6 #include <sys/socket.h>
17 #include "gdbserver.h"
20 #define C_EBREAK 0x9002
21 #define EBREAK 0x00100073
23 //////////////////////////////////////// Utility Functions
32 void die(const char* msg
)
34 fprintf(stderr
, "gdbserver code died: %s\n", msg
);
38 // gdb's register list is defined in riscv_gdb_reg_names gdb/riscv-tdep.c in
39 // its source tree. We must interpret the numbers the same here.
51 //////////////////////////////////////// Functions to generate RISC-V opcodes.
53 // TODO: Does this already exist somewhere?
56 // Using regnames.cc as source. The RVG Calling Convention of the 2.0 RISC-V
57 // spec says it should be 2 and 3.
60 static uint32_t bits(uint32_t value
, unsigned int hi
, unsigned int lo
) {
61 return (value
>> lo
) & ((1 << (hi
+1-lo
)) - 1);
64 static uint32_t bit(uint32_t value
, unsigned int b
) {
65 return (value
>> b
) & 1;
68 static uint32_t jal(unsigned int rd
, uint32_t imm
) {
69 return (bit(imm
, 20) << 31) |
70 (bits(imm
, 10, 1) << 21) |
71 (bit(imm
, 11) << 20) |
72 (bits(imm
, 19, 12) << 12) |
77 static uint32_t csrsi(unsigned int csr
, uint16_t imm
) {
79 (bits(imm
, 4, 0) << 15) |
83 static uint32_t csrci(unsigned int csr
, uint16_t imm
) {
85 (bits(imm
, 4, 0) << 15) |
89 static uint32_t csrr(unsigned int rd
, unsigned int csr
) {
90 return (csr
<< 20) | (rd
<< 7) | MATCH_CSRRS
;
93 static uint32_t csrw(unsigned int source
, unsigned int csr
) {
94 return (csr
<< 20) | (source
<< 15) | MATCH_CSRRW
;
97 static uint32_t fence_i()
102 static uint32_t sb(unsigned int src
, unsigned int base
, uint16_t offset
)
104 return (bits(offset
, 11, 5) << 25) |
107 (bits(offset
, 4, 0) << 7) |
111 static uint32_t sh(unsigned int src
, unsigned int base
, uint16_t offset
)
113 return (bits(offset
, 11, 5) << 25) |
116 (bits(offset
, 4, 0) << 7) |
120 static uint32_t sw(unsigned int src
, unsigned int base
, uint16_t offset
)
122 return (bits(offset
, 11, 5) << 25) |
125 (bits(offset
, 4, 0) << 7) |
129 static uint32_t sd(unsigned int src
, unsigned int base
, uint16_t offset
)
131 return (bits(offset
, 11, 5) << 25) |
132 (bits(src
, 4, 0) << 20) |
134 (bits(offset
, 4, 0) << 7) |
138 static uint32_t sq(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) |
151 static uint32_t lq(unsigned int rd
, unsigned int base
, uint16_t offset
)
154 return (bits(offset
, 11, 0) << 20) |
156 (bits(rd
, 4, 0) << 7) |
163 static uint32_t ld(unsigned int rd
, unsigned int base
, uint16_t offset
)
165 return (bits(offset
, 11, 0) << 20) |
167 (bits(rd
, 4, 0) << 7) |
171 static uint32_t lw(unsigned int rd
, unsigned int base
, uint16_t offset
)
173 return (bits(offset
, 11, 0) << 20) |
175 (bits(rd
, 4, 0) << 7) |
179 static uint32_t lh(unsigned int rd
, unsigned int base
, uint16_t offset
)
181 return (bits(offset
, 11, 0) << 20) |
183 (bits(rd
, 4, 0) << 7) |
187 static uint32_t lb(unsigned int rd
, unsigned int base
, uint16_t offset
)
189 return (bits(offset
, 11, 0) << 20) |
191 (bits(rd
, 4, 0) << 7) |
195 static uint32_t fsw(unsigned int src
, unsigned int base
, uint16_t offset
)
197 return (bits(offset
, 11, 5) << 25) |
198 (bits(src
, 4, 0) << 20) |
200 (bits(offset
, 4, 0) << 7) |
204 static uint32_t fsd(unsigned int src
, unsigned int base
, uint16_t offset
)
206 return (bits(offset
, 11, 5) << 25) |
207 (bits(src
, 4, 0) << 20) |
209 (bits(offset
, 4, 0) << 7) |
213 static uint32_t flw(unsigned int src
, unsigned int base
, uint16_t offset
)
215 return (bits(offset
, 11, 5) << 25) |
216 (bits(src
, 4, 0) << 20) |
218 (bits(offset
, 4, 0) << 7) |
222 static uint32_t fld(unsigned int src
, unsigned int base
, uint16_t offset
)
224 return (bits(offset
, 11, 5) << 25) |
225 (bits(src
, 4, 0) << 20) |
227 (bits(offset
, 4, 0) << 7) |
231 static uint32_t addi(unsigned int dest
, unsigned int src
, uint16_t imm
)
233 return (bits(imm
, 11, 0) << 20) |
239 static uint32_t ori(unsigned int dest
, unsigned int src
, uint16_t imm
)
241 return (bits(imm
, 11, 0) << 20) |
247 static uint32_t xori(unsigned int dest
, unsigned int src
, uint16_t imm
)
249 return (bits(imm
, 11, 0) << 20) |
255 static uint32_t srli(unsigned int dest
, unsigned int src
, uint8_t shamt
)
257 return (bits(shamt
, 4, 0) << 20) |
264 static uint32_t nop()
266 return addi(0, 0, 0);
269 template <typename T
>
270 unsigned int circular_buffer_t
<T
>::size() const
275 return end
+ capacity
- start
;
278 template <typename T
>
279 void circular_buffer_t
<T
>::consume(unsigned int bytes
)
281 start
= (start
+ bytes
) % capacity
;
284 template <typename T
>
285 unsigned int circular_buffer_t
<T
>::contiguous_empty_size() const
289 return capacity
- end
- 1;
291 return capacity
- end
;
293 return start
- end
- 1;
296 template <typename T
>
297 unsigned int circular_buffer_t
<T
>::contiguous_data_size() const
302 return capacity
- start
;
305 template <typename T
>
306 void circular_buffer_t
<T
>::data_added(unsigned int bytes
)
309 assert(end
<= capacity
);
314 template <typename T
>
315 void circular_buffer_t
<T
>::reset()
321 template <typename T
>
322 void circular_buffer_t
<T
>::append(const T
*src
, unsigned int count
)
324 unsigned int copy
= std::min(count
, contiguous_empty_size());
325 memcpy(contiguous_empty(), src
, copy
* sizeof(T
));
329 assert(count
< contiguous_empty_size());
330 memcpy(contiguous_empty(), src
, count
* sizeof(T
));
335 ////////////////////////////// Debug Operations
337 class halt_op_t
: public operation_t
340 halt_op_t(gdbserver_t
& gdbserver
, bool send_status
