#include <algorithm>
#include <cassert>
+#include <cinttypes>
#include <cstdio>
#include <vector>
#include "sim.h"
#include "gdbserver.h"
#include "mmu.h"
-
-#define C_EBREAK 0x9002
-#define EBREAK 0x00100073
+#include "encoding.h"
//////////////////////////////////////// Utility Functions
REG_FPR0 = 33,
REG_FPR31 = 64,
REG_CSR0 = 65,
+ REG_MSTATUS = CSR_MSTATUS + REG_CSR0,
REG_CSR4095 = 4160,
REG_PRIV = 4161
};
MATCH_FSD;
}
-static uint32_t flw(unsigned int src, unsigned int base, uint16_t offset)
+static uint32_t flw(unsigned int dest, unsigned int base, uint16_t offset)
{
- return (bits(offset, 11, 5) << 25) |
- (bits(src, 4, 0) << 20) |
+ return (bits(offset, 11, 0) << 20) |
(base << 15) |
- (bits(offset, 4, 0) << 7) |
+ (bits(dest, 4, 0) << 7) |
MATCH_FLW;
}
-static uint32_t fld(unsigned int src, unsigned int base, uint16_t offset)
+static uint32_t fld(unsigned int dest, unsigned int base, uint16_t offset)
{
- return (bits(offset, 11, 5) << 25) |
- (bits(src, 4, 0) << 20) |
+ return (bits(offset, 11, 0) << 20) |
(base << 15) |
- (bits(offset, 4, 0) << 7) |
+ (bits(dest, 4, 0) << 7) |
MATCH_FLD;
}
bool perform_step(unsigned int step) {
switch (state) {
+ gs.tselect_valid = false;
case ST_ENTER:
if (gs.xlen == 0) {
gs.dr_write32(0, xori(S1, ZERO, -1));
case ST_MSTATUS:
gs.mstatus = gs.dr_read(SLOT_DATA0);
+ gs.mstatus_dirty = false;
gs.dr_write32(0, csrr(S0, CSR_DCSR));
gs.dr_write32(1, sw(S0, 0, (uint16_t) DEBUG_RAM_START + 16));
gs.dr_write_jump(2);
break;
}
}
+
return true;
default:
operation_t(gdbserver), single_step(single_step) {};
bool perform_step(unsigned int step) {
+ D(fprintf(stderr, "continue step %d\n", step));
switch (step) {
case 0:
gs.dr_write_load(0, S0, SLOT_DATA0);
switch (step) {
case 0:
if (reg >= REG_XPR0 && reg <= REG_XPR31) {
- die("handle_register_read");
- // send(p->state.XPR[reg - REG_XPR0]);
+ if (gs.xlen == 32) {
+ gs.dr_write32(0, sw(reg - REG_XPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ } else {
+ gs.dr_write32(0, sd(reg - REG_XPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ }
+ gs.dr_write_jump(1);
} else if (reg == REG_PC) {
gs.start_packet();
if (gs.xlen == 32) {
gs.end_packet();
return true;
} else if (reg >= REG_FPR0 && reg <= REG_FPR31) {
- // send(p->state.FPR[reg - REG_FPR0]);
+ gs.dr_write_load(0, S0, SLOT_DATA1);
+ gs.dr_write(SLOT_DATA1, set_field(gs.mstatus, MSTATUS_FS, 1));
+ gs.dr_write32(1, csrw(S0, CSR_MSTATUS));
+ gs.mstatus_dirty = true;
if (gs.xlen == 32) {
- gs.dr_write32(0, fsw(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ gs.dr_write32(2, fsw(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
} else {
- gs.dr_write32(0, fsd(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ gs.dr_write32(2, fsd(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
}
- gs.dr_write_jump(1);
+ gs.dr_write_jump(3);
+ } else if (reg == REG_MSTATUS) {
+ gs.start_packet();
+ if (gs.xlen == 32) {
+ gs.send((uint32_t) gs.mstatus);
+ } else {
+ gs.send(gs.mstatus);
+ }
+ gs.end_packet();
+ return true;
} else if (reg >= REG_CSR0 && reg <= REG_CSR4095) {
gs.dr_write32(0, csrr(S0, reg - REG_CSR0));
gs.dr_write_store(1, S0, SLOT_DATA0);
return false;
case 1:
- gs.start_packet();
