6 #include <sys/socket.h>
17 #include "gdbserver.h"
20 #define C_EBREAK 0x9002
21 #define EBREAK 0x00100073
23 //////////////////////////////////////// Utility Functions
25 void die(const char* msg
)
27 fprintf(stderr
, "gdbserver code died: %s\n", msg
);
31 // gdb's register list is defined in riscv_gdb_reg_names gdb/riscv-tdep.c in
32 // its source tree. We must interpret the numbers the same here.
44 //////////////////////////////////////// Functions to generate RISC-V opcodes.
46 // TODO: Does this already exist somewhere?
48 // Using regnames.cc as source. The RVG Calling Convention of the 2.0 RISC-V
49 // spec says it should be 2 and 3.
52 static uint32_t bits(uint32_t value
, unsigned int hi
, unsigned int lo
) {
53 return (value
>> lo
) & ((1 << (hi
+1-lo
)) - 1);
56 static uint32_t bit(uint32_t value
, unsigned int b
) {
57 return (value
>> b
) & 1;
60 static uint32_t jal(unsigned int rd
, uint32_t imm
) {
61 return (bit(imm
, 20) << 31) |
62 (bits(imm
, 10, 1) << 21) |
63 (bit(imm
, 11) << 20) |
64 (bits(imm
, 19, 12) << 12) |
69 static uint32_t csrsi(unsigned int csr
, uint8_t imm
) {
71 (bits(imm
, 4, 0) << 15) |
75 static uint32_t csrci(unsigned int csr
, uint8_t imm
) {
77 (bits(imm
, 4, 0) << 15) |
81 static uint32_t csrr(unsigned int rd
, unsigned int csr
) {
82 return (csr
<< 20) | (rd
<< 7) | MATCH_CSRRS
;
85 static uint32_t csrw(unsigned int source
, unsigned int csr
) {
86 return (csr
<< 20) | (source
<< 15) | MATCH_CSRRW
;
89 static uint32_t sw(unsigned int src
, unsigned int base
, uint16_t offset
)
91 return (bits(offset
, 11, 5) << 25) |
94 (bits(offset
, 4, 0) << 7) |
98 static uint32_t sd(unsigned int src
, unsigned int base
, uint16_t offset
)
100 return (bits(offset
, 11, 5) << 25) |
101 (bits(src
, 4, 0) << 20) |
103 (bits(offset
, 4, 0) << 7) |
107 static uint32_t ld(unsigned int rd
, unsigned int base
, uint16_t offset
)
109 return (bits(offset
, 11, 0) << 20) |
111 (bits(rd
, 4, 0) << 7) |
115 static uint32_t lw(unsigned int rd
, unsigned int base
, uint16_t offset
)
117 return (bits(offset
, 11, 0) << 20) |
119 (bits(rd
, 4, 0) << 7) |
123 static uint32_t lh(unsigned int rd
, unsigned int base
, uint16_t offset
)
125 return (bits(offset
, 11, 0) << 20) |
127 (bits(rd
, 4, 0) << 7) |
131 static uint32_t lb(unsigned int rd
, unsigned int base
, uint16_t offset
)
133 return (bits(offset
, 11, 0) << 20) |
135 (bits(rd
, 4, 0) << 7) |
139 static uint32_t fsd(unsigned int src
, unsigned int base
, uint16_t offset
)
141 return (bits(offset
, 11, 5) << 25) |
142 (bits(src
, 4, 0) << 20) |
144 (bits(offset
, 4, 0) << 7) |
148 static uint32_t addi(unsigned int dest
, unsigned int src
, uint16_t imm
)
150 return (bits(imm
, 11, 0) << 20) |
156 static uint32_t nop()
158 return addi(0, 0, 0);
161 template <typename T
>
162 unsigned int circular_buffer_t
<T
>::size() const
167 return end
+ capacity
- start
;
170 template <typename T
>
171 void circular_buffer_t
<T
>::consume(unsigned int bytes
)
173 start
= (start
+ bytes
) % capacity
;
176 template <typename T
>
177 unsigned int circular_buffer_t
<T
>::contiguous_empty_size() const
181 return capacity
- end
- 1;
183 return capacity
- end
;
185 return start
- end
- 1;
188 template <typename T
>
189 unsigned int circular_buffer_t
<T
>::contiguous_data_size() const
194 return capacity
- start
;
197 template <typename T
>
198 void circular_buffer_t
<T
>::data_added(unsigned int bytes
)
201 assert(end
<= capacity
);
206 template <typename T
>
207 void circular_buffer_t
<T
>::reset()
213 template <typename T
>
214 void circular_buffer_t
<T
>::append(const T
*src
, unsigned int count
)
216 unsigned int copy
= std::min(count
, contiguous_empty_size());
217 memcpy(contiguous_empty(), src
, copy
* sizeof(T
));
221 assert(count
< contiguous_empty_size());
222 memcpy(contiguous_empty(), src
, count
* sizeof(T
));
227 ////////////////////////////// Debug Operations
229 class halt_op_t
: public operation_t
232 halt_op_t(gdbserver_t
& gdbserver
) : operation_t(gdbserver
) {};
236 // TODO: For now we just assume the target is 64-bit.