=false) :
341 operation_t(gdbserver
), send_status(send_status
),
344 void write_dpc_program() {
345 gs
.dr_write32(0, csrsi(CSR_DCSR
, DCSR_HALT
));
346 gs
.dr_write32(1, csrr(S0
, CSR_DPC
));
347 gs
.dr_write_store(2, S0
, SLOT_DATA0
);
352 bool perform_step(unsigned int step
) {
354 gs
.tselect_valid
= false;
357 gs
.dr_write32(0, xori(S1
, ZERO
, -1));
358 gs
.dr_write32(1, srli(S1
, S1
, 31));
359 // 0x00000001 0x00000001:ffffffff 0x00000001:ffffffff:ffffffff:ffffffff
360 gs
.dr_write32(2, sw(S1
, ZERO
, DEBUG_RAM_START
));
361 gs
.dr_write32(3, srli(S1
, S1
, 31));
362 // 0x00000000 0x00000000:00000003 0x00000000:00000003:ffffffff:ffffffff
363 gs
.dr_write32(4, sw(S1
, ZERO
, DEBUG_RAM_START
+ 4));
376 uint32_t word0
= gs
.dr_read32(0);
377 uint32_t word1
= gs
.dr_read32(1);
379 if (word0
== 1 && word1
== 0) {
381 } else if (word0
== 0xffffffff && word1
== 3) {
383 } else if (word0
== 0xffffffff && word1
== 0xffffffff) {
393 gs
.dpc
= gs
.dr_read(SLOT_DATA0
);
394 gs
.dr_write32(0, csrr(S0
, CSR_MSTATUS
));
395 gs
.dr_write_store(1, S0
, SLOT_DATA0
);
402 gs
.mstatus
= gs
.dr_read(SLOT_DATA0
);
403 gs
.dr_write32(0, csrr(S0
, CSR_DCSR
));
404 gs
.dr_write32(1, sw(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
411 gs
.dcsr
= gs
.dr_read32(4);
413 gs
.sptbr_valid
= false;
414 gs
.pte_cache
.clear();
417 switch (get_field(gs
.dcsr
, DCSR_CAUSE
)) {
418 case DCSR_CAUSE_NONE
:
419 fprintf(stderr
, "Internal error. Processor halted without reason.\n");
422 case DCSR_CAUSE_DEBUGINT
:
423 gs
.send_packet("S02"); // Pretend program received SIGINT.
426 case DCSR_CAUSE_HWBP
:
427 case DCSR_CAUSE_STEP
:
428 case DCSR_CAUSE_HALT
:
429 // There's no gdb code for this.
430 gs
.send_packet("T05");
432 case DCSR_CAUSE_SWBP
:
433 gs
.send_packet("T05swbreak:;");
455 class continue_op_t
: public operation_t
458 continue_op_t(gdbserver_t
& gdbserver
, bool single_step
) :
459 operation_t(gdbserver
), single_step(single_step
) {};
461 bool perform_step(unsigned int step
) {
464 gs
.dr_write_load(0, S0
, SLOT_DATA0
);
465 gs
.dr_write32(1, csrw(S0
, CSR_DPC
));
466 // TODO: Isn't there a fence.i in Debug ROM already?
467 if (gs
.fence_i_required
) {
468 gs
.dr_write32(2, fence_i());
470 gs
.fence_i_required
= false;
474 gs
.dr_write(SLOT_DATA0
, gs
.dpc
);
479 gs
.dr_write_load(0, S0
, SLOT_DATA0
);
480 gs
.dr_write32(1, csrw(S0
, CSR_MSTATUS
));
482 gs
.dr_write(SLOT_DATA0
, gs
.mstatus
);
487 gs
.dr_write32(0, lw(S0
, 0, (uint16_t) DEBUG_RAM_START
+16));
488 gs
.dr_write32(1, csrw(S0
, CSR_DCSR
));
491 reg_t dcsr
= set_field(gs
.dcsr
, DCSR_HALT
, 0);
492 dcsr
= set_field(dcsr
, DCSR_STEP
, single_step
);
493 // Software breakpoints should go here.
494 dcsr
= set_field(dcsr
, DCSR_EBREAKM
, 1);
495 dcsr
= set_field(dcsr
, DCSR_EBREAKH
, 1);
496 dcsr
= set_field(dcsr
, DCSR_EBREAKS
, 1);
497 dcsr
= set_field(dcsr
, DCSR_EBREAKU
, 1);
498 gs
.dr_write32(4, dcsr
);
510 class general_registers_read_op_t
: public operation_t
512 // Register order that gdb expects is:
513 // "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
514 // "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
515 // "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
516 // "x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31",
518 // Each byte of register data is described by two hex digits. The bytes with
519 // the register are transmitted in target byte order. The size of each
520 // register and their position within the ‘g’ packet are determined by the
521 // gdb internal gdbarch functions DEPRECATED_REGISTER_RAW_SIZE and
522 // gdbarch_register_name.
525 general_registers_read_op_t(gdbserver_t
& gdbserver
) :
526 operation_t(gdbserver
) {};
528 bool perform_step(unsigned int step
)
530 D(fprintf(stderr
, "register_read step %d\n", step
));
534 // x0 is always zero.
536 gs
.send((uint32_t) 0);
538 gs
.send((uint64_t) 0);
541 gs
.dr_write_store(0, 1, SLOT_DATA0
);
542 gs
.dr_write_store(1, 2, SLOT_DATA1
);
549 gs
.send((uint32_t) gs
.dr_read(SLOT_DATA0
));
551 gs
.send((uint64_t) gs
.dr_read(SLOT_DATA0
));
559 gs
.send((uint32_t) gs
.dr_read(SLOT_DATA1
));
561 gs
.send((uint64_t) gs
.dr_read(SLOT_DATA1
));
564 unsigned int current_reg
= 2 * step
+ 1;
566 if (current_reg
== S1
) {
567 gs
.dr_write_load(i
++, S1
, SLOT_DATA_LAST
);
569 gs
.dr_write_store(i
++, current_reg
, SLOT_DATA0
);
570 if (current_reg
+ 1 == S0
) {
571 gs
.dr_write32(i
++, csrr(S0
, CSR_DSCRATCH
));
574 gs
.dr_write_store(i
++, current_reg
+1, SLOT_DATA1
);
583 class register_read_op_t
: public operation_t
586 register_read_op_t(gdbserver_t
& gdbserver
, unsigned int reg
) :
587 operation_t(gdbserver
), reg(reg
) {};
589 bool perform_step(unsigned int step
)
593 if (reg
>= REG_XPR0
&& reg
<= REG_XPR31
) {
594 die("handle_register_read");
595 // send(p->state.XPR[reg - REG_XPR0]);
596 } else if (reg
== REG_PC
) {
599 gs
.send((uint32_t) gs
.dpc
);
605 } else if (reg
>= REG_FPR0
&& reg
<= REG_FPR31
) {
606 // send(p->state.FPR[reg - REG_FPR0]);
608 gs
.dr_write32(0, fsw(reg
- REG_FPR0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
610 gs
.dr_write32(0, fsd(reg
- REG_FPR0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
613 } else if (reg
>= REG_CSR0
&& reg
<= REG_CSR4095
) {
614 gs
.dr_write32(0, csrr(S0
, reg
- REG_CSR0
));
615 gs
.dr_write_store(1, S0
, SLOT_DATA0
);
617 // If we hit an exception reading the CSR, we'll end up returning ~0 as
618 // the register's value, which is what we want. (Right?)
