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rx-gdb-stub.c
1401 lines (1349 loc) · 48.4 KB
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rx-gdb-stub.c
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/***********************************************************************
* GDB stub for bare-metal Renesas RX target . *
* *
* Created by Maxim Salov *
* *
* This source code is offered for use in the public domain. You may *
* use, modify or distribute it freely. *
* *
* This code is distributed in the hope that it will be useful but *
* WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY *
* DISCLAIMED. This includes but is not limited to warranties of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
***********************************************************************/
#include <rx-gdb-stub.h>
#include <intrinsics.h>
#include <iodefine.h>
#include <isr_vectors.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
static void stub_rsp_handler (unsigned int signal);
static char stub_getchar (void);
static void stub_putchar (char c);
/*@unused@*/
static void stub_puts (const char *str);
#define SIGBREAK '\x03'
#define TARGET_SIGNAL_INT 2
#define TARGET_SIGNAL_TRAP 5
enum regnames
{
R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15,
USP, ISP, PSW, PC, INTB, BPSW, BPC, FINTV, FPSW, ACC,
NUM_REGS
};
/* Add some space to hold ACC high word */
static unsigned int registers[NUM_REGS + 1];
#define PSW_C_BIT (1U << 0)
#define PSW_Z_BIT (1U << 1)
#define PSW_S_BIT (1U << 2)
#define PSW_O_BIT (1U << 3)
#define PSW_C ((unsigned int)(0 != (registers[PSW] & PSW_C_BIT)))
#define PSW_Z ((unsigned int)(0 != (registers[PSW] & PSW_Z_BIT)))
#define PSW_S ((unsigned int)(0 != (registers[PSW] & PSW_S_BIT)))
#define PSW_O ((unsigned int)(0 != (registers[PSW] & PSW_O_BIT)))
/* Stack pointer provided by linker script.
It is used to get end of RAM area */
/*@external@*/
extern unsigned int _stack;
#define RAM_END ((void*)&_stack)
#define OPCODE_NOP 0x03
#define OPCODE_BRK 0x00
static const char hexchars[] = "0123456789abcdef";
#define BUFFER_SIZE 512
static char trx_buffer[BUFFER_SIZE + 1];
static unsigned char stepping = 0;
/*@null@*/
static unsigned char * stepping_brk_address = NULL;
static unsigned char stepping_brk_opcode = OPCODE_BRK;
__attribute__((naked))
static void save_context (void)
{
__asm__ __volatile__ (
"push r15 \n"
"mov.l %0, r15 \n"
";; Skip R0 \n"
"add %1, r15 \n"
";; Save registers R1-R14 \n"
"mov.l r1, [r15+] \n"
"mov.l r2, [r15+] \n"
"mov.l r3, [r15+] \n"
"mov.l r4, [r15+] \n"
"mov.l r5, [r15+] \n"
"mov.l r6, [r15+] \n"
"mov.l r7, [r15+] \n"
"mov.l r8, [r15+] \n"
"mov.l r9, [r15+] \n"
"mov.l r10, [r15+] \n"
"mov.l r11, [r15+] \n"
"mov.l r12, [r15+] \n"
"mov.l r13, [r15+] \n"
"mov.l r14, [r15+] \n"
";; Save R15 \n"
"pop r1 \n"