237 gs
.write_debug_ram(0, csrsi(DCSR_ADDRESS
, DCSR_HALT_MASK
));
238 gs
.write_debug_ram(1, csrr(S0
, DPC_ADDRESS
));
239 gs
.write_debug_ram(2, sd(S0
, 0, (uint16_t) DEBUG_RAM_START
));
240 gs
.write_debug_ram(3, csrr(S0
, CSR_MBADADDR
));
241 gs
.write_debug_ram(4, sd(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 8));
242 gs
.write_debug_ram(5, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*5))));
244 // We could read mcause here as well, but only on 64-bit targets. I'm
245 // trying to keep The patterns here usable for 32-bit ISAs as well. (On a
246 // 32-bit ISA 8 words are required, while the minimum Debug RAM size is 7
254 if (state
== READ_DPC
) {
255 gs
.saved_dpc
= ((uint64_t) gs
.read_debug_ram(1) << 32) | gs
.read_debug_ram(0);
256 gs
.saved_mbadaddr
= ((uint64_t) gs
.read_debug_ram(3) << 32) | gs
.read_debug_ram(2);
257 gs
.write_debug_ram(0, csrr(S0
, CSR_MCAUSE
));
258 gs
.write_debug_ram(1, sd(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
259 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
264 gs
.saved_mcause
= ((uint64_t) gs
.read_debug_ram(1) << 32) | gs
.read_debug_ram(0);
276 class continue_op_t
: public operation_t
279 continue_op_t(gdbserver_t
& gdbserver
) : operation_t(gdbserver
) {};
283 gs
.write_debug_ram(0, ld(S0
, 0, (uint16_t) DEBUG_RAM_START
+16));
284 gs
.write_debug_ram(1, csrw(S0
, DPC_ADDRESS
));
285 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
286 gs
.write_debug_ram(4, gs
.saved_dpc
);
287 gs
.write_debug_ram(5, gs
.saved_dpc
>> 32);
295 if (state
== WRITE_DPC
) {
296 gs
.write_debug_ram(0, ld(S0
, 0, (uint16_t) DEBUG_RAM_START
+16));
297 gs
.write_debug_ram(1, csrw(S0
, CSR_MBADADDR
));
298 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
299 gs
.write_debug_ram(4, gs
.saved_mbadaddr
);
300 gs
.write_debug_ram(5, gs
.saved_mbadaddr
>> 32);
302 state
= WRITE_MBADADDR
;
305 gs
.write_debug_ram(0, ld(S0
, 0, (uint16_t) DEBUG_RAM_START
+16));
306 gs
.write_debug_ram(1, csrw(S0
, CSR_MCAUSE
));
307 gs
.write_debug_ram(2, csrci(DCSR_ADDRESS
, DCSR_HALT_MASK
));
308 gs
.write_debug_ram(3, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*3))));
309 gs
.write_debug_ram(4, gs
.saved_mcause
);
310 gs
.write_debug_ram(5, gs
.saved_mcause
>> 32);
323 class general_registers_read_op_t
: public operation_t
325 // Register order that gdb expects is:
326 // "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
327 // "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
328 // "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
329 // "x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31",
331 // Each byte of register data is described by two hex digits. The bytes with
332 // the register are transmitted in target byte order. The size of each
333 // register and their position within the ‘g’ packet are determined by the
334 // gdb internal gdbarch functions DEPRECATED_REGISTER_RAW_SIZE and
335 // gdbarch_register_name.
