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Merge pull request #454 from Fabien-Chouteau/semihosting
Prototype of ARM semihosting support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
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| #include "semihosting.h" | ||
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| #include <stlink.h> | ||
| #include <stlink/logging.h> | ||
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| static int mem_read_u8(stlink_t *sl, uint32_t addr, uint8_t *data) | ||
| { | ||
| int offset = addr % 4; | ||
| int len = 4; | ||
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| if (sl == NULL || data == NULL) { | ||
| return -1; | ||
| } | ||
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| /* Read address and length must be aligned */ | ||
| if (stlink_read_mem32(sl, addr - offset, len) != 0) { | ||
| return -1; | ||
| } | ||
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| *data = sl->q_buf[offset]; | ||
| return 0; | ||
| } | ||
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| #ifdef UNUSED | ||
| static int mem_read_u16(stlink_t *sl, uint32_t addr, uint16_t *data) | ||
| { | ||
| int offset = addr % 4; | ||
| int len = (offset > 2 ? 8 : 4); | ||
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| if (sl == NULL || data == NULL) { | ||
| return -1; | ||
| } | ||
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| /* Read address and length must be aligned */ | ||
| if (stlink_read_mem32(sl, addr - offset, len) != 0) { | ||
| return -1; | ||
| } | ||
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| memcpy(data, &sl->q_buf[offset], sizeof(*data)); | ||
| return 0; | ||
| } | ||
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| static int mem_read_u32(stlink_t *sl, uint32_t addr, uint32_t *data) | ||
| { | ||
| int offset = addr % 4; | ||
| int len = (offset > 0 ? 8 : 4); | ||
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| if (sl == NULL || data == NULL) { | ||
| return -1; | ||
| } | ||
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| /* Read address and length must be aligned */ | ||
| if (stlink_read_mem32(sl, addr - offset, len) != 0) { | ||
| return -1; | ||
| } | ||
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| memcpy(data, &sl->q_buf[offset], sizeof(*data)); | ||
| return 0; | ||
| } | ||
| #endif | ||
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| static int mem_read(stlink_t *sl, uint32_t addr, uint8_t *data, uint16_t len) | ||
| { | ||
| int offset = addr % 4; | ||
| int read_len = len + offset; | ||
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| if (sl == NULL || data == NULL) { | ||
| return -1; | ||
| } | ||
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| /* Align read size */ | ||
| if ((read_len % 4) != 0) { | ||
| read_len += 4 - (read_len % 4); | ||
| } | ||
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| /* Read address and length must be aligned */ | ||
| if (stlink_read_mem32(sl, addr - offset, read_len) != 0) { | ||
| return -1; | ||
| } | ||
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| memcpy(data, &sl->q_buf[offset], len); | ||
| return 0; | ||
| } | ||
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| #define WRITE0_BUFFER_SIZE 64 | ||
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| int do_semihosting (stlink_t *sl, uint32_t r0, uint32_t r1, uint32_t *ret) { | ||
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| if (sl == NULL || ret == NULL) { | ||
| return -1; | ||
| } | ||
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| switch (r0) { | ||
| case SYS_WRITEC: | ||
| { | ||
| uint8_t c; | ||
| if (mem_read_u8(sl, r1, &c) == 0) { | ||
| fprintf(stderr, "%c", c); | ||
| } | ||
| break; | ||
| } | ||
| case SYS_WRITE0: | ||
| { | ||
| uint8_t buf[WRITE0_BUFFER_SIZE]; | ||
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| while (true) { | ||
| if (mem_read(sl, r1, buf, WRITE0_BUFFER_SIZE) != 0 ) { | ||
| return -1; | ||
| } | ||
| for (int i = 0; i < WRITE0_BUFFER_SIZE; i++) { | ||
| if (buf[i] == 0) { | ||
| return 0; | ||
| } | ||
| fprintf(stderr, "%c", buf[i]); | ||
| } | ||
| r1 += WRITE0_BUFFER_SIZE; | ||
| } | ||
| break; | ||
| } | ||
| default: | ||
| fprintf(stderr, "semihosting: unsupported call 0x%#x\n", r0); | ||
| return -1; | ||
| } | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| #ifndef _SEMIHOSTING_H_ | ||
| #define _SEMIHOSTING_H_ | ||
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| #include <stlink.h> | ||
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| #define SYS_OPEN 0x01 | ||
| #define SYS_CLOSE 0x02 | ||
| #define SYS_WRITEC 0x03 | ||
| #define SYS_WRITE0 0x04 | ||
| #define SYS_WRITE 0x05 | ||
| #define SYS_READ 0x06 | ||
| #define SYS_READC 0x07 | ||
| #define SYS_ISERROR 0x08 | ||
| #define SYS_ISTTY 0x09 | ||
| #define SYS_SEEK 0x0A | ||
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| #define SYS_FLEN 0x0C | ||
| #define SYS_TMPNAM 0x0D | ||
| #define SYS_REMOVE 0x0E | ||
| #define SYS_RENAME 0x0E | ||
| #define SYS_CLOCK 0x10 | ||
| #define SYS_TIME 0x11 | ||
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| #define SYS_ERRNO 0x13 | ||
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| #define SYS_GET_CMD 0x15 | ||
| #define SYS_HEAPINFO 0x16 | ||
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| #define SYS_ELAPSED 0x30 | ||
| #define SYS_TICKFREQ 0x31 | ||
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| int do_semihosting (stlink_t *sl, uint32_t r0, uint32_t r1, uint32_t *ret); | ||
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| #endif /* ! _SEMIHOSTING_H_ */ |