- if (gs.xlen == 32) {
- gs.send(gs.dr_read32(4));
- } else {
- gs.send(gs.dr_read(SLOT_DATA0));
+ {
+ unsigned result = gs.dr_read(SLOT_DATA_LAST);
+ if (result) {
+ gs.send_packet("E03");
+ return true;
+ }
+ gs.start_packet();
+ if (gs.xlen == 32) {
+ gs.send(gs.dr_read32(4));
+ } else {
+ gs.send(gs.dr_read(SLOT_DATA0));
+ }
+ gs.end_packet();
+ return true;
}
- gs.end_packet();
- return true;
}
return false;
}
bool perform_step(unsigned int step)
{
- gs.dr_write_load(0, S0, SLOT_DATA0);
- gs.dr_write(SLOT_DATA0, value);
- if (reg == S0) {
- gs.dr_write32(1, csrw(S0, CSR_DSCRATCH));
- gs.dr_write_jump(2);
- } else if (reg == S1) {
- gs.dr_write_store(1, S0, SLOT_DATA_LAST);
- gs.dr_write_jump(2);
- } else if (reg >= REG_XPR0 && reg <= REG_XPR31) {
- gs.dr_write32(1, addi(reg, S0, 0));
- gs.dr_write_jump(2);
- } else if (reg == REG_PC) {
- gs.dpc = value;
- return true;
- } else if (reg >= REG_FPR0 && reg <= REG_FPR31) {
- if (gs.xlen == 32) {
- gs.dr_write32(0, flw(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
- } else {
- gs.dr_write32(0, fld(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
- }
- gs.dr_write_jump(1);
- } else if (reg >= REG_CSR0 && reg <= REG_CSR4095) {
- gs.dr_write32(1, csrw(S0, reg - REG_CSR0));
- gs.dr_write_jump(2);
- if (reg == REG_CSR0 + CSR_SPTBR) {
- gs.sptbr = value;
- gs.sptbr_valid = true;
- }
- } else if (reg == REG_PRIV) {
- gs.dcsr = set_field(gs.dcsr, DCSR_PRV, value);
- return true;
- } else {
- gs.send_packet("E02");
- return true;
+ switch (step) {
+ case 0:
+ gs.dr_write_load(0, S0, SLOT_DATA0);
+ gs.dr_write(SLOT_DATA0, value);
+ if (reg == S0) {
+ gs.dr_write32(1, csrw(S0, CSR_DSCRATCH));
+ gs.dr_write_jump(2);
+ } else if (reg == S1) {
+ gs.dr_write_store(1, S0, SLOT_DATA_LAST);
+ gs.dr_write_jump(2);
+ } else if (reg >= REG_XPR0 && reg <= REG_XPR31) {
+ gs.dr_write32(1, addi(reg, S0, 0));
+ gs.dr_write_jump(2);
+ } else if (reg == REG_PC) {
+ gs.dpc = value;
+ return true;
+ } else if (reg >= REG_FPR0 && reg <= REG_FPR31) {
+ gs.dr_write_load(0, S0, SLOT_DATA1);
+ gs.dr_write(SLOT_DATA1, set_field(gs.mstatus, MSTATUS_FS, 1));
+ gs.dr_write32(1, csrw(S0, CSR_MSTATUS));
+ gs.mstatus_dirty = true;
+ if (gs.xlen == 32) {
+ gs.dr_write32(2, flw(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ } else {
+ gs.dr_write32(2, fld(reg - REG_FPR0, 0, (uint16_t) DEBUG_RAM_START + 16));
+ }
+ gs.dr_write_jump(3);
+ } else if (reg == REG_MSTATUS) {
+ gs.mstatus = value;
+ gs.mstatus_dirty = true;
+ return true;
+ } else if (reg >= REG_CSR0 && reg <= REG_CSR4095) {
+ gs.dr_write32(1, csrw(S0, reg - REG_CSR0));
+ gs.dr_write_jump(2);
+ if (reg == REG_CSR0 + CSR_SPTBR) {
+ gs.sptbr = value;
+ gs.sptbr_valid = true;
+ }
+ } else if (reg == REG_PRIV) {
+ gs.dcsr = set_field(gs.dcsr, DCSR_PRV, value);
+ return true;
+ } else {
+ gs.send_packet("E02");
+ return true;
+ }
+ gs.set_interrupt(0);
+ return false;
+
+ case 1:
+ {
+ unsigned result = gs.dr_read(SLOT_DATA_LAST);
+ if (result) {
+ gs.send_packet("E03");
+ return true;
+ }
+ gs.send_packet("OK");
+ return true;
+ }
}
- gs.set_interrupt(0);
- gs.send_packet("OK");
- return true;
+
+ assert(0);
}
private:
// If data is NULL, send the result straight to gdb.