338 general_registers_read_op_t(gdbserver_t
& gdbserver
) :
339 operation_t(gdbserver
), current_reg(0) {};
345 // x0 is always zero.
348 gs
.write_debug_ram(0, sd(1, 0, (uint16_t) DEBUG_RAM_START
+ 16));
349 gs
.write_debug_ram(1, sd(2, 0, (uint16_t) DEBUG_RAM_START
+ 0));
350 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
358 fprintf(stderr
, "step %d\n", current_reg
);
359 gs
.send(((uint64_t) gs
.read_debug_ram(5) << 32) | gs
.read_debug_ram(4));
360 if (current_reg
>= 31) {
365 gs
.send(((uint64_t) gs
.read_debug_ram(1) << 32) | gs
.read_debug_ram(0));
368 // TODO properly read s0 and s1
369 gs
.write_debug_ram(0, sd(current_reg
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
370 gs
.write_debug_ram(1, sd(current_reg
+1, 0, (uint16_t) DEBUG_RAM_START
+ 0));
371 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
378 unsigned int current_reg
;
381 class register_read_op_t
: public operation_t
384 register_read_op_t(gdbserver_t
& gdbserver
, unsigned int reg
) :
385 operation_t(gdbserver
), reg(reg
) {};
389 if (reg
>= REG_XPR0
&& reg
<= REG_XPR31
) {
390 die("handle_register_read");
391 // send(p->state.XPR[reg - REG_XPR0]);
392 } else if (reg
== REG_PC
) {
394 gs
.send(gs
.saved_dpc
);
397 } else if (reg
>= REG_FPR0
&& reg
<= REG_FPR31
) {
398 // send(p->state.FPR[reg - REG_FPR0]);
399 gs
.write_debug_ram(0, fsd(reg
- REG_FPR0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
400 gs
.write_debug_ram(1, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*1))));
401 } else if (reg
== REG_CSR0
+ CSR_MBADADDR
) {
403 gs
.send(gs
.saved_mbadaddr
);
406 } else if (reg
== REG_CSR0
+ CSR_MCAUSE
) {
408 gs
.send(gs
.saved_mcause
);
411 } else if (reg
>= REG_CSR0
&& reg
<= REG_CSR4095
) {
412 gs
.write_debug_ram(0, csrr(S0
, reg
- REG_CSR0
));
413 gs
.write_debug_ram(1, sd(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
414 gs
.write_debug_ram(2, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*2))));
415 // If we hit an exception reading the CSR, we'll end up returning ~0 as
416 // the register's value, which is what we want. (Right?)
417 gs
.write_debug_ram(4, 0xffffffff);
418 gs
.write_debug_ram(5, 0xffffffff);
420 gs
.send_packet("E02");
432 gs
.send(((uint64_t) gs
.read_debug_ram(5) << 32) | gs
.read_debug_ram(4));
441 class memory_read_op_t
: public operation_t
444 memory_read_op_t(gdbserver_t
& gdbserver
, reg_t addr
, unsigned int length
) :
445 operation_t(gdbserver
), addr(addr
), length(length
) {};
449 // address goes in S0
450 access_size
= (addr
% length
);
451 if (access_size
== 0)
452 access_size
= length
;
454 gs
.write_debug_ram(0, ld(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
455 switch (access_size
) {
457 gs
.write_debug_ram(1, lb(S1
, S0
, 0));
460 gs
.write_debug_ram(1, lh(S1
, S0
, 0));
463 gs
.write_debug_ram(1, lw(S1
, S0
, 0));
466 gs
.write_debug_ram(1, ld(S1
, S0
, 0));
469 gs
.send_packet("E12");
472 gs
.write_debug_ram(2, sd(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 24));
473 gs
.write_debug_ram(3, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*3))));
474 gs
.write_debug_ram(4, addr
);
475 gs
.write_debug_ram(5, addr
>> 32);
486 reg_t value
