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Remove get_thread_id

Browse source 
This patch removes get_thread_id from aarch64-linux-nat.c,
arm-linux-nat.c and xtensa-linux-nat.c.

get_thread_id was added in this commit below in 2000,

  41c49b06c4
  https://sourceware.org/ml/gdb-patches/2000-04/msg00398.html

which predates the ptid_t stuff added into GDB.  Nowadays, lwpid of
inferior_ptid is only zero when the inferior is created (in
fork-child.c:fork_inferior) and its lwpid will be set after
linux_nat_wait_1 gets the first event.  After that, lwpid of
inferior_ptid is not zero for linux-nat target, then we can use
ptid_get_lwp, so this function isn't needed anymore.

Even when GDB attaches to a process, the lwp of inferior_ptid
isn't zero,  see linux-nat.c:linux_nat_attach,

  /* The ptrace base target adds the main thread with (pid,0,0)
     format.  Decorate it with lwp info.  */
  ptid = ptid_build (ptid_get_pid (inferior_ptid),
		     ptid_get_pid (inferior_ptid),
		     0);

Note that linux_nat_xfer_partial shifts lwpid to pid for inferior_ptid
temperately for calling linux_ops->to_xfer_partial, but all the
affected functions in this patch are not called in
linux_ops->to_xfer_partial.

I think we can safely remove get_thread_id for all linux native targets.

Regression tested on arm-linux and aarch64-linux.  Unable to build
native GDB and test it on xtensa-linux.

gdb:

2015-08-05  Yao Qi  <yao.qi@linaro.org>

	* aarch64-linux-nat.c (get_thread_id): Remove.
	(debug_reg_change_callback): Call ptid_get_lwp instead of
	get_thread_id.
	(fetch_gregs_from_thread): Likewise.
	(store_gregs_to_thread): Likewise.
	(fetch_fpregs_from_thread): Likewise.
	(store_fpregs_to_thread): Likewise.
	(aarch64_linux_get_debug_reg_capacity): Likewise.
	* arm-linux-nat.c (get_thread_id): Remove.
	(GET_THREAD_ID): Update macro to use ptid_get_lwp.
	* xtensa-linux-nat.c (get_thread_id): Remove.
	(GET_THREAD_ID): Update macro to use ptid_get_lwp.
	* arm-linux-nat.c (get_thread_id): Remove.
	(GET_THREAD_ID): Remove.
	(fetch_fpregs): Call ptid_get_lwp instead of GET_THREAD_ID.
	(store_fpregs, fetch_regs, store_regs): Likewise.
	(fetch_wmmx_regs, store_wmmx_regs): Likewise.
	(fetch_vfp_regs, store_vfp_regs): Likewise.
	(arm_linux_read_description): Likewise.
	(arm_linux_get_hwbp_cap): Likewise.
	* xtensa-linux-nat.c (get_thread_id): Remove.
	(GET_THREAD_ID): Remove.
	(fetch_gregs, store_gregs): Call ptid_get_lwp instead of
	GET_THREAD_ID.
This commit is contained in:
Yao Qi 2015-08-05 08:41:19 +01:00
parent ea546fbb60
commit d89fa914ad
4 changed files with 46 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
gdb/ChangeLog
View file

