos - start_offset));
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start_offset = addr_pos + 1;
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u32 len =
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HexToInt(start_offset, static_cast<u32>((command_buffer + command_length) - start_offset));
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u64 len =
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HexToLong(start_offset, static_cast<u64>((command_buffer + command_length) - start_offset));
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LOG_DEBUG(Debug_GDBStub, "gdb: addr: %08x len: %08x\n", addr, len);
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LOG_DEBUG(Debug_GDBStub, "gdb: addr: %016llx len: %016llx\n", addr, len);
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if (len * 2 > sizeof(reply)) {
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SendReply("E01");
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@ -670,11 +712,11 @@ static void ReadMemory() {
|
|||
static void WriteMemory() {
|
||||
auto start_offset = command_buffer + 1;
|
||||
auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
|
||||
VAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
|
||||
VAddr addr = HexToLong(start_offset, static_cast<u64>(addr_pos - start_offset));
|
||||
|
||||
start_offset = addr_pos + 1;
|
||||
auto len_pos = std::find(start_offset, command_buffer + command_length, ':');
|
||||
u32 len = HexToInt(start_offset, static_cast<u32>(len_pos - start_offset));
|
||||
u64 len = HexToLong(start_offset, static_cast<u64>(len_pos - start_offset));
|
||||
|
||||
if (!Memory::IsValidVirtualAddress(addr)) {
|
||||
return SendReply("E00");
|
||||
|
|
@ -727,8 +769,8 @@ static void Continue() {
|
|||
* @param addr Address of breakpoint.
|
||||
* @param len Length of breakpoint.
|
||||
*/
|
||||
static bool CommitBreakpoint(BreakpointType type, PAddr addr, u32 len) {
|
||||
std::map<u32, Breakpoint>& p = GetBreakpointList(type);
|
||||
static bool CommitBreakpoint(BreakpointType type, PAddr addr, u64 len) {
|
||||
std::map<u64, Breakpoint>& p = GetBreakpointList(type);
|
||||
|
||||
Breakpoint breakpoint;
|
||||
breakpoint.active = true;
|
||||
|
|
@ -767,11 +809,11 @@ static void AddBreakpoint() {
|
|||
|
||||
auto start_offset = command_buffer + 3;
|
||||
auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
|
||||
PAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
|
||||
PAddr addr = HexToLong(start_offset, static_cast<u64>(addr_pos - start_offset));
|
||||
|
||||
start_offset = addr_pos + 1;
|
||||
u32 len =
|
||||
HexToInt(start_offset, static_cast<u32>((command_buffer + command_length) - start_offset));
|
||||
u64 len =
|
||||
HexToLong(start_offset, static_cast<u64>((command_buffer + command_length) - start_offset));
|
||||
|
||||
if (type == BreakpointType::Access) {
|
||||
// Access is made up of Read and Write types, so add both breakpoints
|
||||
|
|
@ -816,7 +858,7 @@ static void RemoveBreakpoint() {
|
|||
|
||||
auto start_offset = command_buffer + 3;
|
||||
auto addr_pos = std::find(start_offset, command_buffer + command_length, ',');
|
||||
PAddr addr = HexToInt(start_offset, static_cast<u32>(addr_pos - start_offset));
|
||||
PAddr addr = HexToLong(start_offset, static_cast<u64>(addr_pos - start_offset));
|
||||
|
||||
if (type == BreakpointType::Access) {
|
||||
// Access is made up of Read and Write types, so add both breakpoints
|
||||
|
|
|
|||
Loading…
Reference in a new issue