"mov.l r1, [r15+] \n"
";; Pop return address \n"
"pop r14 \n"
";; Pop PC (r2) & PSW (r3) \n"
"popm r2-r3 \n"
";; Save USP \n"
"mvfc usp, r4 \n"
"mov.l r4, [r15+] \n"
";; Save ISP \n"
"mvfc isp, r5 \n"
"mov.l r5, [r15+] \n"
";; Save PSW \n"
"mov.l r3, [r15+] \n"
";; Save PC \n"
"mov.l r2, [r15+] \n"
";; Save INTB \n"
"mvfc intb, r1 \n"
"mov.l r1, [r15+] \n"
";; Save BPSW \n"
"mvfc bpsw, r1 \n"
"mov.l r1, [r15+] \n"
";; Save BPC \n"
"mvfc bpc, r1 \n"
"mov.l r1, [r15+] \n"
";; Save FINTV \n"
"mvfc fintv, r1 \n"
"mov.l r1, [r15+] \n"
";; Save FPSW \n"
"mvfc fpsw, r1 \n"
"mov.l r1, [r15+] \n"
";; Save ACC low word \n"
"mvfacmi r1 \n"
"shll #16, r1 \n"
"mov.l r1, [r15+] \n"
";; Save ACC high word \n"
"mvfachi r1 \n"
"mov.l r1, [r15+] \n"
";; Set R0 according to U bit value \n"
"mov.l %0, r15 \n"
";; Test U bit in PSW \n"
"btst #17, r3 \n"
"bnz 1f \n"
"mov.l r5, 0[r15] \n"
"bra 2f \n"
"1: \n"
"mov.l r4, 0[r15] \n"
"2: \n"
";; Return from function \n"
"jmp r14 \n"
:: "i" (®isters), "i" (sizeof registers[0]));
}
__attribute__((naked))
static void restore_context_and_exit (void)
{
__asm__ __volatile__ (
";; Remove return address from stack \n"
"pop r15 \n"
";; Prepare to restore context \n"
"mov.l %0, r15 \n"
"mov.l [r15], r4 \n"
"add %1, r15 \n"
";; Restore ACC high word \n"
"mov.l [-r15], r1 \n"
"mvtachi r1\n"
";; Restore ACC high low \n"
"mov.l [-r15], r1 \n"
"mvtaclo r1\n"
";; Restore FPSW \n"
"mov.l [-r15], r1 \n"
"mvtc r1, fpsw \n"
";; Restore FINTV \n"
"mov.l [-r15], r1 \n"
"mvtc r1, fintv \n"
";; Restore BPC \n"
"mov.l [-r15], r1 \n"
"mvtc r1, bpc \n"
";; Restore BPSW \n"
"mov.l [-r15], r1 \n"
"mvtc r1, bpsw \n"
";; Restore INTB \n"
"mov.l [-r15], r1 \n"
"mvtc r1, intb \n"
";; Restore PC \n"
"mov.l [-r15], r2 \n"
";; Restore PSW \n"
"mov.l [-r15], r3 \n"
";; Read ISP \n"
"mov.l [-r15], r5 \n"
";; Read USP \n"
"mov.l [-r15], r6 \n"
";; Set ISP/USP equal to R0 \n"
";; Test U bit in PSW \n"
"btst #17, r3 \n"
"bnz 1f \n"
"mov.l r4, r5 \n"
"bra 2f \n"
"1: \n"
"mov.l r4, r6 \n"
"2: \n"
";; Restore ISP & USP \n"
"mvtc r5, isp \n"
"mvtc r6, usp \n"
";; Push PC (r2) & PSW (r3) \n"
"pushm r2-r3 \n"
";; Read r15 and save it on stack \n"
"mov.l [-r15], r1 \n"
"push r1 \n"
";; Restore registers r14-r1 \n"
"mov.l [-r15], r14 \n"
"mov.l [-r15], r13 \n"
"mov.l [-r15], r12 \n"
"mov.l [-r15], r11 \n"
"mov.l [-r15], r10 \n"
"mov.l [-r15], r9 \n"
"mov.l [-r15], r8 \n"
"mov.l [-r15], r7 \n"
"mov.l [-r15], r6 \n"
"mov.l [-r15], r5 \n"
"mov.l [-r15], r4 \n"
"mov.l [-r15], r3 \n"
"mov.l [-r15], r2 \n"
"mov.l [-r15], r1 \n"
";; Restore r15 from stack \n"
"pop r15 \n"
";; Return from exception \n"
"rte \n"
:: "i" (®isters), "i" (sizeof registers));
}
static unsigned int get_next_pc (void)
/*@modifies nothing@*/
/*@globals registers@*/
{
const unsigned char * const pc = (unsigned char*)registers[PC];
