LowLevel/Luma3DS-3GX
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gdb: avoid race conditions

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This commit is contained in:
TuxSH 2019-03-31 01:12:22 +01:00
parent cd18b85632
commit ea14d8a186
3 changed files with 42 additions and 12 deletions
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4
sysmodules/rosalina/include/gdb/server.h
View File

@ -47,6 +47,10 @@ void GDB_IncrementServerReferenceCount(GDBServer *server);
void GDB_DecrementServerReferenceCount(GDBServer *server);
void GDB_RunServer(GDBServer *server);
void GDB_LockAllContexts(GDBServer *server);
void GDB_UnlockAllContexts(GDBServer *server);
GDBContext *GDB_SelectAvailableContext(GDBServer *server, u16 minPort, u16 maxPort);
int GDB_AcceptClient(GDBContext *ctx);

32
sysmodules/rosalina/source/gdb/server.c
View File

@ -90,18 +90,35 @@ void GDB_RunServer(GDBServer *server)
server_run(&server->super);
}
void GDB_LockAllContexts(GDBServer *server)
{
for (u32 i = 0; i < MAX_DEBUG; i++)
RecursiveLock_Lock(&server->ctxs[i].lock);
}
void GDB_UnlockAllContexts(GDBServer *server)
{
for (u32 i = MAX_DEBUG; i > 0; i--)
RecursiveLock_Unlock(&server->ctxs[i - 1].lock);
}
GDBContext *GDB_SelectAvailableContext(GDBServer *server, u16 minPort, u16 maxPort)
{
GDBContext *ctx;
u16 port;
GDB_LockAllContexts(server);
// Get a context
u32 id;
for(id = 0; id < MAX_DEBUG && (server->ctxs[id].flags & GDB_FLAG_SELECTED); id++);
if(id < MAX_DEBUG)
ctx = &server->ctxs[id];
else
{
GDB_UnlockAllContexts(server);
return NULL;
}
// Get a port
for (port = minPort; port < maxPort; port++)
@ -119,20 +136,17 @@ GDBContext *GDB_SelectAvailableContext(GDBServer *server, u16 minPort, u16 maxPo
if (port >= maxPort)
{
RecursiveLock_Lock(&ctx->lock);
ctx->flags = ~GDB_FLAG_SELECTED;
RecursiveLock_Unlock(&ctx->lock);
return NULL;
ctx = NULL;
}
else
{
RecursiveLock_Lock(&ctx->lock);
ctx->flags |= GDB_FLAG_SELECTED;
ctx->localPort = port;
RecursiveLock_Unlock(&ctx->lock);
return ctx;
}
GDB_UnlockAllContexts(server);
return ctx;
}
int GDB_AcceptClient(GDBContext *ctx)
@ -201,6 +215,7 @@ int GDB_CloseClient(GDBContext *ctx)
GDBContext *GDB_GetClient(GDBServer *server, u16 port)
{
GDB_LockAllContexts(server);
GDBContext *ctx = NULL;
if (port >= GDB_PORT_BASE && port < GDB_PORT_BASE + MAX_DEBUG)
{
@ -216,12 +231,11 @@ GDBContext *GDB_GetClient(GDBServer *server, u16 port)
if (ctx != NULL)
{
RecursiveLock_Lock(&ctx->lock);
ctx->flags |= GDB_FLAG_USED;
ctx->state = GDB_STATE_CONNECTED;
RecursiveLock_Unlock(&ctx->lock);
}
GDB_UnlockAllContexts(server);
return ctx;
}

18
sysmodules/rosalina/source/menus/process_list.c
View File

@ -52,9 +52,16 @@ extern GDBServer gdbServer;
static inline int ProcessListMenu_FormatInfoLine(char *out, const ProcessInfo *info)
{
const char *checkbox;
u32 id;
for(id = 0; id < MAX_DEBUG && (!(gdbServer.ctxs[id].flags & GDB_FLAG_SELECTED) || gdbServer.ctxs[id].pid != info->pid); id++);
checkbox = !gdbServer.super.running ? "" : (id < MAX_DEBUG ? "(x) " : "( ) ");
u32 id = 0;
if(gdbServer.super.running)
{
GDB_LockAllContexts(&gdbServer);
for(id = 0; id < MAX_DEBUG && (!(gdbServer.ctxs[id].flags & GDB_FLAG_SELECTED) || gdbServer.ctxs[id].pid != info->pid); id++);
checkbox = id < MAX_DEBUG ? "(x) " : "( ) ";
}
else
checkbox = "";
char commentBuf[23 + 1] = { 0 }; // exactly the size of "Remote: 255.255.255.255"
memset(commentBuf, ' ', 23);
@ -77,6 +84,8 @@ static inline int ProcessListMenu_FormatInfoLine(char *out, const ProcessInfo *i
}
}
if (gdbServer.super.running)
GDB_UnlockAllContexts(&gdbServer);
return sprintf(out, "%s%-4lu %-8.8s %s", checkbox, info->pid, info->name, commentBuf); // Theoritically PIDs are 32-bit ints, but we'll only justify 4 digits
}
@ -581,6 +590,7 @@ static inline void ProcessListMenu_HandleSelected(const ProcessInfo *info)
return;
}
GDB_LockAllContexts(&gdbServer);
u32 id;
for(id = 0; id < MAX_DEBUG && (!(gdbServer.ctxs[id].flags & GDB_FLAG_SELECTED) || gdbServer.ctxs[id].pid != info->pid); id++);
@ -610,6 +620,8 @@ static inline void ProcessListMenu_HandleSelected(const ProcessInfo *info)
if (ctx != NULL)
ctx->pid = info->pid;
}
GDB_UnlockAllContexts(&gdbServer);
}
s32 ProcessListMenu_FetchInfo(void)