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linux-davinci-2.6.23
Commit fc31b809 authored by Paul Mundt's avatar Paul Mundt Committed by Paul Mundt
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sh: Rip out broken kgdb thread support. 

The kgdb thread support is woefully out of date (it predates
the pidhash), and needs a complete rewrite before it's useful
again. Just rip it out entirely.

Updating the unified kgdb stub is a more worthwhile endeavour
for anyone that happens to be interested in this, at present
it's just limping along.
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent fa5da2f7
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Showing with 4 additions and 386 deletions
arch/sh/Kconfig.debug
View file @ fc31b809
......@@ -104,10 +104,6 @@ config KGDB_NMI
bool "Enter KGDB on NMI"
default n
config KGDB_THREAD
bool "Include KGDB thread support"
default y
config SH_KGDB_CONSOLE
bool "Console messages through GDB"
depends on !SERIAL_SH_SCI_CONSOLE
......
arch/sh/kernel/kgdb_stub.c
View file @ fc31b809
......@@ -243,14 +243,6 @@ static char out_buffer[OUTBUFMAX];
static void kgdb_to_gdb(const char *s);
#ifdef CONFIG_KGDB_THREAD
static struct task_struct *trapped_thread;
static struct task_struct *current_thread;
typedef unsigned char threadref[8];
#define BUF_THREAD_ID_SIZE 16
#endif
/* Convert ch to hex */
static int hex(const char ch)
{
......@@ -346,66 +338,6 @@ static char *pack_hex_byte(char *pkt, int byte)
return pkt;
}
#ifdef CONFIG_KGDB_THREAD
/* Pack a thread ID */
static char *pack_threadid(char *pkt, threadref * id)
{
char *limit;
unsigned char *altid;
altid = (unsigned char *) id;
limit = pkt + BUF_THREAD_ID_SIZE;
while (pkt < limit)
pkt = pack_hex_byte(pkt, *altid++);
return pkt;
}
/* Convert an integer into our threadref */
static void int_to_threadref(threadref * id, const int value)
{
unsigned char *scan = (unsigned char *) id;
int i = 4;
while (i--)
*scan++ = 0;
*scan++ = (value >> 24) & 0xff;
*scan++ = (value >> 16) & 0xff;
*scan++ = (value >> 8) & 0xff;
*scan++ = (value & 0xff);
}
/* Return a task structure ptr for a particular pid */
static struct task_struct *get_thread(int pid)
{
struct task_struct *thread;
/* Use PID_MAX w/gdb for pid 0 */
if (pid == PID_MAX) pid = 0;
/* First check via PID */
thread = find_task_by_pid(pid);
if (thread)
return thread;
/* Start at the start */
thread = init_tasks[0];
/* Walk along the linked list of tasks */
do {
if (thread->pid == pid)
return thread;
thread = thread->next_task;
} while (thread != init_tasks[0]);
return NULL;
}
#endif /* CONFIG_KGDB_THREAD */
/* Scan for the start char '$', read the packet and check the checksum */
static void get_packet(char *buffer, int buflen)
{
......@@ -608,74 +540,6 @@ static void gdb_regs_to_kgdb_regs(const int *gdb_regs,
regs->vbr = gdb_regs[VBR];
}
#ifdef CONFIG_KGDB_THREAD
/* Make a local copy of registers from the specified thread */
asmlinkage void ret_from_fork(void);
static void thread_regs_to_gdb_regs(const struct task_struct *thread,
int *gdb_regs)
{
int regno;
int *tregs;
/* Initialize to zero */
for (regno = 0; regno < MAXREG; regno++)
gdb_regs[regno] = 0;
/* Just making sure... */
if (thread == NULL)
return;
/* A new fork has pt_regs on the stack from a fork() call */
if (thread->thread.pc == (unsigned long)ret_from_fork) {
int vbr_val;
struct pt_regs *kregs;
kregs = (struct pt_regs*)thread->thread.sp;
gdb_regs[R0] = kregs->regs[R0];
gdb_regs[R1] = kregs->regs[R1];
gdb_regs[R2] = kregs->regs[R2];
gdb_regs[R3] = kregs->regs[R3];
gdb_regs[R4] = kregs->regs[R4];
gdb_regs[R5] = kregs->regs[R5];
gdb_regs[R6] = kregs->regs[R6];
gdb_regs[R7] = kregs->regs[R7];
gdb_regs[R8] = kregs->regs[R8];
gdb_regs[R9] = kregs->regs[R9];