memory_read_op_t(gdbserver_t& gdbserver, reg_t vaddr, unsigned int length,
unsigned char *data=NULL) :
- operation_t(gdbserver), vaddr(vaddr), length(length), data(data) {};
+ operation_t(gdbserver), vaddr(vaddr), length(length), data(data), index(0)
+ {
+ buf = new uint8_t[length];
+ };
+
+ ~memory_read_op_t()
+ {
+ delete[] buf;
+ }
bool perform_step(unsigned int step)
{
gs.dr_write(SLOT_DATA0, paddr);
gs.set_interrupt(0);
- if (!data) {
- gs.start_packet();
- }
return false;
}
- char buffer[3];
+ if (gs.dr_read32(DEBUG_RAM_SIZE / 4 - 1)) {
+ // Note that OpenOCD doesn't report this error to gdb by default. They
+ // think it can mess up stack tracing. So far I haven't seen any
+ // problems.
+ gs.send_packet("E99");
+ return true;
+ }
+
reg_t value = gs.dr_read(SLOT_DATA1);
for (unsigned int i = 0; i < access_size; i++) {
if (data) {
*(data++) = value & 0xff;
D(fprintf(stderr, "%02x", (unsigned int) (value & 0xff)));
} else {
- sprintf(buffer, "%02x", (unsigned int) (value & 0xff));
- gs.send(buffer);
+ buf[index++] = value & 0xff;
}
value >>= 8;
}
if (length == 0) {
if (!data) {
+ gs.start_packet();
+ char buffer[3];
+ for (unsigned int i = 0; i < index; i++) {
+ sprintf(buffer, "%02x", (unsigned int) buf[i]);
+ gs.send(buffer);
+ }
gs.end_packet();
}
return true;
unsigned char* data;
reg_t paddr;
unsigned int access_size;
+ unsigned int index;
+ uint8_t *buf;
};
class memory_write_op_t : public operation_t
access_size = gs.find_access_size(paddr, length);
D(fprintf(stderr, "write to 0x%lx -> 0x%lx (access=%d): ", vaddr, paddr,
- access_size));
+ access_size));
for (unsigned int i = 0; i < length; i++) {
D(fprintf(stderr, "%02x", data[i]));
}
(data[6] << 16) | (data[7] << 24));
break;
default:
- fprintf(stderr, "gdbserver error: write %d bytes to 0x%lx -> 0x%lx; "
- "access_size=%d\n", length, vaddr, paddr, access_size);
+ fprintf(stderr, "gdbserver error: write %d bytes to 0x%016" PRIx64
+ " -> 0x%016" PRIx64 "; access_size=%d\n",
+ length, vaddr, paddr, access_size);
gs.send_packet("E12");
return true;
}
}
if (gs.dr_read32(DEBUG_RAM_SIZE / 4 - 1)) {
- fprintf(stderr, "Exception happened while writing to 0x%lx -> 0x%lx\n",
- vaddr, paddr);
+ gs.send_packet("E98");
+ return true;
}
offset += access_size;
gs.dr_write32(1, ld(S1, S0, 0));
gs.dr_write32(2, sd(S1, 0, (uint16_t) DEBUG_RAM_START + 16));
}
- gs.dr_write32(3, jal(0, (uint32_t) (DEBUG_ROM_RESUME - (DEBUG_RAM_START + 4*3))));
+ gs.dr_write_jump(3);
gs.dr_write32(4, pte_addr);
gs.dr_write32(5, pte_addr >> 32);
gs.set_interrupt(0);
}
}
fprintf(stderr,
- "ERROR: gdbserver couldn't find appropriate PTEs to translate 0x%lx\n",
+ "ERROR: gdbserver couldn't find appropriate PTEs to translate 0x%016" PRIx64 "\n",
vaddr);
return true;
}
gs.dr_write32(1, csrw(S0, CSR_TDATA1));
gs.dr_write_jump(2);
mcontrol = set_field(0, MCONTROL_ACTION, MCONTROL_ACTION_DEBUG_MODE);
+ mcontrol = set_field(mcontrol, MCONTROL_DMODE(gs.xlen), 1);
mcontrol = set_field(mcontrol, MCONTROL_MATCH, MCONTROL_MATCH_EQUAL);
mcontrol = set_field(mcontrol, MCONTROL_M, 1);
mcontrol = set_field(mcontrol, MCONTROL_H, 1);
mcontrol = set_field(mcontrol, MCONTROL_EXECUTE, bp.execute);
mcontrol = set_field(mcontrol, MCONTROL_LOAD, bp.load);
mcontrol = set_field(mcontrol, MCONTROL_STORE, bp.store);
+ // For store triggers it's nicer to fire just before the
+ // instruction than just after. However, gdb doesn't clear the
+ // breakpoints and step before resuming from a store trigger.
