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thermosphere: rewrite gdb/reg

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This commit is contained in:
TuxSH 2020-01-25 22:55:38 +00:00
parent 97c4595a3a
commit 30a4a0d4c1
6 changed files with 170 additions and 105 deletions
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4
thermosphere/src/exceptions.h
View file

@ -135,7 +135,7 @@ static inline void writeFrameRegisterZ(ExceptionStackFrame *frame, u32 id, u64 v
}
}
static inline uintptr_t exceptionGetSp(const ExceptionStackFrame *frame)
static inline u64 *exceptionGetSpPtr(ExceptionStackFrame *frame)
{
// Note: the return value is more or less meaningless if we took an exception from A32...
// We try our best to reflect which privilege level the exception was took from, nonetheless
@ -149,7 +149,7 @@ static inline uintptr_t exceptionGetSp(const ExceptionStackFrame *frame)
spEl0 = el == 2 || el == 0 || (m & 1) == 0; // note: frame->sp_el2 is aliased to frame->sp_el0
}
return spEl0 ? frame->sp_el0 : frame->sp_el1;
return spEl0 ? &frame->sp_el0 : &frame->sp_el1;
}
bool spsrEvaluateConditionCode(u64 spsr, u32 conditionCode);

2
thermosphere/src/gdb/debug.c
View file

@ -173,7 +173,7 @@ static int GDB_ParseExceptionFrame(char *out, const DebugEventInfo *info, int si
n += sprintf(
out + n,
"1f:%016lx;20:%016lx;21:%08x",
__builtin_bswap64(exceptionGetSp(frame)),
__builtin_bswap64(*exceptionGetSpPtr(frame)),
__builitin_bswap32((u32)frame->spsr_el2)
);

4
thermosphere/src/gdb/net.c
View file

@ -23,7 +23,7 @@ u8 GDB_ComputeChecksum(const char *packetData, size_t len)
return (u8)cksum;
}
void GDB_EncodeHex(char *dst, const void *src, size_t len)
size_t GDB_EncodeHex(char *dst, const void *src, size_t len)
{
static const char *alphabet = "0123456789abcdef";
const u8 *src8 = (const u8 *)src;
@ -32,6 +32,8 @@ void GDB_EncodeHex(char *dst, const void *src, size_t len)
dst[2 * i] = alphabet[(src8[i] & 0xf0) >> 4];
dst[2 * i + 1] = alphabet[src8[i] & 0x0f];
}
return 2 * len;
}
static inline u32 GDB_DecodeHexDigit(char src, bool *ok)

2
thermosphere/src/gdb/net.h
View file

@ -12,7 +12,7 @@
#include <errno.h>
u8 GDB_ComputeChecksum(const char *packetData, size_t len);
void GDB_EncodeHex(char *dst, const void *src, size_t len);
size_t GDB_EncodeHex(char *dst, const void *src, size_t len);
size_t GDB_DecodeHex(void *dst, const char *src, size_t len);
size_t GDB_EscapeBinaryData(size_t *encodedCount, void *dst, const void *src, size_t len, size_t maxLen);
size_t GDB_UnescapeBinaryData(void *dst, const void *src, size_t len);