619 gs
.dr_write(SLOT_DATA0
, ~(uint64_t) 0);
620 } else if (reg
== REG_PRIV
) {
622 gs
.send((uint8_t) get_field(gs
.dcsr
, DCSR_PRV
));
626 gs
.send_packet("E02");
635 gs
.send(gs
.dr_read32(4));
637 gs
.send(gs
.dr_read(SLOT_DATA0
));
649 class register_write_op_t
: public operation_t
652 register_write_op_t(gdbserver_t
& gdbserver
, unsigned int reg
, reg_t value
) :
653 operation_t(gdbserver
), reg(reg
), value(value
) {};
655 bool perform_step(unsigned int step
)
657 gs
.dr_write_load(0, S0
, SLOT_DATA0
);
658 gs
.dr_write(SLOT_DATA0
, value
);
660 gs
.dr_write32(1, csrw(S0
, CSR_DSCRATCH
));
662 } else if (reg
== S1
) {
663 gs
.dr_write_store(1, S0
, SLOT_DATA_LAST
);
665 } else if (reg
>= REG_XPR0
&& reg
<= REG_XPR31
) {
666 gs
.dr_write32(1, addi(reg
, S0
, 0));
668 } else if (reg
== REG_PC
) {
671 } else if (reg
>= REG_FPR0
&& reg
<= REG_FPR31
) {
673 gs
.dr_write32(0, flw(reg
- REG_FPR0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
675 gs
.dr_write32(0, fld(reg
- REG_FPR0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
678 } else if (reg
>= REG_CSR0
&& reg
<= REG_CSR4095
) {
679 gs
.dr_write32(1, csrw(S0
, reg
- REG_CSR0
));
681 if (reg
== REG_CSR0
+ CSR_SPTBR
) {
683 gs
.sptbr_valid
= true;
685 } else if (reg
== REG_PRIV
) {
686 gs
.dcsr
= set_field(gs
.dcsr
, DCSR_PRV
, value
);
689 gs
.send_packet("E02");
693 gs
.send_packet("OK");
702 class memory_read_op_t
: public operation_t
705 // Read length bytes from vaddr, storing the result into data.
706 // If data is NULL, send the result straight to gdb.
707 memory_read_op_t(gdbserver_t
& gdbserver
, reg_t vaddr
, unsigned int length
,
708 unsigned char *data
=NULL
) :
709 operation_t(gdbserver
), vaddr(vaddr
), length(length
), data(data
) {};
711 bool perform_step(unsigned int step
)
714 // address goes in S0
715 paddr
= gs
.translate(vaddr
);
716 access_size
= gs
.find_access_size(paddr
, length
);
718 gs
.dr_write_load(0, S0
, SLOT_DATA0
);
719 switch (access_size
) {
721 gs
.dr_write32(1, lb(S1
, S0
, 0));
724 gs
.dr_write32(1, lh(S1
, S0
, 0));
727 gs
.dr_write32(1, lw(S1
, S0
, 0));
730 gs
.dr_write32(1, ld(S1
, S0
, 0));
733 gs
.dr_write_store(2, S1
, SLOT_DATA1
);
735 gs
.dr_write(SLOT_DATA0
, paddr
);
745 reg_t value
= gs
.dr_read(SLOT_DATA1
);
746 for (unsigned int i
= 0; i
< access_size
; i
++) {
748 *(data
++) = value
& 0xff;
749 D(fprintf(stderr
, "%02x", (unsigned int) (value
& 0xff)));
751 sprintf(buffer
, "%02x", (unsigned int) (value
& 0xff));
757 D(fprintf(stderr
, "\n"));
759 length
-= access_size
;
760 paddr
+= access_size
;
768 gs
.dr_write(SLOT_DATA0
, paddr
);
779 unsigned int access_size
;
782 class memory_write_op_t
: public operation_t
785 memory_write_op_t(gdbserver_t
& gdbserver
, reg_t vaddr
, unsigned int length
,
786 const unsigned char *data
) :
787 operation_t(gdbserver
), vaddr(vaddr
), offset(0), length(length
), data(data
) {};
789 ~memory_write_op_t() {
793 bool perform_step(unsigned int step
)
795 reg_t paddr
= gs
.translate(vaddr
);
797 unsigned int data_offset
;
800 data_offset
= slot_offset32
[SLOT_DATA1
];
803 data_offset
= slot_offset64
[SLOT_DATA1
];
806 data_offset
= slot_offset128
[SLOT_DATA1
];
813 access_size
= gs
.find_access_size(paddr
, length
);
815 D(fprintf(stderr
, "write to 0x%lx -> 0x%lx (access=%d): ", vaddr
, paddr
,
817 for (unsigned int i
= 0; i
< length
; i
++) {
818 D(fprintf(stderr
, "%02x", data
[i
]));
820 D(fprintf(stderr
, "\n"));
822 // address goes in S0
823 gs
.dr_write_load(0, S0
, SLOT_DATA0
);
824 switch (access_size
) {
826 gs
.dr_write32(1, lb(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 4*data_offset
));
827 gs
.dr_write32(2, sb(S1
, S0
, 0));
828 gs
.dr_write32(data_offset
, data
[0]);
831 gs
.dr_write32(1, lh(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 4*data_offset
));
832 gs
.dr_write32(2, sh(S1
, S0
, 0));
833 gs
.dr_write32(data_offset
, data
[0] | (data
[1] << 8));
836 gs
.dr_write32(1, lw(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 4*data_offset
));
837 gs
.dr_write32(2, sw(S1
, S0
, 0));
838 gs
.dr_write32(data_offset
, data
[0] | (data
[1] << 8) |
839 (data
[2] << 16) | (data
[3] << 24));
842 gs
.dr_write32(1, ld(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 4*data_offset
));
843 gs
.dr_write32(2, sd(S1
, S0
, 0));
844 gs
.dr_write32(data_offset
, data
[0] | (data
[1] << 8) |
845 (data
[2] << 16) | (data
[3] << 24));
846 gs
.dr_write32(data_offset
+1, data
[4] | (data
[5] << 8) |
847 (data
[6] << 16) | (data
[7] << 24));
850 fprintf(stderr
, "gdbserver error: write %d bytes to 0x%lx -> 0x%lx; "
851 "access_size=%d\n", length
, vaddr
, paddr
, access_size
);
852 gs
.send_packet("E12");
856 gs
.dr_write(SLOT_DATA0
, paddr
);
862 if (gs
.dr_read32(DEBUG_RAM_SIZE
/ 4 - 1)) {
863 fprintf(stderr
, "Exception happened while writing to 0x%lx -> 0x%lx\n",
867 offset
+= access_size
;
868 if (offset
>= length
) {
869 gs
.send_packet("OK");
872 const unsigned char *d
= data
+ offset
;
873 switch (access_size
) {
875 gs
.dr_write32(data_offset
, d
[0]);
878 gs
.dr_write32(data_offset
, d
[0] | (d
[1] << 8));
881 gs
.dr_write32(data_offset
, d
[0] | (d
[1] << 8) |
882 (d
[2] << 16) | (d
[3] << 24));
885 gs
.dr_write32(data_offset
, d
[0] | (d
[1] << 8) |
886 (d
[2] << 16) | (d
[3] << 24));
887 gs
.dr_write32(data_offset
+1, d
[4] | (d
[5] << 8) |
888 (d
[6] << 16) | (d
[7] << 24));
891 gs
.send_packet("E13");
894 gs
.dr_write(SLOT_DATA0
, paddr
+ offset
);
904 unsigned int access_size
;
905 const unsigned char *data
;
908 class collect_translation_info_op_t
: public operation_t
911 // Read sufficient information from the target into gdbserver structures so
912 // that it's possible to translate vaddr, vaddr+length, and all addresses
913 // in between to physical addresses.