+ // That means that without extra code, you'll keep hitting the
+ // same watchpoint over and over again. That's not useful at all.
+ // Instead of fixing this the right way, just set timing=1 for
+ // those triggers.
+ if (bp.load || bp.store)
+ mcontrol = set_field(mcontrol, MCONTROL_TIMING, 1);
+
gs.dr_write(SLOT_DATA1, mcontrol);
state = STATE_WRITE_ADDRESS;
} else {
hardware_breakpoint_t bp;
};
+class maybe_save_tselect_op_t : public operation_t
+{
+ public:
+ maybe_save_tselect_op_t(gdbserver_t& gdbserver) : operation_t(gdbserver) {};
+ bool perform_step(unsigned int step) {
+ if (gs.tselect_valid)
+ return true;
+
+ switch (step) {
+ case 0:
+ gs.dr_write32(0, csrr(S0, CSR_TDATA1));
+ gs.dr_write_store(1, S0, SLOT_DATA0);
+ gs.dr_write_jump(2);
+ gs.set_interrupt(0);
+ return false;
+ case 1:
+ gs.tselect = gs.dr_read(SLOT_DATA0);
+ gs.tselect_valid = true;
+ break;
+ }
+ return true;
+ }
+};
+
+class maybe_restore_tselect_op_t : public operation_t
+{
+ public:
+ maybe_restore_tselect_op_t(gdbserver_t& gdbserver) : operation_t(gdbserver) {};
+ bool perform_step(unsigned int step) {
+ if (gs.tselect_valid) {
+ gs.dr_write_load(0, S0, SLOT_DATA1);
+ gs.dr_write32(1, csrw(S0, CSR_TSELECT));
+ gs.dr_write_jump(2);
+ gs.dr_write(SLOT_DATA1, gs.tselect);
+ }
+ return true;
+ }
+};
+
+class maybe_restore_mstatus_op_t : public operation_t
+{
+ public:
+ maybe_restore_mstatus_op_t(gdbserver_t& gdbserver) : operation_t(gdbserver) {};
+ bool perform_step(unsigned int step) {
+ if (gs.mstatus_dirty) {
+ gs.dr_write_load(0, S0, SLOT_DATA1);
+ gs.dr_write32(1, csrw(S0, CSR_MSTATUS));
+ gs.dr_write_jump(2);
+ gs.dr_write(SLOT_DATA1, gs.mstatus);
+ }
+ return true;
+ }
+};
+
class hardware_breakpoint_remove_op_t : public operation_t
{
public:
xlen(0),
sim(sim),
client_fd(0),
- recv_buf(64 * 1024), send_buf(64 * 1024)
+ // gdb likes to send 0x100000 bytes at once when downloading.