261
thermosphere/src/gdb/regs.c
View file

@ -5,149 +5,212 @@
* SPDX-License-Identifier: (MIT OR GPL-2.0-or-later)
*/
#include "gdb/regs.h"
#include "gdb/net.h"
#include <string.h>
#include <assert.h>
#include "../exceptions.h"
#include "../fpu.h"
#include "regs.h"
#include "net.h"
// GDB treats cpsr, fpsr, fpcr as 32-bit integers...
GDB_DECLARE_HANDLER(ReadRegisters)
{
if(ctx->selectedThreadId == 0)
ctx->selectedThreadId = ctx->currentThreadId;
ENSURE(ctx->selectedThreadId == currentCoreCtx->coreId);
ThreadContext regs;
Result r = svcGetDebugThreadContext(&regs, ctx->debug, ctx->selectedThreadId, THREADCONTEXT_CONTROL_ALL);
const ExceptionStackFrame *frame = currentCoreCtx->guestFrame;
const FpuRegisterCache *fpuRegCache = fpuReadRegisters();
if(R_FAILED(r))
return GDB_ReplyErrno(ctx, EPERM);
char *buf = ctx->buffer + 1;
size_t n = 0;
return GDB_SendHexPacket(ctx, &regs, sizeof(ThreadContext));
struct PACKED ALIGN(4) {
u64 sp;
u64 pc;
u32 cpsr;
} cpuSprs = {
.sp = *exceptionGetSpPtr(frame),
.pc = frame->elr_el2,
.cpsr = (u32)frame->spsr_el2,
};
static_assert(sizeof(cpuSprs) == 12, "sizeof(cpuSprs) != 12");
u32 fpuSprs[2] = {
(u32)fpuRegCache->fpsr,
(u32)fpuRegCache->fpcr,
};
n += GDB_EncodeHex(buf + n, frame->x, sizeof(frame->x));
n += GDB_EncodeHex(buf + n, &cpuSprs, sizeof(cpuSprs));
n += GDB_EncodeHex(buf + n, fpuRegCache->q, sizeof(fpuRegCache->q));
n += GDB_EncodeHex(buf + n, fpuSprs, sizeof(fpuSprs));
return GDB_SendPacket(ctx, buf, n);
}
GDB_DECLARE_HANDLER(WriteRegisters)
{
if(ctx->selectedThreadId == 0)
ctx->selectedThreadId = ctx->currentThreadId;
ENSURE(ctx->selectedThreadId == currentCoreCtx->coreId);
ThreadContext regs;
ExceptionStackFrame *frame = currentCoreCtx->guestFrame;
FpuRegisterCache *fpuRegCache = fpuGetRegisterCache();
if(GDB_DecodeHex(&regs, ctx->commandData, sizeof(ThreadContext)) != sizeof(ThreadContext))
return GDB_ReplyErrno(ctx, EPERM);
char *buf = ctx->commandData;
char *tmp = ctx->workBuffer;
Result r = svcSetDebugThreadContext(ctx->debug, ctx->selectedThreadId, &regs, THREADCONTEXT_CONTROL_ALL);
if(R_FAILED(r))
return GDB_ReplyErrno(ctx, EPERM);
else
return GDB_ReplyOk(ctx);
size_t n = 0;
size_t m = 0;
struct PACKED ALIGN(4) {
u64 sp;
u64 pc;
u32 cpsr;
} cpuSprs;
static_assert(sizeof(cpuSprs) == 12, "sizeof(cpuSprs) != 12");
u32 fpuSprs[2];
struct {
void *dst;
size_t sz;
} info[4] = {
{ frame->x, sizeof(frame->x) },
{ &cpuSprs, sizeof(cpuSprs) },
{ fpuRegCache->q, sizeof(fpuRegCache->q) },
{ fpuSprs, sizeof(fpuSprs) },
};
// Parse & return on error
for (u32 i = 0; i < 4; i++) {
if (GDB_DecodeHex(tmp + m, buf + n, info[i].sz) != info[i].sz) {
return GDB_ReplyErrno(ctx, EPERM);
}
n += 2 * info[i].sz;
m += info[i].sz;
}
