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tools/nuttx-gdbinit: improve experience of gdb backend scripts
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Redefine built-in command (info thread/thread/c) to compatible with developer habits

Test board:
./tools/configure.sh -E lm3s6965-ek:qemu-flat

1. start qemu:
qemu-system-arm   -M lm3s6965evb   -device loader,file=nuttx   -serial mon:stdio   -nographic  -s

2. gdb attach:
gdb-multiarch -ix tools/nuttx-gdbinit nuttx -ex "target extended-remote localhost:1234"

3. show thread info and callstack:

| (gdb) info thread
| * 0 Thread 0x20001548  (Name: Idle Task, State: Running, Priority: 0, Stack: 1000) PC: 0x9eee in up_idle()
|   1 Thread 0x20005058  (Name: hpwork, State: Waiting,Semaphore, Priority: 224, Stack: 1992) PC: 0xa124 in up_switch_context()
|   2 Thread 0x20005c20  (Name: nsh_main, State: Waiting,Semaphore, Priority: 100, Stack: 2000) PC: 0xa124 in up_switch_context()
|   3 Thread 0x20006b30  (Name: NTP daemon, State: Waiting,Semaphore, Priority: 100, Stack: 1952) PC: 0xa124 in up_switch_context()
|   4 Thread 0x200086f0  (Name: telnetd, State: Waiting,Semaphore, Priority: 100, Stack: 2008) PC: 0xa124 in up_switch_context()
| (gdb) bt
| #0  0x00009eee in up_idle () at chip/common/tiva_idle.c:62
| #1  0x00003dd2 in nx_start () at init/nx_start.c:698
| #2  0x00000190 in __start () at chip/common/lmxx_tm4c_start.c:177
| (gdb) thread 4
|   4 Thread 0x200086f0  (Name: telnetd, State: Waiting,Semaphore, Priority: 100, Stack: 2008) PC: 0xa124 in up_switch_context()
| (gdb) bt
| #0  up_switch_context (tcb=0x20001548 <g_idletcb>, rtcb=rtcb@entry=0x200086f0) at common/arm_switchcontext.c:95
| #1  0x0000453a in nxsem_wait (sem=sem@entry=0x2000916c) at semaphore/sem_wait.c:176
| #2  0x0000197e in _net_timedwait (sem=sem@entry=0x2000916c, interruptible=interruptible@entry=true, timeout=timeout@entry=4294967295) at utils/net_lock.c:101
| #3  0x0000198e in net_sem_timedwait (sem=sem@entry=0x2000916c, timeout=timeout@entry=4294967295) at utils/net_lock.c:242
| #4  0x00001996 in net_sem_wait (sem=sem@entry=0x2000916c) at utils/net_lock.c:330
| #5  0x00025f84 in psock_tcp_accept (psock=<optimized out>, addr=<optimized out>, addrlen=<optimized out>, newconn=newconn@entry=0x2000956c) at tcp/tcp_accept.c:274
| apache#6  0x00025432 in inet_accept (psock=<optimized out>, addr=<optimized out>, addrlen=<optimized out>, newsock=0x20009568, flags=0) at inet/inet_sockif.c:1443
| apache#7  0x00027a10 in psock_accept (psock=0x200044b8, addr=addr@entry=0x2000921c, addrlen=addrlen@entry=0x2000920c, newsock=newsock@entry=0x20009568, flags=flags@entry=0) at socket/accept.c:149
| apache#8  0x00027a8c in accept4 (sockfd=sockfd@entry=3, addr=addr@entry=0x2000921c, addrlen=addrlen@entry=0x2000920c, flags=flags@entry=0) at socket/accept.c:280
| apache#9  0x0002a256 in accept (sockfd=sockfd@entry=3, addr=addr@entry=0x2000921c, addrlen=addrlen@entry=0x2000920c) at net/lib_accept.c:50
| apache#10 0x0001efaa in telnetd_daemon (config=config@entry=0x20009290) at telnetd_daemon.c:200
| apache#11 0x0001e508 in telnetd_main (argc=1, argv=0x20008af8) at telnetd.c:98
| apache#12 0x00008486 in nxtask_startup (entrypt=0x1e4bd <telnetd_main>, entrypt@entry=0x1 <up_putc>, argc=1, argv=0x20008af8) at sched/task_startup.c:70
| apache#13 0x000056d2 in nxtask_start () at task/task_start.c:134
| apache#14 0x00000000 in ?? ()
| (gdb) c