+ recv_buf(0x180000), send_buf(64 * 1024)
{
socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if (socket_fd == -1) {
reg_t pte_addr = base + idx * ptesize;
auto it = pte_cache.find(pte_addr);
if (it == pte_cache.end()) {
- fprintf(stderr, "ERROR: gdbserver tried to translate 0x%lx without first "
- "collecting the relevant PTEs.\n", vaddr);
+ fprintf(stderr, "ERROR: gdbserver tried to translate 0x%016" PRIx64
+ " without first collecting the relevant PTEs.\n", vaddr);
die("gdbserver_t::translate()");
}
}
}
- fprintf(stderr, "ERROR: gdbserver tried to translate 0x%lx but the relevant "
- "PTEs are invalid.\n", vaddr);
+ fprintf(stderr, "ERROR: gdbserver tried to translate 0x%016" PRIx64
+ " but the relevant PTEs are invalid.\n", vaddr);
// TODO: Is it better to throw an exception here?
return -1;
}
// available.
size_t count = recv_buf.contiguous_empty_size();
- assert(count > 0);
ssize_t bytes = ::read(client_fd, recv_buf.contiguous_empty(), count);
if (bytes == -1) {
if (errno == EAGAIN) {
break;
}
}
+
+ if (recv_buf.full()) {
+ fprintf(stderr,
+ "Receive buffer is full, but no complete packet was found!\n");
+ for (unsigned line = 0; line < 8; line++) {
+ for (unsigned i = 0; i < 16; i++) {
+ fprintf(stderr, "%02x ", recv_buf.entry(line * 16 + i));
+ }
+ for (unsigned i = 0; i < 16; i++) {
+ uint8_t e = recv_buf.entry(line * 16 + i);
+ if (e >= ' ' && e <= '~')
+ fprintf(stderr, "%c", e);
+ else
+ fprintf(stderr, ".");
+ }
+ fprintf(stderr, "\n");
+ }
+ assert(!recv_buf.full());
+ }
}
void gdbserver_t::handle_halt_reason(const std::vector<uint8_t> &packet)
// First byte is the least-significant one.
// Eg. "08675309" becomes 0x09536708
-uint64_t consume_hex_number_le(std::vector<uint8_t>::const_iterator &iter,
+uint64_t gdbserver_t::consume_hex_number_le(
+ std::vector<uint8_t>::const_iterator &iter,
std::vector<uint8_t>::const_iterator end)
{
uint64_t value = 0;
else
shift -= 4;
}
+ if (shift > (xlen+4)) {
+ fprintf(stderr,
+ "gdb sent too many data bytes. That means it thinks XLEN is greater "
+ "than %d.\nTo fix that, tell gdb: set arch riscv:rv%d\n",
+ xlen, xlen);
+ }
return value;
}
return send_packet("E30");
}
+ add_operation(new maybe_restore_tselect_op_t(*this));
+ add_operation(new maybe_restore_mstatus_op_t(*this));
add_operation(new continue_op_t(*this, false));
}
return send_packet("E40");
}
+ add_operation(new maybe_restore_tselect_op_t(*this));
add_operation(new continue_op_t(*this, true));
}
add_operation(new collect_translation_info_op_t(*this, vaddr, size));
unsigned char* inst = new unsigned char[4];
if (size == 2) {
- inst[0] = C_EBREAK & 0xff;
- inst[1] = (C_EBREAK >> 8) & 0xff;
+ inst[0] = MATCH_C_EBREAK & 0xff;
+ inst[1] = (MATCH_C_EBREAK >> 8) & 0xff;
} else {
- inst[0] = EBREAK & 0xff;
- inst[1] = (EBREAK >> 8) & 0xff;
- inst[2] = (EBREAK >> 16) & 0xff;
- inst[3] = (EBREAK >> 24) & 0xff;
+ inst[0] = MATCH_EBREAK & 0xff;
+ inst[1] = (MATCH_EBREAK >> 8) & 0xff;
+ inst[2] = (MATCH_EBREAK >> 16) & 0xff;
+ inst[3] = (MATCH_EBREAK >> 24) & 0xff;
}
software_breakpoint_t bp = {
void gdbserver_t::hardware_breakpoint_insert(const hardware_breakpoint_t &bp)
{
+ add_operation(new maybe_save_tselect_op_t(*this));
add_operation(new hardware_breakpoint_insert_op_t(*this, bp));
}
void gdbserver_t::hardware_breakpoint_remove(const hardware_breakpoint_t &bp)
{
+ add_operation(new maybe_save_tselect_op_t(*this));
hardware_breakpoint_t found = *hardware_breakpoints.find(bp);
add_operation(new hardware_breakpoint_remove_op_t(*this, found));
}
projects / riscv-isa-sim.git / blobdiff