// Copy. Note: we don't check if cpsr (spsr_el2) was modified to return to EL2...
m = 0;
for (u32 i = 0; i < 4; i++) {
memcpy(info[i].dst, tmp + m, info[i].sz);
m += info[i].sz;
}
*exceptionGetSpPtr(frame) = cpuSprs.sp;
frame->elr_el2 = cpuSprs.pc;
frame->spsr_el2 = cpuSprs.cpsr;
fpuRegCache->fpsr = fpuSprs[0];
fpuRegCache->fpcr = fpuSprs[1];
fpuCommitRegisters();
return GDB_ReplyOk(ctx);
}
static u32 GDB_ConvertRegisterNumber(ThreadContextControlFlags *flags, u32 gdbNum)
static void GDB_GetRegisterPointerAndSize(size_t *outSz, void **outPtr, unsigned long id, ExceptionStackFrame *frame, FpuRegisterCache *fpuRegCache)
{
if(gdbNum <= 15)
{
*flags = (gdbNum >= 13) ? THREADCONTEXT_CONTROL_CPU_SPRS : THREADCONTEXT_CONTROL_CPU_GPRS;
return gdbNum;
}
else if(gdbNum == 25)
{
*flags = THREADCONTEXT_CONTROL_CPU_SPRS;
return 16;
}
else if(gdbNum >= 26 && gdbNum <= 41)
{
*flags = THREADCONTEXT_CONTROL_FPU_GPRS;
return gdbNum - 26;
}
else if(gdbNum == 42 || gdbNum == 43)
{
*flags = THREADCONTEXT_CONTROL_FPU_SPRS;
return gdbNum - 42;
}
else
{
*flags = (ThreadContextControlFlags)0;
return 0;
switch (id) {
case 0 ... 30:
*outPtr = &frame->x[id];
*outSz = 8;
break;
case 31:
*outPtr = exceptionGetSpPtr(frame);
*outSz = 8;
break;
case 32:
*outPtr = &frame->spsr_el2;
*outSz = 4;
break;
case 33 ... 64:
*outPtr = &fpuRegCache->q[id - 33];
*outSz = 16;
case 65:
*outPtr = &fpuRegCache->fpsr;
*outSz = 4;
case 66:
*outPtr = &fpuRegCache->fpcr;
*outSz = 4;
default:
__builtin_unreachable();
return;
}
}
GDB_DECLARE_HANDLER(ReadRegister)
{
if(ctx->selectedThreadId == 0)
ctx->selectedThreadId = ctx->currentThreadId;
ENSURE(ctx->selectedThreadId == currentCoreCtx->coreId);
ThreadContext regs;
ThreadContextControlFlags flags;
u32 gdbRegNum;
const ExceptionStackFrame *frame = currentCoreCtx->guestFrame;
const FpuRegisterCache *fpuRegCache = NULL;
if(GDB_ParseHexIntegerList(&gdbRegNum, ctx->commandData, 1, 0) == NULL)
char *buf = ctx->buffer + 1;
unsigned long gdbRegNum;
if (GDB_ParseHexIntegerList(&gdbRegNum, ctx->commandData, 1, 0) == NULL) {
return GDB_ReplyErrno(ctx, EILSEQ);
}
u32 n = GDB_ConvertRegisterNumber(&flags, gdbRegNum);
if(!flags)
// Check the register number
if (gdbRegNum >= 31 + 3 + 32 + 2) {
return GDB_ReplyErrno(ctx, EINVAL);
}
Result r = svcGetDebugThreadContext(&regs, ctx->debug, ctx->selectedThreadId, flags);
if (gdbRegNum > 31 + 3) {
// FPU register -- must read the FPU registers first
fpuRegCache = fpuReadRegisters();
}
if(R_FAILED(r))
return GDB_ReplyErrno(ctx, EPERM);
size_t sz;
void *regPtr;
GDB_GetRegisterPointerAndSize(&sz, &regPtr, gdbRegNum, frame, fpuRegCache);
if(flags & THREADCONTEXT_CONTROL_CPU_GPRS)
return GDB_SendHexPacket(ctx, &regs.cpu_registers.r[n], 4);