= ((uint64_t) gs
.read_debug_ram(7) << 32) | gs
.read_debug_ram(6);
487 for (unsigned int i
= 0; i
< access_size
; i
++) {
488 sprintf(buffer
, "%02x", (unsigned int) (value
& 0xff));
492 length
-= access_size
;
499 gs
.write_debug_ram(4, addr
);
500 gs
.write_debug_ram(5, addr
>> 32);
509 unsigned int access_size
;
512 ////////////////////////////// gdbserver itself
514 gdbserver_t::gdbserver_t(uint16_t port
, sim_t
*sim
) :
517 recv_buf(64 * 1024), send_buf(64 * 1024),
520 socket_fd
= socket(AF_INET
, SOCK_STREAM
, 0);
521 if (socket_fd
== -1) {
522 fprintf(stderr
, "failed to make socket: %s (%d)\n", strerror(errno
), errno
);
526 fcntl(socket_fd
, F_SETFL
, O_NONBLOCK
);
528 if (setsockopt(socket_fd
, SOL_SOCKET
, SO_REUSEADDR
, &reuseaddr
,
529 sizeof(int)) == -1) {
530 fprintf(stderr
, "failed setsockopt: %s (%d)\n", strerror(errno
), errno
);
534 struct sockaddr_in addr
;
535 memset(&addr
, 0, sizeof(addr
));
536 addr
.sin_family
= AF_INET
;
537 addr
.sin_addr
.s_addr
= INADDR_ANY
;
538 addr
.sin_port
= htons(port
);
540 if (bind(socket_fd
, (struct sockaddr
*) &addr
, sizeof(addr
)) == -1) {
541 fprintf(stderr
, "failed to bind socket: %s (%d)\n", strerror(errno
), errno
);
545 if (listen(socket_fd
, 1) == -1) {
546 fprintf(stderr
, "failed to listen on socket: %s (%d)\n", strerror(errno
), errno
);
551 void gdbserver_t::write_debug_ram(unsigned int index
, uint32_t value
)
553 sim
->debug_module
.ram_write32(index
, value
);
556 uint32_t gdbserver_t::read_debug_ram(unsigned int index
)
558 return sim
->debug_module
.ram_read32(index
);
561 void gdbserver_t::set_operation(operation_t
* operation
)
563 assert(this->operation
== NULL
|| operation
== NULL
);
564 if (operation
&& operation
->start()) {
567 this->operation
= operation
;
571 void gdbserver_t::accept()
573 client_fd
= ::accept(socket_fd
, NULL
, NULL
);
574 if (client_fd
== -1) {
575 if (errno
== EAGAIN
) {
576 // No client waiting to connect right now.
578 fprintf(stderr
, "failed to accept on socket: %s (%d)\n", strerror(errno
),
583 fcntl(client_fd
, F_SETFL
, O_NONBLOCK
);
586 extended_mode
= false;
588 // gdb wants the core to be halted when it attaches.
589 set_operation(new halt_op_t(*this));
593 void gdbserver_t::read()
595 // Reading from a non-blocking socket still blocks if there is no data
598 size_t count
= recv_buf
.contiguous_empty_size();
600 ssize_t bytes
= ::read(client_fd
, recv_buf
.contiguous_empty(), count
);
602 if (errno
== EAGAIN
) {
603 // We'll try again the next call.
605 fprintf(stderr
, "failed to read on socket: %s (%d)\n", strerror(errno
), errno
);
608 } else if (bytes
== 0) {
609 // The remote disconnected.
611 processor_t
*p
= sim
->get_core(0);
612 // TODO p->set_halted(false, HR_NONE);
616 recv_buf
.data_added(bytes
);
620 void gdbserver_t::write()
622 if (send_buf
.empty())
625 while (!send_buf
.empty()) {
626 unsigned int count
= send_buf
.contiguous_data_size();
628 ssize_t bytes
= ::write(client_fd
, send_buf
.contiguous_data(), count
);
630 fprintf(stderr
, "failed to write to socket: %s (%d)\n", strerror(errno
), errno
);
632 } else if (bytes
== 0) {
633 // Client can't take any more data right now.