Signed-off-by: chao an <[email protected]>
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@anchao @xiaoxiang781216
anchao authored and xiaoxiang781216 committed May 7, 2023
1 parent 0460165 commit af559a8
Showing 1 changed file with 37 additions and 40 deletions.
77 changes: 37 additions & 40 deletions tools/nuttx-gdbinit
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@

# NOTE: you need to use gdb configured '--with-python'
# usage: gdb -ix=./tools/nuttx-gdbinit nuttx
# new commands: info_nxthreads, nxthread pid, nxcontinue, nxthread_all_bt
# new commands: nxthread pid, nxthread_all_bt

# Do not stop with SIGUSR1 which is used for the NuttX sim SMP
handle SIGUSR1 "nostop" "pass" "noprint"
Expand Down Expand Up @@ -78,24 +78,23 @@ define _examine_target
python if (type(gdb.lookup_global_symbol("g_assignedtasks")) is gdb.Symbol) : \
gdb.execute("set $_target_has_smp = 1")

set $_target_max_tasks = g_npidhash

printf "target examined\n"
python print("_target_arch.name=" + _target_arch.name())

# NOTE: i386:x86-64 (qemu) does not work
#printf "$_target_arch : %s\n", $_target_arch

printf "$_target_has_fpu : %d\n", $_target_has_fpu
printf "$_target_has_smp : %d\n", $_target_has_smp
set $_target_examined = 1
end
end

define _running_task
if ($_target_has_smp == 0)
set $rtcb = (struct tcb_s *)g_readytorun->head
else
set $rtcb = (struct tcb_s *)g_assignedtasks[up_cpu_index()]->head
end
end

define _print_thread
set $tcb = (struct tcb_s *)$arg0
_running_task

if ($tcb == $_current_tcb)
if ($tcb == $rtcb)
printf "* "
else
printf " "
Expand Down Expand Up @@ -137,21 +136,13 @@ define _save_current_tcb
_examine_target

if ($_current_tcb == 0)
if ($_target_has_smp == 0)
set $tcb = (struct tcb_s *)g_readytorun->head
_save_tcb $tcb
else
set $cpu = up_cpu_index()
set $tcb = (struct tcb_s *)g_assignedtasks[$cpu]->head
_save_tcb $tcb
end
printf "saved current_tcb (pid=%d)\n", $tcb->pid
set $_current_tcb = $tcb
_running_task
_save_tcb $rtcb
set $_current_tcb = $rtcb
end
end

define _switch_tcb
_examine_target
_save_current_tcb

# set the current frame to the newest before switching
Expand Down Expand Up @@ -406,56 +397,62 @@ define _switch_tcb_simx86
end

define _restore_current_tcb
# TODO: SMP
set $tcb = g_readytorun->head
_switch_tcb $tcb
_examine_target
_running_task
_switch_tcb $rtcb
set $_current_tcb = 0x0
end

define nxthread
_examine_target
_save_current_tcb
set $hash = ($arg0 & ($_target_max_tasks - 1))
set $hash = ($arg0 & (g_npidhash - 1))
set $tcb = g_pidhash[$hash]
if ($tcb != 0x0)
_switch_tcb $tcb
_print_thread $tcb
if ($argc == 1)
_switch_tcb $tcb
end
if ($argc == 2)
if ($arg1 == 1)
_switch_tcb $tcb
where
_switch_tcb $tcb
where
end
end
end
_restore_current_tcb
end

define nxthread_all_bt
_save_current_tcb
set $i = 0
while ($i < $_target_max_tasks)
while ($i < g_npidhash)
# 1: backtrace
nxthread $i 1
set $i = $i + 1
end
_restore_current_tcb
end

define info_nxthreads
define info threads
_save_current_tcb
set $i = 0
while ($i < $_target_max_tasks)
while ($i < g_npidhash)
# dummy : 0 0
nxthread $i 0 0
set $i = $i + 1
end
_restore_current_tcb
end

define nxcontinue
printf "nxcontinue\n"
define c
_restore_current_tcb
continue
end

define thread
_save_current_tcb
if ($argc == 0)
_running_task
set $pid = $rtcb->pid
else
set $pid = $arg0
end

nxthread $pid
end

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