914 collect_translation_info_op_t(gdbserver_t
& gdbserver
, reg_t vaddr
, size_t length
) :
915 operation_t(gdbserver
), state(STATE_START
), vaddr(vaddr
), length(length
) {};
917 bool perform_step(unsigned int step
)
919 unsigned int vm
= gs
.virtual_memory();
924 // Nothing to be done.
946 sprintf(buf
, "VM mode %d is not supported by gdbserver.cc.", vm
);
948 return true; // die doesn't return, but gcc doesn't know that.
953 // Perform any reads from the just-completed action.
957 case STATE_READ_SPTBR
:
958 gs
.sptbr
= gs
.dr_read(SLOT_DATA0
);
959 gs
.sptbr_valid
= true;
963 gs
.pte_cache
[pte_addr
] = gs
.dr_read32(4);
965 gs
.pte_cache
[pte_addr
] = ((uint64_t) gs
.dr_read32(5) << 32) |
968 D(fprintf(stderr
, "pte_cache[0x%lx] = 0x%lx\n", pte_addr
, gs
.pte_cache
[pte_addr
]));
972 // Set up the next action.
973 // We only get here for VM_SV32/39/38.
975 if (!gs
.sptbr_valid
) {
976 state
= STATE_READ_SPTBR
;
977 gs
.dr_write32(0, csrr(S0
, CSR_SPTBR
));
978 gs
.dr_write_store(1, S0
, SLOT_DATA0
);
984 reg_t base
= gs
.sptbr
<< PGSHIFT
;
985 int ptshift
= (levels
- 1) * ptidxbits
;
986 for (unsigned int i
= 0; i
< levels
; i
++, ptshift
-= ptidxbits
) {
987 reg_t idx
= (vaddr
>> (PGSHIFT
+ ptshift
)) & ((1 << ptidxbits
) - 1);
989 pte_addr
= base
+ idx
* ptesize
;
990 auto it
= gs
.pte_cache
.find(pte_addr
);
991 if (it
== gs
.pte_cache
.end()) {
992 state
= STATE_READ_PTE
;
994 gs
.dr_write32(0, lw(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
995 gs
.dr_write32(1, lw(S1
, S0
, 0));
996 gs
.dr_write32(2, sw(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
998 assert(gs
.xlen
>= 64);
999 gs
.dr_write32(0, ld(S0
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
1000 gs
.dr_write32(1, ld(S1
, S0
, 0));
1001 gs
.dr_write32(2, sd(S1
, 0, (uint16_t) DEBUG_RAM_START
+ 16));
1003 gs
.dr_write32(3, jal(0, (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*3))));
1004 gs
.dr_write32(4, pte_addr
);
1005 gs
.dr_write32(5, pte_addr
>> 32);
1006 gs
.set_interrupt(0);
1010 reg_t pte
= gs
.pte_cache
[pte_addr
];
1011 reg_t ppn
= pte
>> PTE_PPN_SHIFT
;
1013 if (PTE_TABLE(pte
)) { // next level of page table
1014 base
= ppn
<< PGSHIFT
;
1016 // We've collected all the data required for the translation.
1021 "ERROR: gdbserver couldn't find appropriate PTEs to translate 0x%lx\n",
1034 unsigned int levels
;
1035 unsigned int ptidxbits
;
1036 unsigned int ptesize
;
1040 class hardware_breakpoint_insert_op_t
: public operation_t
1043 hardware_breakpoint_insert_op_t(gdbserver_t
& gdbserver
,
1044 hardware_breakpoint_t bp
) :
1045 operation_t(gdbserver
), state(STATE_START
), bp(bp
) {};
1047 void write_new_index_program()
1049 gs
.dr_write_load(0, S0
, SLOT_DATA1
);
1050 gs
.dr_write32(1, csrw(S0
, CSR_TSELECT
));
1051 gs
.dr_write32(2, csrr(S0
, CSR_TSELECT
));
1052 gs
.dr_write_store(3, S0
, SLOT_DATA1
);
1053 gs
.dr_write_jump(4);
1054 gs
.dr_write(SLOT_DATA1
, bp
.index
);
1057 bool perform_step(unsigned int step
)
1062 write_new_index_program();
1063 state
= STATE_CHECK_INDEX
;
1066 case STATE_CHECK_INDEX
:
1067 if (gs
.dr_read(SLOT_DATA1
) != bp
.index
) {
1068 // We've exhausted breakpoints without finding an appropriate one.
1069 gs
.send_packet("E58");
1073 gs
.dr_write32(0, csrr(S0
, CSR_TDATA1
));
1074 gs
.dr_write_store(1, S0
, SLOT_DATA0
);
1075 gs
.dr_write_jump(2);
1076 state
= STATE_CHECK_MCONTROL
;
1079 case STATE_CHECK_MCONTROL
:
1081 reg_t mcontrol
= gs
.dr_read(SLOT_DATA0
);
1082 unsigned int type
= mcontrol
>> (gs
.xlen
- 4);
1084 // We've exhausted breakpoints without finding an appropriate one.
1085 gs
.send_packet("E58");
1090 !get_field(mcontrol
, MCONTROL_EXECUTE
) &&
1091 !get_field(mcontrol
, MCONTROL_LOAD
) &&
1092 !get_field(mcontrol
, MCONTROL_STORE
)) {
1093 // Found an unused trigger.
