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* [binutils-gdb] Add support for NetBSD threads in sparc-nat.c
@ 2020-03-17 22:18 Kamil Rytarowski
0 siblings, 0 replies; only message in thread
From: Kamil Rytarowski @ 2020-03-17 22:18 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2108a63a5a736c2329a2a92ca58e0b9993dc5d42
commit 2108a63a5a736c2329a2a92ca58e0b9993dc5d42
Author: Kamil Rytarowski <n54@gmx.com>
Date: Sat Mar 14 17:41:11 2020 +0100
Add support for NetBSD threads in sparc-nat.c
NetBSD ptrace(2) accepts thread id (LWP) as the 4th argument for threads.
Define gdb_ptrace() a wrapper function for ptrace(2) that properly passes
the pid,lwp pair on NetBSD and the result of get_ptrace_pid() for others.
gdb/ChangeLog:
* sparc-nat.c (gdb_ptrace): New.
* sparc-nat.c (sparc_fetch_inferior_registers)
(sparc_store_inferior_registers) Remove obsolete comment.
* sparc-nat.c (sparc_fetch_inferior_registers)
(sparc_store_inferior_registers) Switch from pid_t to ptid_t.
* sparc-nat.c (sparc_fetch_inferior_registers)
(sparc_store_inferior_registers) Use gdb_ptrace.
Diff:
---
gdb/ChangeLog | 10 ++++++++++
gdb/sparc-nat.c | 50 ++++++++++++++++++++++----------------------------
2 files changed, 32 insertions(+), 28 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e418e43740d..abf3346edb3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,13 @@
+2020-03-17 Kamil Rytarowski <n54@gmx.com>
+
+ * sparc-nat.c (gdb_ptrace): New.
+ * sparc-nat.c (sparc_fetch_inferior_registers)
+ (sparc_store_inferior_registers) Remove obsolete comment.
+ * sparc-nat.c (sparc_fetch_inferior_registers)
+ (sparc_store_inferior_registers) Switch from pid_t to ptid_t.
+ * sparc-nat.c (sparc_fetch_inferior_registers)
+ (sparc_store_inferior_registers) Use gdb_ptrace.
+
2020-03-17 Kamil Rytarowski <n54@gmx.com>
* sh-nbsd-nat.c (fetch_registers): New variable lwp and pass
diff --git a/gdb/sparc-nat.c b/gdb/sparc-nat.c
index dff0f521565..fadcfd34474 100644
--- a/gdb/sparc-nat.c
+++ b/gdb/sparc-nat.c
@@ -78,6 +78,19 @@ typedef struct fp_status fpregset_t;
#define PTRACE_SETFPREGS PT_SETFPREGS
#endif
+static int
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
+{
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
+
/* Register set description. */
const struct sparc_gregmap *sparc_gregmap;
const struct sparc_fpregmap *sparc_fpregmap;
@@ -137,22 +150,7 @@ void
sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
- pid_t pid;
-
- /* NOTE: cagney/2002-12-03: This code assumes that the currently
- selected light weight processes' registers can be written
- directly into the selected thread's register cache. This works
- fine when given an 1:1 LWP:thread model (such as found on
- GNU/Linux) but will, likely, have problems when used on an N:1
- (userland threads) or N:M (userland multiple LWP) model. In the
- case of the latter two, the LWP's registers do not necessarily
- belong to the selected thread (the LWP could be in the middle of
- executing the thread switch code).
-
- These functions should instead be parameterized with an explicit
- object (struct regcache, struct thread_info?) into which the LWPs
- registers can be written. */
- pid = get_ptrace_pid (regcache->ptid ());
+ ptid_t ptid = regcache->ptid ();
if (regnum == SPARC_G0_REGNUM)
{
@@ -166,7 +164,7 @@ sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
gregset_t regs;
- if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't get registers"));
sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s);
@@ -178,7 +176,7 @@ sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
fpregset_t fpregs;
- if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1)
perror_with_name (_("Couldn't get floating point status"));
sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs);
@@ -189,22 +187,18 @@ void
sparc_store_inferior_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
- pid_t pid;
-
- /* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
- about threaded assumptions. */
- pid = get_ptrace_pid (regcache->ptid ());
+ ptid_t ptid = regcache->ptid ();
if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
{
gregset_t regs;
- if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't get registers"));
sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s);
- if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ if (gdb_ptrace (PTRACE_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't write registers"));
/* Deal with the stack regs. */
@@ -225,7 +219,7 @@ sparc_store_inferior_registers (struct regcache *regcache, int regnum)
{
fpregset_t fpregs, saved_fpregs;
- if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1)
perror_with_name (_("Couldn't get floating-point registers"));
memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
@@ -237,8 +231,8 @@ sparc_store_inferior_registers (struct regcache *regcache, int regnum)
to write the registers if nothing changed. */
if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
{
- if (ptrace (PTRACE_SETFPREGS, pid,
- (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ if (gdb_ptrace (PTRACE_SETFPREGS, ptid,
+ (PTRACE_TYPE_ARG3) &fpregs) == -1)
perror_with_name (_("Couldn't write floating-point registers"));
}
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