else if(flags & THREADCONTEXT_CONTROL_CPU_SPRS)
return GDB_SendHexPacket(ctx, &regs.cpu_registers.sp + (n - 13), 4); // hacky
else if(flags & THREADCONTEXT_CONTROL_FPU_GPRS)
return GDB_SendHexPacket(ctx, &regs.fpu_registers.d[n], 8);
else
return GDB_SendHexPacket(ctx, &regs.fpu_registers.fpscr + n, 4); // hacky
return GDB_SendHexPacket(ctx, regPtr, sz);
}
GDB_DECLARE_HANDLER(WriteRegister)
{
if(ctx->selectedThreadId == 0)
ctx->selectedThreadId = ctx->currentThreadId;
ENSURE(ctx->selectedThreadId == currentCoreCtx->coreId);
ThreadContext regs;
ThreadContextControlFlags flags;
u32 gdbRegNum;
ExceptionStackFrame *frame = currentCoreCtx->guestFrame;
FpuRegisterCache *fpuRegCache = fpuGetRegisterCache();
char *tmp = ctx->workBuffer;
unsigned long gdbRegNum;
const char *valueStart = GDB_ParseHexIntegerList(&gdbRegNum, ctx->commandData, 1, '=');
if(valueStart == NULL || *valueStart != '=')
if(valueStart == NULL || *valueStart != '=') {
return GDB_ReplyErrno(ctx, EILSEQ);
}
valueStart++;
u32 n = GDB_ConvertRegisterNumber(&flags, gdbRegNum);
u32 value;
u64 value64;
if(flags & THREADCONTEXT_CONTROL_FPU_GPRS)
{
if(GDB_DecodeHex(&value64, valueStart, 8) != 8 || valueStart[16] != 0)
return GDB_ReplyErrno(ctx, EINVAL);
}
else if(flags)
{
if(GDB_DecodeHex(&value, valueStart, 4) != 4 || valueStart[8] != 0)
return GDB_ReplyErrno(ctx, EINVAL);
}
else
// Check the register number
if (gdbRegNum >= 31 + 3 + 32 + 2) {
return GDB_ReplyErrno(ctx, EINVAL);
}
Result r = svcGetDebugThreadContext(&regs, ctx->debug, ctx->selectedThreadId, flags);
size_t sz;
void *regPtr;
GDB_GetRegisterPointerAndSize(&sz, &regPtr, gdbRegNum, frame, fpuRegCache);
if(R_FAILED(r))
return GDB_ReplyErrno(ctx, EPERM);
// Check if we got 2 hex digits per byte
if (strlen(valueStart) != 2 * sz) {
return GDB_ReplyErrno(ctx, EILSEQ);
}
if(flags & THREADCONTEXT_CONTROL_CPU_GPRS)
regs.cpu_registers.r[n] = value;
else if(flags & THREADCONTEXT_CONTROL_CPU_SPRS)
*(&regs.cpu_registers.sp + (n - 13)) = value; // hacky
else if(flags & THREADCONTEXT_CONTROL_FPU_GPRS)
memcpy(&regs.fpu_registers.d[n], &value64, 8);
else
*(&regs.fpu_registers.fpscr + n) = value; // hacky
// Decode, check for errors
if (GDB_DecodeHex(tmp, valueStart, sz) != sz) {
return GDB_ReplyErrno(ctx, EILSEQ);
}
memcpy(regPtr, tmp, sz);
if (gdbRegNum > 31 + 3) {
// FPU register -- must commit the FPU registers
fpuCommitRegisters();
}
r = svcSetDebugThreadContext(ctx->debug, ctx->selectedThreadId, &regs, flags);
if(R_FAILED(r))
return GDB_ReplyErrno(ctx, EPERM);
else
return GDB_ReplyOk(ctx);
}

2
thermosphere/src/gdb/regs.h
View file

@ -7,7 +7,7 @@
#pragma once
#include "gdb.h"
#include "../gdb.h"
GDB_DECLARE_HANDLER(ReadRegisters);
GDB_DECLARE_HANDLER(WriteRegisters);