1094 gs
.dr_write_load(0, S0
, SLOT_DATA1
);
1095 gs
.dr_write32(1, csrw(S0
, CSR_TDATA1
));
1096 gs
.dr_write_jump(2);
1097 mcontrol
= set_field(0, MCONTROL_ACTION
, MCONTROL_ACTION_DEBUG_MODE
);
1098 mcontrol
= set_field(mcontrol
, MCONTROL_DMODE(gs
.xlen
), 1);
1099 mcontrol
= set_field(mcontrol
, MCONTROL_MATCH
, MCONTROL_MATCH_EQUAL
);
1100 mcontrol
= set_field(mcontrol
, MCONTROL_M
, 1);
1101 mcontrol
= set_field(mcontrol
, MCONTROL_H
, 1);
1102 mcontrol
= set_field(mcontrol
, MCONTROL_S
, 1);
1103 mcontrol
= set_field(mcontrol
, MCONTROL_U
, 1);
1104 mcontrol
= set_field(mcontrol
, MCONTROL_EXECUTE
, bp
.execute
);
1105 mcontrol
= set_field(mcontrol
, MCONTROL_LOAD
, bp
.load
);
1106 mcontrol
= set_field(mcontrol
, MCONTROL_STORE
, bp
.store
);
1107 gs
.dr_write(SLOT_DATA1
, mcontrol
);
1108 state
= STATE_WRITE_ADDRESS
;
1111 write_new_index_program();
1112 state
= STATE_CHECK_INDEX
;
1117 case STATE_WRITE_ADDRESS
:
1119 gs
.dr_write_load(0, S0
, SLOT_DATA1
);
1120 gs
.dr_write32(1, csrw(S0
, CSR_TDATA2
));
1121 gs
.dr_write_jump(2);
1122 gs
.dr_write(SLOT_DATA1
, bp
.vaddr
);
1123 gs
.set_interrupt(0);
1124 gs
.send_packet("OK");
1126 gs
.hardware_breakpoints
.insert(bp
);
1132 gs
.set_interrupt(0);
1140 STATE_CHECK_MCONTROL
,
1143 hardware_breakpoint_t bp
;
1146 class maybe_save_tselect_op_t
: public operation_t
1149 maybe_save_tselect_op_t(gdbserver_t
& gdbserver
) : operation_t(gdbserver
) {};
1150 bool perform_step(unsigned int step
) {
1151 if (gs
.tselect_valid
)
1156 gs
.dr_write32(0, csrr(S0
, CSR_TDATA1
));
1157 gs
.dr_write_store(1, S0
, SLOT_DATA0
);
1158 gs
.dr_write_jump(2);
1159 gs
.set_interrupt(0);
1162 gs
.tselect
= gs
.dr_read(SLOT_DATA0
);
1163 gs
.tselect_valid
= true;
1170 class maybe_restore_tselect_op_t
: public operation_t
1173 maybe_restore_tselect_op_t(gdbserver_t
& gdbserver
) : operation_t(gdbserver
) {};
1174 bool perform_step(unsigned int step
) {
1175 if (gs
.tselect_valid
) {
1176 gs
.dr_write_load(0, S0
, SLOT_DATA1
);
1177 gs
.dr_write32(1, csrw(S0
, CSR_TSELECT
));
1178 gs
.dr_write_jump(2);
1179 gs
.dr_write(SLOT_DATA1
, gs
.tselect
);
1185 class hardware_breakpoint_remove_op_t
: public operation_t
1188 hardware_breakpoint_remove_op_t(gdbserver_t
& gdbserver
,
1189 hardware_breakpoint_t bp
) :
1190 operation_t(gdbserver
), bp(bp
) {};
1192 bool perform_step(unsigned int step
) {
1193 gs
.dr_write32(0, addi(S0
, ZERO
, bp
.index
));
1194 gs
.dr_write32(1, csrw(S0
, CSR_TSELECT
));
1195 gs
.dr_write32(2, csrw(ZERO
, CSR_TDATA1
));
1196 gs
.dr_write_jump(3);
1197 gs
.set_interrupt(0);
1202 hardware_breakpoint_t bp
;
1205 ////////////////////////////// gdbserver itself
1207 gdbserver_t::gdbserver_t(uint16_t port
, sim_t
*sim
) :
1211 recv_buf(64 * 1024), send_buf(64 * 1024)
1213 socket_fd
= socket(AF_INET
, SOCK_STREAM
, 0);
1214 if (socket_fd
== -1) {
1215 fprintf(stderr
, "failed to make socket: %s (%d)\n", strerror(errno
), errno
);
1219 fcntl(socket_fd
, F_SETFL
, O_NONBLOCK
);
1221 if (setsockopt(socket_fd
, SOL_SOCKET
, SO_REUSEADDR
, &reuseaddr
,
1222 sizeof(int)) == -1) {
1223 fprintf(stderr
, "failed setsockopt: %s (%d)\n", strerror(errno
), errno
);
1227 struct sockaddr_in addr
;
1228 memset(&addr
, 0, sizeof(addr
));
1229 addr
.sin_family
= AF_INET
;
1230 addr
.sin_addr
.s_addr
= INADDR_ANY
;
1231 addr
.sin_port
= htons(port
);
1233 if (bind(socket_fd
, (struct sockaddr
*) &addr
, sizeof(addr
)) == -1) {
1234 fprintf(stderr
, "failed to bind socket: %s (%d)\n", strerror(errno
), errno
);
1238 if (listen(socket_fd
, 1) == -1) {
1239 fprintf(stderr
, "failed to listen on socket: %s (%d)\n", strerror(errno
), errno
);
1244 unsigned int gdbserver_t::find_access_size(reg_t address
, int length
)
1246 reg_t composite
= address
| length
;
1247 if ((composite
& 0x7) == 0 && xlen
>= 64)
1249 if ((composite
& 0x3) == 0)
1254 reg_t
gdbserver_t::translate(reg_t vaddr
)
1256 unsigned int vm
= virtual_memory();
1257 unsigned int levels
, ptidxbits
, ptesize
;
1282 sprintf(buf
, "VM mode %d is not supported by gdbserver.cc.", vm
);
1284 return true; // die doesn't return, but gcc doesn't know that.
1288 // Handle page tables here. There's a bunch of duplicated code with
1289 // collect_translation_info_op_t. :-(
1290 reg_t base
= sptbr
<< PGSHIFT
;
1291 int ptshift
= (levels
- 1) * ptidxbits
;
1292 for (unsigned int i
= 0; i
< levels
; i
++, ptshift
-= ptidxbits
) {
1293 reg_t idx
= (vaddr
>> (PGSHIFT
+ ptshift
)) & ((1 << ptidxbits
) - 1);
1295 reg_t pte_addr
= base
+ idx
* ptesize
;
1296 auto it
= pte_cache
.find(pte_addr
);
1297 if (it
== pte_cache
.end()) {
1298 fprintf(stderr
, "ERROR: gdbserver tried to translate 0x%lx without first "
1299 "collecting the relevant PTEs.\n", vaddr
);
1300 die("gdbserver_t::translate()");
1303 reg_t pte
= pte_cache
[pte_addr
];
1304 reg_t ppn
= pte
>> PTE_PPN_SHIFT
;
1306 if (PTE_TABLE(pte
)) { // next level of page table
1307 base
= ppn
<< PGSHIFT
;
1309 // We've collected all the data required for the translation.
1310 reg_t vpn
= vaddr
>> PGSHIFT
;
1311 reg_t paddr
= (ppn
| (vpn
& ((reg_t(1) << ptshift
) - 1))) << PGSHIFT
;
1312 paddr
+= vaddr
& (PGSIZE
-1);
1313 D(fprintf(stderr
, "gdbserver translate 0x%lx -> 0x%lx\n", vaddr
, paddr
));
1318 fprintf(stderr
, "ERROR: gdbserver tried to translate 0x%lx but the relevant "
1319 "PTEs are invalid.\n", vaddr
);
1320 // TODO: Is it better to throw an exception here?