const unsigned char * next_pc = pc;
unsigned int opcode = *pc;
/* Parse first byte of instruction */
if (0x02 == opcode) /* 00000010 1 RTS */
{
unsigned int *sp = (unsigned int*)registers[R0];
next_pc = (unsigned char*)*sp;
}
else if (0x03 == opcode) /* 00000011 1 NOP */
{
next_pc = pc + 1;
}
else if (0x04 == opcode || /* 00000100 4 BRA 4 */
0x05 == opcode) /* 00000101 4 BSR 2 */
{
unsigned int dsp = ((unsigned int)pc[1] << 0) |
((unsigned int)pc[2] << 8) |
((unsigned int)pc[3] << 16);
if (0 != (dsp & 0x00800000U)) /* If displacement is negative - extend the sign */
{
dsp |= 0xFF000000U;
}
next_pc = pc + (signed int)dsp;
}
else if (0x06 == opcode) /* 00000110 some kind of memory extended instruction
00000110 xx0000xx 3+ SUB 2x
00000110 xx0001xx 3+ CMP 4x
00000110 xx0010xx 3+ ADD 2x
00000110 xx0011xx 3+ MUL 3x
00000110 xx0100xx 3+ AND 3x
00000110 xx0101xx 3+ OR 3x
00000110 101000xx 4+ SBB 2
00000110 xx1000xx 4+ ADC 3
00000110 xx1000xx 4+ DIV 2x
00000110 xx1000xx 4+ DIVU 2x
00000110 xx1000xx 4+ EMUL 2x
00000110 xx1000xx 4+ EMULU 2x
00000110 xx1000xx 4+ ITOF 1x
00000110 xx1000xx 4+ MAX 2x
00000110 xx1000xx 4+ MIN 2x
00000110 xx1000xx 4+ TST 2x
00000110 xx1000xx 4+ XCHG 1x
00000110 xx1000xx 4+ XOR 2x
*/
{
unsigned int byte1 = pc[1];
unsigned int ld = byte1 & 0x03U;
if (3U == ld)
{
ld = 0;
}
if (0 != (byte1 & 0x20U))
{
++ld;
}
next_pc = pc + 3 + ld;
}
else if ((0xF8 & opcode) == 0x08) /* 00001xxx 1 BRA 1 */
{
unsigned int dsp = opcode & 0x07;
if (dsp < 3)
{
dsp += 8;
}
next_pc = pc + dsp;
}
else if ((0xF0 & opcode) == 0x10) /* 0001xxxx 1 BCnd 1 */
{
/* Condition:
0: BEQ, BZ
1: BNE, BNZ */
unsigned int cnd = ((opcode & 0x80) != 0);
unsigned int dsp = 1;
if (cnd != PSW_Z)
{
dsp = opcode & 0x03;
if (dsp < 3)
{
dsp += 8;
}
}
next_pc = pc + dsp;
}
else if (0x2E == opcode) /* 00101110 2 BRA 2 */
{
int dsp = (int)(signed char)pc[1];
next_pc = pc + dsp;
}
else if ((0xF0 & opcode) == 0x20) /* 0010xxxx 2 BCnd 2 */
{
unsigned int branch = 0;
unsigned int cnd = opcode & 0x0F;
switch (cnd)
{
case 0x00: /* BEQ, BZ */
case 0x01: /* BNE, BNZ */
{
if ((0 == cnd) == PSW_Z)
{
branch = 1;
}
break;
}
case 0x02: /* BGEU, BC */
case 0x03: /* BLTU, BNC */
{
if ((0x02 == cnd) == PSW_C)
{
branch = 1;
}
break;
}
case 0x04: /* BGTU */
case 0x05: /* BLEU */
{
unsigned int gtu = PSW_C && !PSW_Z;
if ((0x04 == cnd) == gtu)
{
branch = 1;
}
break;
}
case 0x06: /* BPZ */
case 0x07: /* BN */
{
if ((0x07 == cnd) == PSW_S)
{
branch = 1;
}
break;
}
case 0x08: /* BGE */
case 0x09: /* BLT */
{
unsigned int lt = PSW_S ^ PSW_O;
if ((0x09 == cnd) == lt)
{
branch = 1;
}
break;
}
case 0x0A: /* BGT */
case 0x0B: /* BLE */
{
unsigned int le = (PSW_S ^ PSW_O) || PSW_Z;
if ((0x0B == cnd) == le)
{
branch = 1;
}
break;
}
case 0x0C: /* BO */
case 0x0D: /* BNO */
{
if ((0x0C == cnd) == PSW_O)
