gdb: Update to version 7.12

[people/pmueller/ipfire-3.x.git] / gdb / patches / gdb-x86_64-i386-syscall-restart.patch

diff --git a/gdb/patches/gdb-x86_64-i386-syscall-restart.patch b/gdb/patches/gdb-x86_64-i386-syscall-restart.patch
deleted file mode 100644 (file)
index d5d6b10..0000000
--- a/gdb/patches/gdb-x86_64-i386-syscall-restart.patch
+++ /dev/null
@@ -1,121 +0,0 @@
-http://sourceware.org/ml/gdb-patches/2009-11/msg00592.html
-Subject: [patch] Fix syscall restarts for amd64->i386 biarch
-
-Hi,
-
-tested only on recent Linux kernels, it should apply also on vanilla ones.
-There were various changes of the kernels behavior in the past.
-
-FSF GDB HEAD state:
-kernel debugger inferior state
-x86_64 x86_64   x86_64   PASS
-x86_64 x86_64   i386     FAIL without this patch, PASS with this patch
-x86_64 i386     i386     PASS on recent kernels
-                         (FAIL: kernel-2.6.31.5-127.fc12.x86_64 - Fedora 12)
-                         (PASS: kernel-2.6.32-0.55.rc8.git1.fc13.x86_64)
-i386   i386     i386     PASS
-
-
-Currently gdb.base/interrupt.exp fails on amd64 host running under
---target_board unix/-m32 with:
-       continue
-       Continuing.
-       Unknown error 512
-
-<linux/errno.h>:
-/*
- * These should never be seen by user programs.  To return one of ERESTART*
- * codes, signal_pending() MUST be set.  Note that ptrace can observe these
- * at syscall exit tracing, but they will never be left for the debugged user
- * process to see.
- */
-#define ERESTARTSYS     512
-
-"Unknown error 512" printed above is printed by the inferior itself, not by GDB.
-
-It is because GDB reads it as 0xfffffffffffffe00 but writes it back as
-0xfffffe00.
-+      /* Sign-extend %eax as during return from a syscall it is being checked
-+       for -ERESTART* values -512 being above 0xfffffffffffffe00; tested by
-+       interrupt.exp.  */
-
-
-Quote of Roland McGrath from IRC:
-
-roland: in the user_regset model, there are 64-bit user_regset flavors and
-32-bit user_regset flavors, so at the kabi level the (kernel) caller can say
-what it means: calls on the 32-bit user_regset flavor will behave as if on
-a 32-bit kernel/userland.  in ptrace, there is no way for x86_64 ptrace calls
-to say "i think of the inferior as being 32 bits, so act accordingly" (tho ppc
-and/or sparc have ptr
-roland: ace requests that do that iirc)
-roland: ergo 64-bit ptrace callers must either save/restore full 64-bits so
-the kernel's sign-extension choices are preserved, or else grok magic ways to
-expand stored 32-bit register contents to 64-bit values to stuff via 64-bit
-ptrace
-[...]
-roland: there is a "32-bit-flavored task", but it's not really true that it
-has 32-bit registers.  there is no 32-bit-only userland condition.  any task
-can always ljmp to the 64-bit code segment and run 64-bit insns including
-a 64-bit syscall
-roland: so a 64-bit debugger should see and be able to fiddle the full
-registers.  it can even change cs via ptrace to force the inferior into
-running 32 or 64 bit code.
-
-
-Saving whole 64bits for i386 targets on x86_64 hosts does not much match the
-GDB architecture as `struct type' for these registers still should be 32bit
-etc.   Therefore provided just this exception.
-
-The problem is reproducible only if one does an inferior call during the
-interruption to do full inferior save/restore from GDB regcache.
-
-Regression tested on {x86_64,x86_64-m32,i686}-fedora12-linux-gnu.
-
-
-Thanks,
-Jan
-
-
-gdb/
-2009-11-29  Jan Kratochvil  <jan.kratochvil@redhat.com>
-
-       * amd64-nat.c (amd64_collect_native_gregset): Do not pre-clear %eax.
-       Sign extend it afterwards.
-
---- a/gdb/amd64-nat.c
-+++ b/gdb/amd64-nat.c
-@@ -131,9 +131,9 @@ amd64_collect_native_gregset (const struct regcache *regcache,
-     {
-       num_regs = amd64_native_gregset32_num_regs;
- 
--      /* Make sure %eax, %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and
-+      /* Make sure %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and
-          %eip get zero-extended to 64 bits.  */
--      for (i = 0; i <= I386_EIP_REGNUM; i++)
-+      for (i = I386_ECX_REGNUM; i <= I386_EIP_REGNUM; i++)
-       {
-         if (regnum == -1 || regnum == i)
-           memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8);
-@@ -159,4 +159,20 @@ amd64_collect_native_gregset (const struct regcache *regcache,
-           regcache_raw_collect (regcache, i, regs + offset);
-       }
-     }
-+
-+  if (gdbarch_ptr_bit (gdbarch) == 32)
-+    {
-+      /* Sign-extend %eax as during return from a syscall it is being checked
-+       for -ERESTART* values -512 being above 0xfffffffffffffe00; tested by
-+       interrupt.exp.  */
-+
-+      int i = I386_EAX_REGNUM;
-+
-+      if (regnum == -1 || regnum == i)
-+      {
-+        void *ptr = regs + amd64_native_gregset_reg_offset (gdbarch, i);
-+
-+        *(int64_t *) ptr = *(int32_t *) ptr;
-+      }
-+    }
- }
-