636 fprintf(stderr
, "wrote %ld bytes: ", bytes
);
637 for (unsigned int i
= 0; i
< bytes
; i
++) {
638 fprintf(stderr
, "%c", send_buf
[i
]);
640 fprintf(stderr
, "\n");
641 send_buf
.consume(bytes
);
646 void print_packet(const std::vector
<uint8_t> &packet
)
648 for (uint8_t c
: packet
) {
649 if (c
>= ' ' and c
<= '~')
650 fprintf(stderr
, "%c", c
);
652 fprintf(stderr
, "\\x%x", c
);
654 fprintf(stderr
, "\n");
657 uint8_t compute_checksum(const std::vector
<uint8_t> &packet
)
659 uint8_t checksum
= 0;
660 for (auto i
= packet
.begin() + 1; i
!= packet
.end() - 3; i
++ ) {
666 uint8_t character_hex_value(uint8_t character
)
668 if (character
>= '0' && character
<= '9')
669 return character
- '0';
670 if (character
>= 'a' && character
<= 'f')
671 return 10 + character
- 'a';
672 if (character
>= 'A' && character
<= 'F')
673 return 10 + character
- 'A';
677 uint8_t extract_checksum(const std::vector
<uint8_t> &packet
)
679 return character_hex_value(*(packet
.end() - 1)) +
680 16 * character_hex_value(*(packet
.end() - 2));
683 void gdbserver_t::process_requests()
685 // See https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html
687 while (!recv_buf
.empty()) {
688 std::vector
<uint8_t> packet
;
689 for (unsigned int i
= 0; i
< recv_buf
.size(); i
++) {
690 uint8_t b
= recv_buf
[i
];
692 if (packet
.empty() && expect_ack
&& b
== '+') {
697 if (packet
.empty() && b
== 3) {
698 fprintf(stderr
, "Received interrupt\n");
705 // Start of new packet.
706 if (!packet
.empty()) {
707 fprintf(stderr
, "Received malformed %ld-byte packet from debug client: ",
709 print_packet(packet
);
717 // Packets consist of $<packet-data>#<checksum>
718 // where <checksum> is
719 if (packet
.size() >= 4 &&
720 packet
[packet
.size()-3] == '#') {
721 handle_packet(packet
);
722 recv_buf
.consume(i
+1);
726 // There's a partial packet in the buffer. Wait until we get more data to
734 void gdbserver_t::handle_halt_reason(const std::vector
<uint8_t> &packet
)
739 void gdbserver_t::handle_general_registers_read(const std::vector
<uint8_t> &packet
)
741 set_operation(new general_registers_read_op_t(*this));
744 void gdbserver_t::set_interrupt(uint32_t hartid
) {
745 sim
->debug_module
.set_interrupt(hartid
);
748 // First byte is the most-significant one.
749 // Eg. "08675309" becomes 0x08675309.
750 uint64_t consume_hex_number(std::vector
<uint8_t>::const_iterator
&iter
,
751 std::vector
<uint8_t>::const_iterator end
)
755 while (iter
!= end
) {
757 uint64_t c_value
= character_hex_value(c
);
767 // First byte is the least-significant one.
768 // Eg. "08675309" becomes 0x09536708
769 uint64_t consume_hex_number_le(std::vector
<uint8_t>::const_iterator
&iter
,
770 std::vector
<uint8_t>::const_iterator end
)
773 unsigned int shift
= 4;
775 while (iter
!= end
) {
777 uint64_t c_value
= character_hex_value(c
);
781 value
|= c_value
<< shift
;
782 if ((shift
% 8) == 0)
790 void consume_string(std::string
&str
, std::vector
<uint8_t>::const_iterator
&iter
,
791 std::vector
<uint8_t>::const_iterator end
, uint8_t separator
)
793 while (iter
!= end
&& *iter
!= separator
) {
794 str
.append(1, (char) *iter
);
799 void gdbserver_t::handle_register_read(const std::vector
<uint8_t> &packet
)
803 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
804 unsigned int n
= consume_hex_number(iter
, packet
.end());
806 return send_packet("E01");
808 set_operation(new register_read_op_t(*this, n
));
811 void gdbserver_t::handle_register_write(const std::vector
<uint8_t> &packet
)
815 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
816 unsigned int n
= consume_hex_number(iter
, packet
.end());
818 return send_packet("E05");
821 reg_t value
= consume_hex_number_le(iter
, packet
.end());
823 return send_packet("E06");
825 processor_t
*p
= sim
->get_core(0);
827 die("handle_register_write");
829 if (n >= REG_XPR0 && n <= REG_XPR31) {
830 p->state.XPR.write(n - REG_XPR0, value);
831 } else if (n == REG_PC) {
833 } else if (n >= REG_FPR0 && n <= REG_FPR31) {
834 p->state.FPR.write(n - REG_FPR0, value);
835 } else if (n >= REG_CSR0 && n <= REG_CSR4095) {
837 p->set_csr(n - REG_CSR0, value);
839 return send_packet("EFF");
842 return send_packet("E07");
846 return send_packet("OK");
849 void gdbserver_t::handle_memory_read(const std::vector
<uint8_t> &packet
)
852 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
853 reg_t address
= consume_hex_number(iter
, packet
.end());
855 return send_packet("E10");
857 reg_t length
= consume_hex_number(iter
, packet
.end());
859 return send_packet("E11");
861 set_operation(new memory_read_op_t(*this, address
, length
));
864 void gdbserver_t::handle_memory_binary_write(const std::vector
<uint8_t> &packet
)
866 // X addr,length:XX...