{
branch = 1;
}
break;
}
case 0x0E: /* BRA 2 (00101110) */
case 0x0F: /* Reserved */
default:
/* Wrong opcode */
break;
}
{
int dsp = 2;
if (branch)
{
dsp = (int)(signed char)pc[1];
}
next_pc = pc + dsp;
}
}
else if (0x38 == opcode || /* 00111000 3 BRA 3 */
0x39 == opcode) /* 00111001 3 BSR 1 */
{
int dsp = (int)(short int)(((unsigned int)pc[1] << 0) |
((unsigned int)pc[2] << 8));
next_pc = pc + dsp;
}
else if ((0xFE & opcode) == 0x3A) /* 0011101x 3 BCnd 3 */
{
/* Condition:
0: BEQ, BZ
1: BNE, BNZ */
unsigned int cnd = ((opcode & 0x01) != 0);
signed int dsp = 3;
if (cnd != PSW_Z)
{
dsp = (int)(short int)(((unsigned int)pc[1] << 0) |
((unsigned int)pc[2] << 8));
}
next_pc = pc + dsp;
}
else if (0x3F == opcode) /* 00111111 3 RTSD 2 */
{
unsigned int *sp = (unsigned int*)registers[R0];
unsigned int offset = pc[2];
next_pc = (unsigned char*)sp[offset];
}
else if ((0xFC & opcode) == 0x3C) /* 001111xx 3 MOV 4 */
{
next_pc = pc + 3;
}
else if ((0xE0 & opcode) == 0x40) /* 010xxxxx group of commands:
010000xx 2+ SUB 2
010001xx 2+ CMP 4
010010xx 2+ ADD 2
010011xx 2+ MUL 3
010100xx 2+ AND 3
010101xx 2+ OR 3
01011xxx 2+ MOVU 2
*/
{
unsigned int ld = opcode & 0x03;
if (0x03 == ld)
{
ld = 0;
}
next_pc = pc + 2 + ld;
}
else if (0x67 == opcode) /* 01100111 2 RTSD 1 */
{
unsigned int *sp = (unsigned int*)registers[R0];
unsigned int offset = pc[1];
next_pc = (unsigned char*)sp[offset];
}
else if ((0xF0 & opcode) == 0x60) /* 0110xxxx group of commands:
01100000 2 SUB 1
01100001 2 CMP 1
01100010 2 ADD 1
01100011 2 MUL 1
01100100 2 AND 1
01100101 2 OR 1
01100110 2 MOV 3
01100111 2 RTSD 1 - already processed
0110100x 2 SHLR 1
0110101x 2 SHAR 1
0110110x 2 SHLL 1
01101110 2 PUSHM
01101111 2 POPM
*/
{
next_pc = pc + 2;
}
else if (0x75 == opcode) /* 01110101 3 INT */
{
unsigned int *intb = (unsigned int*)registers[INTB];
unsigned int n = pc[2];
next_pc = (unsigned char*)intb[n];
}
else if ((0xF8 & opcode) == 0x70) /* 01110xxx group of commands:
011100xx 3+ ADD 3
01110101 3 CMP 2
01110101 3 INT - already processed
01110101 3 MOV 5
01110101 3 MVTIPL
011101xx 3+ AND 2
011101xx 3+ CMP 3
011101xx 3+ MUL 2
011101xx 3+ OR 2
*/
{
unsigned int li = (opcode & 0x03);
if (0x03 == li)
{
li = 4;
}
next_pc = pc + 2 + li;
}
else if ((0xFC & opcode) == 0x78 || /* 011110xx
0111100x 2 BSET 3
0111101x 2 BCLR 3
*/
(0xFE & opcode) == 0x7C || /* 0111110x 2 BTST 3 */
0x7E == opcode) /* 01111110 2 ABS 1
01111110 2 NEG 1
01111110 2 NOT 1
01111110 2 POP
01111110 2 POPC
01111110 2 PUSH 1
01111110 2 PUSHC
01111110 2 ROLC
01111110 2 RORC
01111110 2 SAT
*/
{
next_pc = pc + 2;
}
else if (0x7F == opcode) /* 01111111
01111111 0000xxxx 2 JMP
01111111 0001xxxx 2 JSR
01111111 0101xxxx 2 BSR 3
01111111 10000011 2 SCMPU
01111111 100000xx 2 SUNTIL
01111111 10000111 2 SMOVU
01111111 100001xx 2 SWHILE