gdb_regs[R10] = kregs->regs[R10];
gdb_regs[R11] = kregs->regs[R11];
gdb_regs[R12] = kregs->regs[R12];
gdb_regs[R13] = kregs->regs[R13];
gdb_regs[R14] = kregs->regs[R14];
gdb_regs[R15] = kregs->regs[R15];
gdb_regs[PC] = kregs->pc;
gdb_regs[PR] = kregs->pr;
gdb_regs[GBR] = kregs->gbr;
gdb_regs[MACH] = kregs->mach;
gdb_regs[MACL] = kregs->macl;
gdb_regs[SR] = kregs->sr;
asm("stc vbr, %0":"=r"(vbr_val));
gdb_regs[VBR] = vbr_val;
return;
}
/* Otherwise, we have only some registers from switch_to() */
tregs = (int *)thread->thread.sp;
gdb_regs[R15] = (int)tregs;
gdb_regs[R14] = *tregs++;
gdb_regs[R13] = *tregs++;
gdb_regs[R12] = *tregs++;
gdb_regs[R11] = *tregs++;
gdb_regs[R10] = *tregs++;
gdb_regs[R9] = *tregs++;
gdb_regs[R8] = *tregs++;
gdb_regs[PR] = *tregs++;
gdb_regs[GBR] = *tregs++;
gdb_regs[PC] = thread->thread.pc;
}
#endif /* CONFIG_KGDB_THREAD */
/* Calculate the new address for after a step */
static short *get_step_address(void)
{
......@@ -794,37 +658,11 @@ static void undo_single_step(void)
/* Send a signal message */
static void send_signal_msg(const int signum)
{
#ifndef CONFIG_KGDB_THREAD
out_buffer[0] = 'S';
out_buffer[1] = highhex(signum);
out_buffer[2] = lowhex(signum);
out_buffer[3] = 0;
put_packet(out_buffer);
#else /* CONFIG_KGDB_THREAD */
int threadid;
threadref thref;
char *out = out_buffer;
const char *tstring = "thread";
*out++ = 'T';
*out++ = highhex(signum);
*out++ = lowhex(signum);
while (*tstring) {
*out++ = *tstring++;
}
*out++ = ':';
threadid = trapped_thread->pid;
if (threadid == 0) threadid = PID_MAX;
int_to_threadref(&thref, threadid);
pack_threadid(out, &thref);
out += BUF_THREAD_ID_SIZE;
*out++ = ';';
*out = 0;
put_packet(out_buffer);
#endif /* CONFIG_KGDB_THREAD */
}
/* Reply that all was well */
......@@ -959,15 +797,7 @@ static void step_with_sig_msg(void)
/* Send register contents */
static void send_regs_msg(void)
{
#ifdef CONFIG_KGDB_THREAD
if (!current_thread)
kgdb_regs_to_gdb_regs(&trap_registers, registers);
else
thread_regs_to_gdb_regs(current_thread, registers);
#else
kgdb_regs_to_gdb_regs(&trap_registers, registers);
#endif
mem_to_hex((char *) registers, out_buffer, NUMREGBYTES);
put_packet(out_buffer);
}
......@@ -975,198 +805,11 @@ static void send_regs_msg(void)
/* Set register contents - currently can't set other thread's registers */
static void set_regs_msg(void)
{
#ifdef CONFIG_KGDB_THREAD
if (!current_thread) {
#endif
kgdb_regs_to_gdb_regs(&trap_registers, registers);
hex_to_mem(&in_buffer[1], (char *) registers, NUMREGBYTES);
gdb_regs_to_kgdb_regs(registers, &trap_registers);
send_ok_msg();
#ifdef CONFIG_KGDB_THREAD
} else
send_err_msg();
#endif
}
#ifdef CONFIG_KGDB_THREAD
/* Set the status for a thread */
void set_thread_msg(void)
{
int threadid;
struct task_struct *thread = NULL;
char *ptr;
switch (in_buffer[1]) {
/* To select which thread for gG etc messages, i.e. supported */
case 'g':
ptr = &in_buffer[2];
hex_to_int(&ptr, &threadid);
thread = get_thread(threadid);
/* If we haven't found it */
if (!thread) {
send_err_msg();
break;
}
/* Set current_thread (or not) */
if (thread == trapped_thread)
current_thread = NULL;
else
current_thread = thread;
send_ok_msg();
break;
/* To select which thread for cCsS messages, i.e. unsupported */
case 'c':
send_ok_msg();
break;
default:
send_empty_msg();
break;
}
}
/* Is a thread alive? */
static void thread_status_msg(void)
{
char *ptr;
int threadid;
struct task_struct *thread = NULL;
ptr = &in_buffer[1];
hex_to_int(&ptr, &threadid);
thread = get_thread(threadid);
if (thread)
send_ok_msg();
else
send_err_msg();
}
/* Send the current thread ID */
static void thread_id_msg(void)
{
int threadid;
threadref thref;
out_buffer[0] = 'Q';
out_buffer[1] = 'C';