867 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
868 reg_t address
= consume_hex_number(iter
, packet
.end());
870 return send_packet("E20");
872 reg_t length
= consume_hex_number(iter
, packet
.end());
874 return send_packet("E21");
877 processor_t
*p
= sim
->get_core(0);
878 mmu_t
* mmu
= sim
->debug_mmu
;
879 for (unsigned int i
= 0; i
< length
; i
++) {
880 if (iter
== packet
.end()) {
881 return send_packet("E22");
883 mmu
->store_uint8(address
+ i
, *iter
);
887 return send_packet("E4b"); // EOVERFLOW
892 void gdbserver_t::handle_continue(const std::vector
<uint8_t> &packet
)
895 processor_t
*p
= sim
->get_core(0);
896 if (packet
[2] != '#') {
897 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
898 saved_dpc
= consume_hex_number(iter
, packet
.end());
900 return send_packet("E30");
903 set_operation(new continue_op_t(*this));
906 void gdbserver_t::handle_step(const std::vector
<uint8_t> &packet
)
909 if (packet
[2] != '#') {
910 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
912 //p->state.pc = consume_hex_number(iter, packet.end());
914 return send_packet("E40");
917 // TODO: p->set_single_step(true);
918 // TODO running = true;
921 void gdbserver_t::handle_kill(const std::vector
<uint8_t> &packet
)
924 // The exact effect of this packet is not specified.
925 // Looks like OpenOCD disconnects?
929 void gdbserver_t::handle_extended(const std::vector
<uint8_t> &packet
)
931 // Enable extended mode. In extended mode, the remote server is made
932 // persistent. The ‘R’ packet is used to restart the program being debugged.
934 extended_mode
= true;
937 void software_breakpoint_t::insert(mmu_t
* mmu
)
940 instruction
= mmu
->load_uint16(address
);
941 mmu
->store_uint16(address
, C_EBREAK
);
943 instruction
= mmu
->load_uint32(address
);
944 mmu
->store_uint32(address
, EBREAK
);
946 fprintf(stderr
, ">>> Read %x from %lx\n", instruction
, address
);
949 void software_breakpoint_t::remove(mmu_t
* mmu
)
951 fprintf(stderr
, ">>> write %x to %lx\n", instruction
, address
);
953 mmu
->store_uint16(address
, instruction
);
955 mmu
->store_uint32(address
, instruction
);
959 void gdbserver_t::handle_breakpoint(const std::vector
<uint8_t> &packet
)
961 // insert: Z type,addr,kind
962 // remove: z type,addr,kind
964 software_breakpoint_t bp
;
965 bool insert
= (packet
[1] == 'Z');
966 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
967 int type
= consume_hex_number(iter
, packet
.end());
969 return send_packet("E50");
971 bp
.address
= consume_hex_number(iter
, packet
.end());
973 return send_packet("E51");
975 bp
.size
= consume_hex_number(iter
, packet
.end());
976 // There may be more options after a ; here, but we don't support that.