01111111 10001011 2 SMOVB
01111111 100010xx 2 SSTR
01111111 10001111 2 SMOVF
01111111 100011xx 2 RMPA
01111111 10010011 2 SATR
01111111 10010100 2 RTFI
01111111 10010101 2 RTE
01111111 10010110 2 WAIT
01111111 1010xxxx 2 SETPSW
01111111 1011xxxx 2 CLRPSW
*/
{
unsigned int byte1 = pc[1];
if ((0xE0 & byte1) == 0x00) /* 01111111 000xxxxx
01111111 0000xxxx 2 JMP
01111111 0001xxxx 2 JSR
*/
{
unsigned int rs = byte1 & 0x0F;
next_pc = (unsigned char*)registers[rs];
}
else if ((0xF0 & byte1) == 0x50) /* 01111111 0101xxxx 2 BSR 3 */
{
unsigned int rs = byte1 & 0x0F;
next_pc = pc + (signed int)registers[rs];
}
else if (0x94 == byte1) /* 01111111 10010100 2 RTFI */
{
unsigned char *bpc = (unsigned char*)registers[BPC];
next_pc = bpc;
}
else if (0x95 == byte1) /* 01111111 10010101 2 RTE */
{
unsigned int *sp = (unsigned int*)registers[ISP];
next_pc = (unsigned char*)sp[0];
}
else /* All other instructions from this group */
{
next_pc = pc + 2;
}
}
else if ((0xC0 & opcode) == 0x80) /* 10xxxxxx
1011xxxx 2 MOVU 1
10xx0xxx 2 MOV 1
10xx1xxx 2 MOV 2
*/
{
next_pc = pc + 2;
}
else if (0xFC == opcode) /* 11111100
11111100 00000011 3 SBB 1
11111100 00000111 3 NEG 2
11111100 00001011 3 ADC 2
11111100 00001111 3 ABS 2
11111100 00111011 3 NOT 2
11111100 01100011 3 BSET 4
11111100 01100111 3 BCLR 4
11111100 01101011 3 BTST 4
11111100 01101111 3 BNOT 4
11111100 000100xx 3+ MAX 2
11111100 000101xx 3+ MIN 2
11111100 000110xx 3+ EMUL 2
11111100 000111xx 3+ EMULU 2
11111100 001000xx 3+ DIV 2
11111100 001001xx 3+ DIVU 2
11111100 001100xx 3+ TST 2
11111100 001101xx 3+ XOR 2
11111100 010000xx 3+ XCHG 1
11111100 010001xx 3+ ITOF 1
11111100 011000xx 3+ BSET 2
11111100 011001xx 3+ BCLR 2
11111100 011010xx 3+ BTST 2
11111100 011011xx 3+ BNOT 2
11111100 100000xx 3+ FSUB 2
11111100 100001xx 3+ FCMP 2
11111100 100010xx 3+ FADD 2
11111100 100011xx 3+ FMUL 2
11111100 100100xx 3+ FDIV 2
11111100 100101xx 3+ FTOI
11111100 100110xx 3+ ROUND
11111100 1101xxxx 3+ SCCnd
11111100 111xxxxx 3+ BMCnd 1
11111100 111xxxxx 3+ BNOT 1
*/
{
unsigned int ld = pc[1] & 0x03;
if (3 == ld)
{
ld = 0;
}
next_pc = pc + 3 + ld;
}
else if (0xFD == opcode) /* 11111101 */
{
unsigned int byte1 = pc[1];
if (0x72 == byte1) /* 11111101 01110010 7 FADD 1
11111101 01110010 7 FCMP 1
11111101 01110010 7 FDIV 1
11111101 01110010 7 FMUL 1
11111101 01110010 7 FSUB 1
*/
{
next_pc = pc + 7;
}
else if ((0xF3 & byte1) == 0x70 || /* 11111101 0111xx00 4+ ADC 1
11111101 0111xx00 4+ DIV 1
11111101 0111xx00 4+ DIVU 1
11111101 0111xx00 4+ EMUL 1
11111101 0111xx00 4+ EMULU 1
11111101 0111xx00 4+ MAX 1
11111101 0111xx00 4+ MIN 1
11111101 0111xx00 4+ STNZ
11111101 0111xx00 4+ STZ
11111101 0111xx00 4+ TST 1
11111101 0111xx00 4+ XOR 1
*/
(0xF3 & byte1) == 0x73) /* 11111101 0111xx11 4+ MVTC 1 */
{
unsigned int li = byte1 & 0x03;
if (0 == li)
{
li = 4;