@ -1,3 +1,30 @@
2015-08-05 Yao Qi <yao.qi@linaro.org>
* aarch64-linux-nat.c (get_thread_id): Remove.
(debug_reg_change_callback): Call ptid_get_lwp instead of
get_thread_id.
(fetch_gregs_from_thread): Likewise.
(store_gregs_to_thread): Likewise.
(fetch_fpregs_from_thread): Likewise.
(store_fpregs_to_thread): Likewise.
(aarch64_linux_get_debug_reg_capacity): Likewise.
* arm-linux-nat.c (get_thread_id): Remove.
(GET_THREAD_ID): Update macro to use ptid_get_lwp.
* xtensa-linux-nat.c (get_thread_id): Remove.
(GET_THREAD_ID): Update macro to use ptid_get_lwp.
* arm-linux-nat.c (get_thread_id): Remove.
(GET_THREAD_ID): Remove.
(fetch_fpregs): Call ptid_get_lwp instead of GET_THREAD_ID.
(store_fpregs, fetch_regs, store_regs): Likewise.
(fetch_wmmx_regs, store_wmmx_regs): Likewise.
(fetch_vfp_regs, store_vfp_regs): Likewise.
(arm_linux_read_description): Likewise.
(arm_linux_get_hwbp_cap): Likewise.
* xtensa-linux-nat.c (get_thread_id): Remove.
(GET_THREAD_ID): Remove.
(fetch_gregs, store_gregs): Call ptid_get_lwp instead of
GET_THREAD_ID.
2015-08-04 Ciro Santilli <ciro.santilli@gmail.com> (obvious patch)
* python/py-linetable.c: Fix case of Linetable to LineTable

26
gdb/aarch64-linux-nat.c
View file

@ -48,22 +48,6 @@
#define TRAP_HWBKPT 0x0004
#endif
/* On GNU/Linux, threads are implemented as pseudo-processes, in which
case we may be tracing more than one process at a time. In that
case, inferior_ptid will contain the main process ID and the
individual thread (process) ID. get_thread_id () is used to get
the thread id if it's available, and the process id otherwise. */
static int
get_thread_id (ptid_t ptid)
{
int tid = ptid_get_lwp (ptid);
if (0 == tid)
tid = ptid_get_pid (ptid);
return tid;
}
/* Per-process data. We don't bind this to a per-inferior registry
because of targets like x86 GNU/Linux that need to keep track of
processes that aren't bound to any inferior (e.g., fork children,
@ -181,7 +165,7 @@ debug_reg_change_callback (struct lwp_info *lwp, void *ptr)
{
struct aarch64_dr_update_callback_param *param_p
= (struct aarch64_dr_update_callback_param *) ptr;
int pid = get_thread_id (lwp->ptid);
int pid = ptid_get_lwp (lwp->ptid);
int idx = param_p->idx;
int is_watchpoint = param_p->is_watchpoint;
struct arch_lwp_info *info = lwp->arch_private;
@ -266,7 +250,7 @@ fetch_gregs_from_thread (struct regcache *regcache)
and arm. */
gdb_static_assert (sizeof (regs) >= 18 * 4);
tid = get_thread_id (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
iovec.iov_base = &regs;
if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
@ -303,7 +287,7 @@ store_gregs_to_thread (const struct regcache *regcache)
/* Make sure REGS can hold all registers contents on both aarch64
and arm. */
gdb_static_assert (sizeof (regs) >= 18 * 4);
tid = get_thread_id (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
iovec.iov_base = &regs;
if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
@ -347,7 +331,7 @@ fetch_fpregs_from_thread (struct regcache *regcache)
and arm. */
gdb_static_assert (sizeof regs >= VFP_REGS_SIZE);
tid = get_thread_id (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
iovec.iov_base = &regs;
@ -394,7 +378,7 @@ store_fpregs_to_thread (const struct regcache *regcache)
/* Make sure REGS can hold all VFP registers contents on both aarch64
and arm. */
gdb_static_assert (sizeof regs >= VFP_REGS_SIZE);
tid = get_thread_id (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
iovec.iov_base = &regs;

