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Fix: Semihosting in BMP #1686

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merged 2 commits into from
Nov 21, 2023
Merged

Fix: Semihosting in BMP #1686

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fac5c92
cortexm: Add names of semihosting syscalls to decode them in logs
ALTracer Nov 11, 2023
374f319
gdb_hostio: Expect other packets from GDB, leading to F-reply
ALTracer Nov 19, 2023
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14 changes: 12 additions & 2 deletions src/gdb_hostio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -73,8 +73,18 @@ int hostio_reply(target_controller_s *const tc, char *const pbuf, const int len)
static int hostio_get_response(target_controller_s *const tc)
{
char *const packet_buffer = gdb_packet_buffer();
const size_t size = gdb_getpacket(packet_buffer, GDB_PACKET_BUFFER_SIZE);
return gdb_main_loop(tc, packet_buffer, GDB_PACKET_BUFFER_SIZE, size, true);
/* Still have to service normal 'X'/'m'-packets */
while (true) {
/* Get back the next packet to process and have the main loop handle it */
const size_t size = gdb_getpacket(packet_buffer, GDB_PACKET_BUFFER_SIZE);
/* If this was an escape packet (or gdb_if reports link closed), fail the call */
if (size == 1U && packet_buffer[0] == '\x04')
return -1;
const int result = gdb_main_loop(tc, packet_buffer, GDB_PACKET_BUFFER_SIZE, size, true);
/* If this was an F-packet, we're done */
if (packet_buffer[0] == 'F')
return result;
}
}

/* Interface to host system calls */
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48 changes: 46 additions & 2 deletions src/target/cortexm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,42 @@ typedef struct cortexm_priv {
uint32_t demcr;
} cortexm_priv_s;

#ifdef ENABLE_DEBUG
const char *const semihosting_names[] = {
"",
"SYS_OPEN",
"SYS_CLOSE",
"SYS_WRITEC",
"SYS_WRITE0",
"SYS_WRITE",
"SYS_READ",
"SYS_READC",
"SYS_ISERROR",
"SYS_ISTTY",
"SYS_SEEK",
"0x0b",
"SYS_FLEN",
"SYS_TMPNAM",
"SYS_REMOVE",
"SYS_RENAME",
"SYS_CLOCK",
"SYS_TIME",
"SYS_SYSTEM",
"SYS_ERRNO",
"0x14",
"SYS_GET_CMDLINE",
"SYS_HEAPINFO",
"0x17",
[SEMIHOSTING_SYS_EXIT] = "SYS_EXIT",
/* 7 reserved */
[SEMIHOSTING_SYS_EXIT_EXTENDED] = "SYS_EXIT_EXTENDED",
/* 15 reserved */
[SEMIHOSTING_SYS_ELAPSED] = "SYS_ELAPSED",
[SEMIHOSTING_SYS_TICKFREQ] = "SYS_TICKFREQ",
"",
};
#endif

/* Register number tables */
static const uint32_t regnum_cortex_m[CORTEXM_GENERAL_REG_COUNT] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* standard r0-r15 */
Expand Down Expand Up @@ -1434,8 +1470,16 @@ static int cortexm_hostio_request(target_s *target)
target_mem_read(target, params, arm_regs[1], sizeof(params));
int32_t ret = 0;

DEBUG_INFO("syscall 0" PRIx32 "%" PRIx32 " (%" PRIx32 " %" PRIx32 " %" PRIx32 " %" PRIx32 ")\n", syscall, params[0],
params[1], params[2], params[3]);
#ifdef ENABLE_DEBUG
const char *syscall_descr = NULL;
if (syscall < ARRAY_LENGTH(semihosting_names))
syscall_descr = semihosting_names[syscall];
if (syscall_descr == NULL)
syscall_descr = "";

DEBUG_INFO("syscall %12s (%" PRIx32 " %" PRIx32 " %" PRIx32 " %" PRIx32 ")\n", syscall_descr, params[0], params[1],
params[2], params[3]);
#endif
switch (syscall) {
#if PC_HOSTED == 1

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