}
next_pc = pc + 3 + li;
}
else /* 11111101 100xxxxx 3 SHLR 3
11111101 101xxxxx 3 SHAR 3
11111101 110xxxxx 3 SHLL 3
11111101 111xxxxx 3 BMCnd 2
11111101 111xxxxx 3 BNOT 3
11111101 00000000 3 MULHI
11111101 00000001 3 MULLO
11111101 00000100 3 MACHI
11111101 00000101 3 MACLO
11111101 00010111 3 MVTACHI
11111101 00010111 3 MVTACLO
11111101 00011000 3 RACW
11111101 00011111 3 MVFACHI
11111101 00011111 3 MVFACMI
11111101 0010xxxx 3 MOV 14
11111101 0010xxxx 3 MOV 15
11111101 0011xx0x 3 MOVU 4
11111101 01100000 3 SHLR 2
11111101 01100001 3 SHAR 2
11111101 01100010 3 SHLL 2
11111101 01100100 3 ROTR 2
11111101 01100101 3 REVW
11111101 01100110 3 ROTL 2
11111101 01100111 3 REVL
11111101 01101000 3 MVTC 2
11111101 01101010 3 MVFC
11111101 0110110x 3 ROTR 1
11111101 0110111x 3 ROTL 1
*/
{
next_pc = pc + 3;
}
}
else if ((0xFE & opcode) == 0xFE) /* 1111111x
11111110 3 MOV 10
11111110 3 MOV 12
11111110 3 MOVU 3
11111111 3 ADD 4
11111111 3 ADD 4
11111111 3 MUL 4
11111111 3 OR 4
11111111 3 SUB 3
*/
{
next_pc = pc + 3;
}
else if ((0xF8 & opcode) == 0xF0) /* 11110xxx
111100xx 2+ BCLR 1
111100xx 2+ BSET 1
111101xx 2+ BTST 1
111101xx 2+ PUSH 2
*/
{
unsigned int ld = opcode & 0x03;
next_pc = pc + 2 + ld;
}
else if (0xFB == opcode) /* 11111011 3+ MOV 6 */
{
unsigned int li = (pc[1] >> 2) & 0x03;
if (0 == li)
{
li = 4;
}
next_pc = pc + 2 + li;
}
else if ((0xFE & opcode) == 0xF8) /* 111110xx 3+ MOV 8 */
{
unsigned int ld = opcode & 0x03;
unsigned int li = (pc[1] >> 2) & 0x03;
if (0 == li)
{
li = 4;
}
next_pc = pc + 2 + ld + li;
}
else if ((0xC0 & opcode) == 0xC0) /* 11xxxxxx
11xx1111 2 MOV 7
11xx11xx 2+ MOV 9
11xxxx11 2+ MOV 11
11xxxxxx 2+ MOV 13
*/
{
unsigned int lds = opcode & 0x03;
unsigned int ldd = (opcode >> 2) & 0x03;
if (3 == lds)
{
lds = 0;
}
if (3 == ldd)
{
ldd = 0;
}
next_pc = pc + 2 + lds + ldd;
}
else
{
/* Unknown opcode */
}
return (unsigned int)next_pc;
}
static unsigned int char2int (char c)
{
if ('0' <= c &&
'9' >= c)
{
return c - '0';
}
else if ('a' <= c &&
'f' >= c)
{
return c - 'a' + 10U;
}
else if ('A' <= c &&
'F' >= c)
{
return c - 'A' + 10U;
}
else
{
return UINT_MAX;
}
}
static unsigned int hex2int (const char *src, /*@null@*/ const char **p)
/*@globals nothing@*/
/*@modifies *p@*/
{
unsigned int val = 0U;
unsigned int nibble = 0U;
unsigned int count = 0U;
const char *s = src;
while (UINT_MAX != (nibble = char2int(*s)) &&
count < (sizeof(val) * 2))
{
val <<= 4U;
val += nibble;
++s;
++count;
}
if (NULL != p)
{
*p = s;
}
return val;
}
static void mem2hex_1 (char *dst, const void *src, size_t size)
{
size_t i;
const uint8_t *s = (const uint8_t*)src;
char *d = dst;
for (i = size; i; --i)
{
*d++ = hexchars[(*s >> 4) & 0x0F];
*d++ = hexchars[(*s >> 0) & 0x0F];
++s;
}
*d = '\0';
}
static void mem2hex_2 (char *dst, const void *src, size_t size)
{
size_t i;