978 return send_packet("E52");
980 if (bp
.size
!= 2 && bp
.size
!= 4) {
981 return send_packet("E53");
984 processor_t
*p
= sim
->get_core(0);
985 die("handle_breakpoint");
990 breakpoints[bp.address] = bp;
993 bp = breakpoints[bp.address];
995 breakpoints.erase(bp.address);
998 sim->debug_mmu->flush_icache();
1000 return send_packet("OK");
1003 void gdbserver_t::handle_query(const std::vector
<uint8_t> &packet
)
1006 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1008 consume_string(name
, iter
, packet
.end(), ':');
1009 if (iter
!= packet
.end())
1011 if (name
== "Supported") {
1013 while (iter
!= packet
.end()) {
1014 std::string feature
;
1015 consume_string(feature
, iter
, packet
.end(), ';');
1016 if (iter
!= packet
.end())
1018 if (feature
== "swbreak+") {
1022 return end_packet();
1025 fprintf(stderr
, "Unsupported query %s\n", name
.c_str());
1026 return send_packet("");
1029 void gdbserver_t::handle_packet(const std::vector
<uint8_t> &packet
)
1031 if (compute_checksum(packet
) != extract_checksum(packet
)) {
1032 fprintf(stderr
, "Received %ld-byte packet with invalid checksum\n", packet
.size());
1033 fprintf(stderr
, "Computed checksum: %x\n", compute_checksum(packet
));
1034 print_packet(packet
);
1039 fprintf(stderr
, "Received %ld-byte packet from debug client: ", packet
.size());
1040 print_packet(packet
);
1043 switch (packet
[1]) {
1045 return handle_extended(packet
);
1047 return handle_halt_reason(packet
);
1049 return handle_general_registers_read(packet
);
1051 return handle_kill(packet
);
1053 return handle_memory_read(packet
);
1055 // return handle_memory_write(packet);
1057 return handle_memory_binary_write(packet
);
1059 return handle_register_read(packet
);
1061 return handle_register_write(packet
);
1063 return handle_continue(packet
);
1065 return handle_step(packet
);
1068 return handle_breakpoint(packet
);
1071 return handle_query(packet
);
1075 fprintf(stderr
, "** Unsupported packet: ");
1076 print_packet(packet
);
1080 void gdbserver_t::handle_interrupt()
1082 processor_t
*p
= sim
->get_core(0);
1083 // TODO p->set_halted(true, HR_INTERRUPT);
1084 send_packet("S02"); // Pretend program received SIGINT.
1085 // TODO running = false;
1088 void gdbserver_t::handle()
1090 if (client_fd
> 0) {
1091 processor_t
*p
= sim
->get_core(0);
1093 bool interrupt
= sim
->debug_module
.get_interrupt(0);
1096 if (operation
&& operation
->step()) {
1098 set_operation(NULL
);
1104 // gdb requested a halt and now it's done.
1106 fprintf(stderr, "DPC: 0x%x\n", read_debug_ram(0));
1107 fprintf(stderr, "DCSR: 0x%x\n", read_debug_ram(2));
1108 state = STATE_HALTED;
1115 if (running && p->halted) {
1116 // The core was running, but now it's halted. Better tell gdb.
1117 switch (p->halt_reason) {
1119 fprintf(stderr, "Internal error. Processor halted without reason.\n");
1125 // There's no gdb code for this.
1129 send_packet("T05swbreak:;");
1133 // TODO: Actually include register values here
1146 this->process_requests();
1150 void gdbserver_t::send(const char* msg
)
1152 unsigned int length
= strlen(msg
);
1153 for (const char *c
= msg
; *c
; c
++)
1154 running_checksum
+= *c
;
1155 send_buf
.append((const uint8_t *) msg
, length
);
1158 void gdbserver_t::send(uint64_t value
)
1161 for (unsigned int i
= 0; i
< 8; i
++) {
1162 sprintf(buffer
, "%02x", (int) (value
& 0xff));
1168 void gdbserver_t::send(uint32_t value
)
1171 for (unsigned int i
= 0; i
< 4; i
++) {
1172 sprintf(buffer
, "%02x", (int) (value
& 0xff));
1178 void gdbserver_t::send_packet(const char* data
)
1186 void gdbserver_t::start_packet()
1189 running_checksum
= 0;
1192 void gdbserver_t::end_packet(const char* data
)
1198 char checksum_string
[4];
1199 sprintf(checksum_string
, "#%02x", running_checksum
);
1200 send(checksum_string
);