37
gdb/arm-linux-nat.c
View file

@ -66,23 +66,6 @@
extern int arm_apcs_32;
/* On GNU/Linux, threads are implemented as pseudo-processes, in which
case we may be tracing more than one process at a time. In that
case, inferior_ptid will contain the main process ID and the
individual thread (process) ID. get_thread_id () is used to get
the thread id if it's available, and the process id otherwise. */
static int
get_thread_id (ptid_t ptid)
{
int tid = ptid_get_lwp (ptid);
if (0 == tid)
tid = ptid_get_pid (ptid);
return tid;
}
#define GET_THREAD_ID(PTID) get_thread_id (PTID)
/* Get the whole floating point state of the process and store it
into regcache. */
@ -93,7 +76,7 @@ fetch_fpregs (struct regcache *regcache)
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
/* Read the floating point state. */
if (have_ptrace_getregset == TRIBOOL_TRUE)
@ -133,7 +116,7 @@ store_fpregs (const struct regcache *regcache)
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
/* Read the floating point state. */
if (have_ptrace_getregset == TRIBOOL_TRUE)
@ -193,7 +176,7 @@ fetch_regs (struct regcache *regcache)
elf_gregset_t regs;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
if (have_ptrace_getregset == TRIBOOL_TRUE)
{
@ -223,7 +206,7 @@ store_regs (const struct regcache *regcache)
elf_gregset_t regs;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
/* Fetch the general registers. */
if (have_ptrace_getregset == TRIBOOL_TRUE)
@ -277,7 +260,7 @@ fetch_wmmx_regs (struct regcache *regcache)
int ret, regno, tid;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
if (ret < 0)
@ -306,7 +289,7 @@ store_wmmx_regs (const struct regcache *regcache)
int ret, regno, tid;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
if (ret < 0)
@ -351,7 +334,7 @@ fetch_vfp_regs (struct regcache *regcache)
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
if (have_ptrace_getregset == TRIBOOL_TRUE)
{
@ -383,7 +366,7 @@ store_vfp_regs (const struct regcache *regcache)
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
if (have_ptrace_getregset == TRIBOOL_TRUE)
{
@ -553,7 +536,7 @@ arm_linux_read_description (struct target_ops *ops)
{
elf_gregset_t gpregs;
struct iovec iov;
int tid = GET_THREAD_ID (inferior_ptid);
int tid = ptid_get_lwp (inferior_ptid);
iov.iov_base = &gpregs;
iov.iov_len = sizeof (gpregs);
@ -636,7 +619,7 @@ arm_linux_get_hwbp_cap (void)
int tid;
unsigned int val;
tid = GET_THREAD_ID (inferior_ptid);
tid = ptid_get_lwp (inferior_ptid);
if (ptrace (PTRACE_GETHBPREGS, tid, 0, &val) < 0)
available = 0;
else

18
gdb/xtensa-linux-nat.c
View file

@ -42,16 +42,6 @@
hardware-specific overlays. */
#include "xtensa-xtregs.c"
static int
get_thread_id (ptid_t ptid)
{
int tid = ptid_get_lwp (ptid);
if (0 == tid)
tid = ptid_get_pid (ptid);
return tid;
}
#define GET_THREAD_ID(PTID) get_thread_id (PTID)
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regnum)
@ -181,7 +171,7 @@ supply_fpregset (struct regcache *regcache,
static void
fetch_gregs (struct regcache *regcache, int regnum)
{
int tid = GET_THREAD_ID (inferior_ptid);
int tid = ptid_get_lwp (inferior_ptid);
const gdb_gregset_t regs;
int areg;
@ -200,7 +190,7 @@ fetch_gregs (struct regcache *regcache, int regnum)
static void
store_gregs (struct regcache *regcache, int regnum)
{
int tid = GET_THREAD_ID (inferior_ptid);
int tid = ptid_get_lwp (inferior_ptid);
gdb_gregset_t regs;
int areg;
@ -228,7 +218,7 @@ static int xtreg_high;
static void
fetch_xtregs (struct regcache *regcache, int regnum)
{
int tid = GET_THREAD_ID (inferior_ptid);
int tid = ptid_get_lwp (inferior_ptid);
const xtensa_regtable_t *ptr;
char xtregs [XTENSA_ELF_XTREG_SIZE];
@ -244,7 +234,7 @@ fetch_xtregs (struct regcache *regcache, int regnum)
static void
store_xtregs (struct regcache *regcache, int regnum)
{
int tid = GET_THREAD_ID (inferior_ptid);
int tid = ptid_get_lwp (inferior_ptid);
const xtensa_regtable_t *ptr;
char xtregs [XTENSA_ELF_XTREG_SIZE];