1324 unsigned int gdbserver_t::privilege_mode()
1326 unsigned int mode
= get_field(dcsr
, DCSR_PRV
);
1327 if (get_field(mstatus
, MSTATUS_MPRV
))
1328 mode
= get_field(mstatus
, MSTATUS_MPP
);
1332 unsigned int gdbserver_t::virtual_memory()
1334 unsigned int mode
= privilege_mode();
1337 return get_field(mstatus
, MSTATUS_VM
);
1340 void gdbserver_t::dr_write32(unsigned int index
, uint32_t value
)
1342 sim
->debug_module
.ram_write32(index
, value
);
1345 void gdbserver_t::dr_write64(unsigned int index
, uint64_t value
)
1347 dr_write32(index
, value
);
1348 dr_write32(index
+1, value
>> 32);
1351 void gdbserver_t::dr_write(enum slot slot
, uint64_t value
)
1355 dr_write32(slot_offset32
[slot
], value
);
1358 dr_write64(slot_offset64
[slot
], value
);
1366 void gdbserver_t::dr_write_jump(unsigned int index
)
1368 dr_write32(index
, jal(0,
1369 (uint32_t) (DEBUG_ROM_RESUME
- (DEBUG_RAM_START
+ 4*index
))));
1372 void gdbserver_t::dr_write_store(unsigned int index
, unsigned int reg
, enum slot slot
)
1374 assert(slot
!= SLOT_INST0
|| index
> 2);
1375 assert(slot
!= SLOT_DATA0
|| index
< 4 || index
> 6);
1376 assert(slot
!= SLOT_DATA1
|| index
< 5 || index
> 10);
1377 assert(slot
!= SLOT_DATA_LAST
|| index
< 6 || index
> 14);
1380 return dr_write32(index
,
1381 sw(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset32
[slot
]));
1383 return dr_write32(index
,
1384 sd(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset64
[slot
]));
1386 return dr_write32(index
,
1387 sq(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset128
[slot
]));
1389 fprintf(stderr
, "xlen is %d!\n", xlen
);
1394 void gdbserver_t::dr_write_load(unsigned int index
, unsigned int reg
, enum slot slot
)
1398 return dr_write32(index
,
1399 lw(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset32
[slot
]));
1401 return dr_write32(index
,
1402 ld(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset64
[slot
]));
1404 return dr_write32(index
,
1405 lq(reg
, 0, (uint16_t) DEBUG_RAM_START
+ 4 * slot_offset128
[slot
]));
1407 fprintf(stderr
, "xlen is %d!\n", xlen
);
1412 uint32_t gdbserver_t::dr_read32(unsigned int index
)
1414 uint32_t value
= sim
->debug_module
.ram_read32(index
);
1415 D(fprintf(stderr
, "read32(%d) -> 0x%x\n", index
, value
));
1419 uint64_t gdbserver_t::dr_read64(unsigned int index
)
1421 return ((uint64_t) dr_read32(index
+1) << 32) | dr_read32(index
);
1424 uint64_t gdbserver_t::dr_read(enum slot slot
)
1428 return dr_read32(slot_offset32
[slot
]);
1430 return dr_read64(slot_offset64
[slot
]);
1438 void gdbserver_t::add_operation(operation_t
* operation
)
1440 operation_queue
.push(operation
);
1443 void gdbserver_t::accept()
1445 client_fd
= ::accept(socket_fd
, NULL
, NULL
);
1446 if (client_fd
== -1) {
1447 if (errno
== EAGAIN
) {
1448 // No client waiting to connect right now.
1450 fprintf(stderr
, "failed to accept on socket: %s (%d)\n", strerror(errno
),
1455 fcntl(client_fd
, F_SETFL
, O_NONBLOCK
);
1458 extended_mode
= false;
1460 // gdb wants the core to be halted when it attaches.
1461 add_operation(new halt_op_t(*this));
1465 void gdbserver_t::read()
1467 // Reading from a non-blocking socket still blocks if there is no data
1470 size_t count
= recv_buf
.contiguous_empty_size();
1472 ssize_t bytes
= ::read(client_fd
, recv_buf
.contiguous_empty(), count
);
1474 if (errno
== EAGAIN
) {
1475 // We'll try again the next call.
1477 fprintf(stderr
, "failed to read on socket: %s (%d)\n", strerror(errno
), errno
);
1480 } else if (bytes
== 0) {
1481 // The remote disconnected.
1483 processor_t
*p
= sim
->get_core(0);
1484 // TODO p->set_halted(false, HR_NONE);
1488 recv_buf
.data_added(bytes
);
1492 void gdbserver_t::write()
1494 if (send_buf
.empty())
1497 while (!send_buf
.empty()) {
1498 unsigned int count
= send_buf
.contiguous_data_size();
1500 ssize_t bytes
= ::write(client_fd
, send_buf
.contiguous_data(), count
);
1502 fprintf(stderr
, "failed to write to socket: %s (%d)\n", strerror(errno
), errno
);
1504 } else if (bytes
== 0) {
1505 // Client can't take any more data right now.
1508 D(fprintf(stderr
, "wrote %ld bytes: ", bytes
));
1509 for (unsigned int i
= 0; i
< bytes
; i
++) {
1510 D(fprintf(stderr
, "%c", send_buf
[i
]));
1512 D(fprintf(stderr
, "\n"));
1513 send_buf
.consume(bytes
);
1518 void print_packet(const std::vector
<uint8_t> &packet
)
1520 for (uint8_t c
: packet
) {
1521 if (c
>= ' ' and c
<= '~')
1522 fprintf(stderr
, "%c", c
);
1524 fprintf(stderr
, "\\x%02x", c
);
1526 fprintf(stderr
, "\n");
1529 uint8_t compute_checksum(const std::vector
<uint8_t> &packet
)
1531 uint8_t checksum
= 0;
1532 for (auto i
= packet
.begin() + 1; i
!= packet
.end() - 3; i
++ ) {
1538 uint8_t character_hex_value(uint8_t character
)
1540 if (character
>= '0' && character
<= '9')
1541 return character
- '0';
1542 if (character
>= 'a' && character
<= 'f')
1543 return 10 + character
- 'a';
1544 if (character
>= 'A' && character
<= 'F')
1545 return 10 + character
- 'A';
1549 uint8_t extract_checksum(const std::vector
<uint8_t> &packet
)
1551 return character_hex_value(*(packet
.end() - 1)) +
1552 16 * character_hex_value(*(packet
.end() - 2));
1555 void gdbserver_t::process_requests()
1557 // See https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html
1559 while (!recv_buf
.empty()) {
1560 std::vector
<uint8_t> packet
;
1561 for (unsigned int i
= 0; i
< recv_buf
.size(); i
++) {
1562 uint8_t b
= recv_buf
[i
];
1564 if (packet
.empty() && expect_ack
&& b
== '+') {
1565 recv_buf
.consume(1);
1569 if (packet
.empty() && b
== 3) {
1570 D(fprintf(stderr
, "Received interrupt\n"));
1571 recv_buf
.consume(1);
1577 // Start of new packet.