if (current_thread)
threadid = current_thread->pid;
else if (trapped_thread)
threadid = trapped_thread->pid;
else /* Impossible, but just in case! */
{
send_err_msg();
return;
}
/* Translate pid 0 to PID_MAX for gdb */
if (threadid == 0) threadid = PID_MAX;
int_to_threadref(&thref, threadid);
pack_threadid(out_buffer + 2, &thref);
out_buffer[2 + BUF_THREAD_ID_SIZE] = '\0';
put_packet(out_buffer);
}
/* Send thread info */
static void thread_info_msg(void)
{
struct task_struct *thread = NULL;
int threadid;
char *pos;
threadref thref;
/* Start with 'm' */
out_buffer[0] = 'm';
pos = &out_buffer[1];
/* For all possible thread IDs - this will overrun if > 44 threads! */
/* Start at 1 and include PID_MAX (since GDB won't use pid 0...) */
for (threadid = 1; threadid <= PID_MAX; threadid++) {
read_lock(&tasklist_lock);
thread = get_thread(threadid);
read_unlock(&tasklist_lock);
/* If it's a valid thread */
if (thread) {
int_to_threadref(&thref, threadid);
pack_threadid(pos, &thref);
pos += BUF_THREAD_ID_SIZE;
*pos++ = ',';
}
}
*--pos = 0; /* Lose final comma */
put_packet(out_buffer);
}
/* Return printable info for gdb's 'info threads' command */
static void thread_extra_info_msg(void)
{
int threadid;
struct task_struct *thread = NULL;
char buffer[20], *ptr;
int i;
/* Extract thread ID */
ptr = &in_buffer[17];
hex_to_int(&ptr, &threadid);
thread = get_thread(threadid);
/* If we don't recognise it, say so */
if (thread == NULL)
strcpy(buffer, "(unknown)");
else
strcpy(buffer, thread->comm);
/* Construct packet */
for (i = 0, ptr = out_buffer; buffer[i]; i++)
ptr = pack_hex_byte(ptr, buffer[i]);
if (thread->thread.pc == (unsigned long)ret_from_fork) {
strcpy(buffer, "<new fork>");
for (i = 0; buffer[i]; i++)
ptr = pack_hex_byte(ptr, buffer[i]);
}
*ptr = '\0';
put_packet(out_buffer);
}
/* Handle all qFooBarBaz messages - have to use an if statement as
opposed to a switch because q messages can have > 1 char id. */
static void query_msg(void)
{
const char *q_start = &in_buffer[1];
/* qC = return current thread ID */
if (strncmp(q_start, "C", 1) == 0)
thread_id_msg();
/* qfThreadInfo = query all threads (first) */
else if (strncmp(q_start, "fThreadInfo", 11) == 0)
thread_info_msg();
/* qsThreadInfo = query all threads (subsequent). We know we have sent
them all after the qfThreadInfo message, so there are no to send */
else if (strncmp(q_start, "sThreadInfo", 11) == 0)
put_packet("l"); /* el = last */
/* qThreadExtraInfo = supply printable information per thread */
else if (strncmp(q_start, "ThreadExtraInfo", 15) == 0)
thread_extra_info_msg();
/* Unsupported - empty message as per spec */
else
send_empty_msg();
kgdb_regs_to_gdb_regs(&trap_registers, registers);
hex_to_mem(&in_buffer[1], (char *) registers, NUMREGBYTES);
gdb_regs_to_kgdb_regs(registers, &trap_registers);
send_ok_msg();
}
#endif /* CONFIG_KGDB_THREAD */
#ifdef CONFIG_SH_KGDB_CONSOLE
/*
......@@ -1206,12 +849,6 @@ static void kgdb_command_loop(const int excep_code, const int trapa_value)
if (!kgdb_enabled)
return;
#ifdef CONFIG_KGDB_THREAD
/* Until GDB specifies a thread */
current_thread = NULL;
trapped_thread = current;
#endif
/* Enter GDB mode (e.g. after detach) */
if (!kgdb_in_gdb_mode) {
/* Do serial setup, notify user, issue preemptive ack */
......@@ -1284,21 +921,6 @@ static void kgdb_command_loop(const int excep_code, const int trapa_value)
step_msg();
return;
#ifdef CONFIG_KGDB_THREAD
case 'H': /* Task related */
set_thread_msg();
break;
case 'T': /* Query thread status */
thread_status_msg();
break;
case 'q': /* Handle query - currently thread-related */
query_msg();
break;
#endif
case 'k': /* 'Kill the program' with a kernel ? */
break;
......
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