const uint16_t *s = (const uint16_t*)src;
char *d = dst;
for (i = size; i; --i)
{
uint16_t tmp = *s;
mem2hex_1(d, &tmp, sizeof tmp);
d += sizeof(tmp) * 2;
++s;
}
}
static void mem2hex_4 (char *dst, const void *src, size_t size)
{
size_t i;
const uint32_t *s = (const uint32_t*)src;
char *d = dst;
for (i = size; i; --i)
{
uint32_t tmp = *s;
mem2hex_1(d, &tmp, sizeof tmp);
d += sizeof(tmp) * 2;
++s;
}
}
static void mem2hex (char *dst, const void *src, size_t size)
{
if (0 == ((uint32_t)src % 4)
&& 0 == (size % 4))
{
mem2hex_4(dst, src, size / 4);
}
else if (0 == ((uint32_t)src % 2)
&& 0 == (size % 2))
{
mem2hex_2(dst, src, size / 2);
}
else
{
mem2hex_1(dst, src, size);
}
}
static void hex2mem_1 (/*@out@*/ uint8_t *dst, const char *src, size_t size)
{
size_t i;
const char *s = src;
uint8_t *d = dst;
for (i = size; i; --i)
{
unsigned int tmp;
tmp = char2int(*s++) << 4;
tmp += char2int(*s++);
*d = tmp;
++d;
}
}
static void hex2mem_2 (/*@out@*/ uint16_t *dst, const char *src, size_t size)
{
size_t i;
const char *s = src;
uint16_t *d = dst;
for (i = size; i; --i)
{
uint16_t tmp;
hex2mem_1((uint8_t*)&tmp, s, sizeof tmp);
*d = tmp;
s += sizeof(tmp) * 2;
++d;
}
}
static void hex2mem_4 (/*@out@*/ uint32_t *dst, const char *src, size_t size)
{
size_t i;
const char *s = src;
uint32_t *d = dst;
for (i = size; i; --i)
{
uint32_t tmp;
hex2mem_1((uint8_t*)&tmp, s, sizeof tmp);
*d = tmp;
s += sizeof(tmp) * 2;
++d;
}
}
static void hex2mem (/*@out@*/ void *dst, const char *src, size_t size)
{
if (0 == ((uint32_t)dst % 4)
&& 0 == (size % 4))
{
hex2mem_4(dst, src, size / 4);
}
else if (0 == ((uint32_t)dst % 2)
&& 0 == (size % 2))
{
hex2mem_2(dst, src, size / 2);
}
else
{
hex2mem_1(dst, src, size);
}
}
static void get_packet(void)
{
char c = '\0';
/* Retry until correct packet is received */
for (;;)
{
unsigned int checksum = 0;
unsigned int count = 0;
char *rxp = trx_buffer;
/* Wait for start byte */
while ('$' != c)
{
c = stub_getchar();
}
/* Receive packet payload */
while (BUFFER_SIZE > count)
{
c = stub_getchar();
if ('$' == c ||
'#' == c)
{
/*@innerbreak@*/
break;
}
checksum += c;
count += 1;
*rxp++ = c;
}
*rxp = '\0';
/* Receive and verify checksum */
if ('#' == c)
{
unsigned int received_checksum = 0;
received_checksum += char2int(stub_getchar()) << 4;
received_checksum += char2int(stub_getchar());
checksum &= 0x00FF;
if (checksum == received_checksum)
{
stub_putchar('+');
break;
}
else
{
stub_putchar('-');
}
}
}
}
static void put_packet (const char *buffer)
{
do
{
const char *p = buffer;
unsigned int checksum = 0;
stub_putchar('$');
while ('\0' != *p)
{
stub_putchar(*p);
checksum += *p;
++p;
}
stub_putchar('#');
stub_putchar(hexchars[(checksum >> 4) & 0x0F]);
stub_putchar(hexchars[(checksum >> 0) & 0x0F]);
}
while ('+' != stub_getchar());
}
static void start_step (void)