1578 if (!packet
.empty()) {
1579 fprintf(stderr
, "Received malformed %ld-byte packet from debug client: ",
1581 print_packet(packet
);
1582 recv_buf
.consume(i
);
1587 packet
.push_back(b
);
1589 // Packets consist of $<packet-data>#<checksum>
1590 // where <checksum> is
1591 if (packet
.size() >= 4 &&
1592 packet
[packet
.size()-3] == '#') {
1593 handle_packet(packet
);
1594 recv_buf
.consume(i
+1);
1598 // There's a partial packet in the buffer. Wait until we get more data to
1600 if (packet
.size()) {
1606 void gdbserver_t::handle_halt_reason(const std::vector
<uint8_t> &packet
)
1611 void gdbserver_t::handle_general_registers_read(const std::vector
<uint8_t> &packet
)
1613 add_operation(new general_registers_read_op_t(*this));
1616 void gdbserver_t::set_interrupt(uint32_t hartid
) {
1617 sim
->debug_module
.set_interrupt(hartid
);
1620 // First byte is the most-significant one.
1621 // Eg. "08675309" becomes 0x08675309.
1622 uint64_t consume_hex_number(std::vector
<uint8_t>::const_iterator
&iter
,
1623 std::vector
<uint8_t>::const_iterator end
)
1627 while (iter
!= end
) {
1629 uint64_t c_value
= character_hex_value(c
);
1639 // First byte is the least-significant one.
1640 // Eg. "08675309" becomes 0x09536708
1641 uint64_t consume_hex_number_le(std::vector
<uint8_t>::const_iterator
&iter
,
1642 std::vector
<uint8_t>::const_iterator end
)
1645 unsigned int shift
= 4;
1647 while (iter
!= end
) {
1649 uint64_t c_value
= character_hex_value(c
);
1653 value
|= c_value
<< shift
;
1654 if ((shift
% 8) == 0)
1662 void consume_string(std::string
&str
, std::vector
<uint8_t>::const_iterator
&iter
,
1663 std::vector
<uint8_t>::const_iterator end
, uint8_t separator
)
1665 while (iter
!= end
&& *iter
!= separator
) {
1666 str
.append(1, (char) *iter
);
1671 void gdbserver_t::handle_register_read(const std::vector
<uint8_t> &packet
)
1675 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1676 unsigned int n
= consume_hex_number(iter
, packet
.end());
1678 return send_packet("E01");
1680 add_operation(new register_read_op_t(*this, n
));
1683 void gdbserver_t::handle_register_write(const std::vector
<uint8_t> &packet
)
1687 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1688 unsigned int n
= consume_hex_number(iter
, packet
.end());
1690 return send_packet("E05");
1693 reg_t value
= consume_hex_number_le(iter
, packet
.end());
1695 return send_packet("E06");
1697 processor_t
*p
= sim
->get_core(0);
1699 add_operation(new register_write_op_t(*this, n
, value
));
1701 return send_packet("OK");
1704 void gdbserver_t::handle_memory_read(const std::vector
<uint8_t> &packet
)
1707 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1708 reg_t address
= consume_hex_number(iter
, packet
.end());
1710 return send_packet("E10");
1712 reg_t length
= consume_hex_number(iter
, packet
.end());
1714 return send_packet("E11");
1716 add_operation(new collect_translation_info_op_t(*this, address
, length
));
1717 add_operation(new memory_read_op_t(*this, address
, length
));
1720 void gdbserver_t::handle_memory_binary_write(const std::vector
<uint8_t> &packet
)
1722 // X addr,length:XX...
1723 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1724 reg_t address
= consume_hex_number(iter
, packet
.end());
1726 return send_packet("E20");
1728 reg_t length
= consume_hex_number(iter
, packet
.end());
1730 return send_packet("E21");
1734 return send_packet("OK");
1737 unsigned char *data
= new unsigned char[length
];
1738 for (unsigned int i
= 0; i
< length
; i
++) {
1739 if (iter
== packet
.end()) {
1740 return send_packet("E22");
1745 // The binary data representation uses 7d (ascii ‘}’) as an escape
1746 // character. Any escaped byte is transmitted as the escape character
1747 // followed by the original character XORed with 0x20. For example, the
1748 // byte 0x7d would be transmitted as the two bytes 0x7d 0x5d. The bytes
1749 // 0x23 (ascii ‘#’), 0x24 (ascii ‘$’), and 0x7d (ascii ‘}’) must always
1751 if (iter
== packet
.end()) {
1752 return send_packet("E23");
1760 return send_packet("E4b"); // EOVERFLOW
1762 add_operation(new collect_translation_info_op_t(*this, address
, length
));
1763 add_operation(new memory_write_op_t(*this, address
, length
, data
));
1766 void gdbserver_t::handle_continue(const std::vector
<uint8_t> &packet
)
1769 processor_t
*p
= sim
->get_core(0);
1770 if (packet
[2] != '#') {
1771 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1772 dpc
= consume_hex_number(iter
, packet
.end());
1774 return send_packet("E30");
1777 add_operation(new maybe_restore_tselect_op_t(*this));
1778 add_operation(new continue_op_t(*this, false));
1781 void gdbserver_t::handle_step(const std::vector
<uint8_t> &packet
)
1784 if (packet
[2] != '#') {
1785 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1787 //p->state.pc = consume_hex_number(iter, packet.end());
1789 return send_packet("E40");
1792 add_operation(new maybe_restore_tselect_op_t(*this));
1793 add_operation(new continue_op_t(*this, true));
1796 void gdbserver_t::handle_kill(const std::vector
<uint8_t> &packet
)
1799 // The exact effect of this packet is not specified.
1800 // Looks like OpenOCD disconnects?
1804 void gdbserver_t::handle_extended(const std::vector
<uint8_t> &packet
)
1806 // Enable extended mode. In extended mode, the remote server is made
1807 // persistent. The ‘R’ packet is used to restart the program being debugged.
1809 extended_mode
= true;
1812 void gdbserver_t::software_breakpoint_insert(reg_t vaddr
, unsigned int size
)
1814 fence_i_required
= true;
1815 add_operation(new collect_translation_info_op_t(*this, vaddr
, size
));
1816 unsigned char* inst
= new unsigned char[4];
1818 inst
[0] = C_EBREAK
& 0xff;
1819 inst
[1] = (C_EBREAK
>> 8) & 0xff;
1821 inst
[0] = EBREAK
& 0xff;
1822 inst
[1] = (EBREAK
>> 8) & 0xff;
1823 inst
[2] = (EBREAK
>> 16) & 0xff;
1824 inst
[3] = (EBREAK
>> 24) & 0xff;
1827 software_breakpoint_t bp
= {
1831 software_breakpoints
[vaddr
] = bp
;
1832 add_operation(new memory_read_op_t(*this, bp
.vaddr
, bp
.size
,
1833 software_breakpoints
[bp
.vaddr
].instruction
));
1834 add_operation(new memory_write_op_t(*this, bp
.vaddr
, bp
.size
, inst
));
1837 void gdbserver_t::software_breakpoint_remove(reg_t vaddr
, unsigned int size
)
1839 fence_i_required
= true;
1840 add_operation(new collect_translation_info_op_t(*this, vaddr
, size
));
1842 software_breakpoint_t found_bp
= software_breakpoints
[vaddr
];
1843 unsigned char* instruction
= new unsigned char[4];
1844 memcpy(instruction
, found_bp
.instruction
, 4);
1845 add_operation(new memory_write_op_t(*this, found_bp
.vaddr
,
1846 found_bp
.size
, instruction
));
1847 software_breakpoints
.erase(vaddr
);
1850 void gdbserver_t::hardware_breakpoint_insert(const hardware_breakpoint_t
&bp
)
1852 add_operation(new maybe_save_tselect_op_t(*this));
1853 add_operation(new hardware_breakpoint_insert_op_t(*this, bp
));
1856 void gdbserver_t::hardware_breakpoint_remove(const hardware_breakpoint_t
&bp
)
1858 add_operation(new maybe_save_tselect_op_t(*this));
1859 hardware_breakpoint_t found
= *hardware_breakpoints
.find(bp
);
1860 add_operation(new hardware_breakpoint_remove_op_t(*this, found
));
1863 void gdbserver_t::handle_breakpoint(const std::vector
<uint8_t> &packet
)
1865 // insert: Z type,addr,length
1866 // remove: z type,addr,length
1868 // type: 0 - software breakpoint, 1 - hardware breakpoint, 2 - write
1869 // watchpoint, 3 - read watchpoint, 4 - access watchpoint; addr is address;
1870 // length is in bytes. For a software breakpoint, length specifies the size
1871 // of the instruction to be patched. For hardware breakpoints and watchpoints
1872 // length specifies the memory region to be monitored. To avoid potential
1873 // problems with duplicate packets, the operations should be implemented in
1874 // an idempotent way.
1876 bool insert
= (packet
[1] == 'Z');
1877 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1878 gdb_breakpoint_type_t type
= static_cast<gdb_breakpoint_type_t
>(
1879 consume_hex_number(iter
, packet
.end()));
1881 return send_packet("E50");
1883 reg_t address
= consume_hex_number(iter
, packet
.end());
1885 return send_packet("E51");
1887 unsigned int size
= consume_hex_number(iter
, packet
.end());
1888 // There may be more options after a ; here, but we don't support that.
1890 return send_packet("E52");
1894 if (size
!= 2 && size
!= 4) {
1895 return send_packet("E53");
1898 software_breakpoint_insert(address
, size
);
1900 software_breakpoint_remove(address
, size
);
1909 hardware_breakpoint_t bp
= {
1913 bp
.load
= (type
== GB_READ
|| type
== GB_ACCESS
);
1914 bp
.store
= (type
== GB_WRITE
|| type
== GB_ACCESS
);
1915 bp
.execute
= (type
== GB_HARDWARE
|| type
== GB_ACCESS
);
1917 hardware_breakpoint_insert(bp
);
1918 // Insert might fail if there's no space, so the insert operation will
1919 // send its own OK (or not).
1922 hardware_breakpoint_remove(bp
);
1928 return send_packet("E56");
1931 return send_packet("OK");
1934 void gdbserver_t::handle_query(const std::vector
<uint8_t> &packet
)
1937 std::vector
<uint8_t>::const_iterator iter
= packet
.begin() + 2;
1939 consume_string(name
, iter
, packet
.end(), ':');
1940 if (iter
!= packet
.end())
1942 if (name
== "Supported") {
1944 while (iter
!= packet
.end()) {
1945 std::string feature
;
1946 consume_string(feature
, iter
, packet
.end(), ';');
1947 if (iter
!= packet
.end())
1949 if (feature
== "swbreak+") {
1953 send("PacketSize=131072;");
1954 return end_packet();
1957 D(fprintf(stderr
, "Unsupported query %s\n", name
.c_str()));
1958 return send_packet("");
1961 void gdbserver_t::handle_packet(const std::vector
<uint8_t> &packet
)
1963 if (compute_checksum(packet
) != extract_checksum(packet
)) {
1964 fprintf(stderr
, "Received %ld-byte packet with invalid checksum\n", packet
.size());
1965 fprintf(stderr
, "Computed checksum: %x\n", compute_checksum(packet
));
1966 print_packet(packet
);
1971 D(fprintf(stderr
, "Received %ld-byte packet from debug client: ", packet
.size()));
1972 D(print_packet(packet
));
1975 switch (packet
[1]) {
1977 return handle_extended(packet
);
1979 return handle_halt_reason(packet
);
1981 return handle_general_registers_read(packet
);
1983 // return handle_kill(packet);
1985 return handle_memory_read(packet
);
1987 // return handle_memory_write(packet);
1989 return handle_memory_binary_write(packet
);
1991 return handle_register_read(packet
);
1993 return handle_register_write(packet
);
1995 return handle_continue(packet
);
1997 return handle_step(packet
);
2000 return handle_breakpoint(packet
);
2003 return handle_query(packet
);
2007 D(fprintf(stderr
, "** Unsupported packet: "));
2008 D(print_packet(packet
));
2012 void gdbserver_t::handle_interrupt()
2014 processor_t
*p
= sim
->get_core(0);
2015 add_operation(new halt_op_t(*this, true));
2018 void gdbserver_t::handle()
2020 if (client_fd
> 0) {
2021 processor_t
*p
= sim
->get_core(0);
2023 bool interrupt
= sim
->debug_module
.get_interrupt(0);
2025 if (!interrupt
&& !operation_queue
.empty()) {
2026 operation_t
*operation
= operation_queue
.front();
2027 if (operation
->step()) {
2028 operation_queue
.pop();
2033 bool halt_notification
= sim
->debug_module
.get_halt_notification(0);
2034 if (halt_notification
) {
2035 sim
->debug_module
.clear_halt_notification(0);
2036 add_operation(new halt_op_t(*this, true));
2046 if (operation_queue
.empty()) {
2047 this->process_requests();
2051 void gdbserver_t::send(const char* msg
)
2053 unsigned int length
= strlen(msg
);
2054 for (const char *c
= msg
; *c
; c
++)
2055 running_checksum
+= *c
;
2056 send_buf
.append((const uint8_t *) msg
, length
);
2059 void gdbserver_t::send(uint64_t value
)
2062 for (unsigned int i
= 0; i
< 8; i
++) {
2063 sprintf(buffer
, "%02x", (int) (value
& 0xff));
2069 void gdbserver_t::send(uint32_t value
)
2072 for (unsigned int i
= 0; i
< 4; i
++) {
2073 sprintf(buffer
, "%02x", (int) (value
& 0xff));
2079 void gdbserver_t::send(uint8_t value
)
2082 sprintf(buffer
, "%02x", (int) value
);
2086 void gdbserver_t::send_packet(const char* data
)
2094 void gdbserver_t::start_packet()
2097 running_checksum
= 0;
2100 void gdbserver_t::end_packet(const char* data
)
2106 char checksum_string
[4];
2107 sprintf(checksum_string
, "#%02x", running_checksum
);
2108 send(checksum_string
);