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[ia64-hpux] unwinding bsp value from system call

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This fixes unwinding from a thread that is stopped inside a system call.
This can be seen when switching to a thread that is stopped doing a
pthread_cond_wait, for instance...

The comments inside the code should explain what is happening in our
case (the HP-UX exception in the case of system calls): Under certain
circumstances (program stopped inside syscall), the offset to apply to
the current BSP in order to compute the previous BSP is not the usual
CFM & 0x7f.

We parts in this patch:

  1. Figuring out that we are stopped inside a syscal: This requires
     a TT_LWP_RUREGS ttrace call, which is not directly possible from
     ia64-tdep.c.  So use defined a new TARGET_OBJECT_HPUX_UREGS object
     to request it from the -nat side.

  2. Add a gdbarch_tdep method that allows us to change the default
     behavior on ia64-hpux, permitting us to have a different "size of
     register frame" in that one particular case.

gdb/ChangeLog:

        * target.h (enum target_object): Add TARGET_OBJECT_HPUX_UREGS.
        * ia64-tdep.h (struct frame_info): forward declaration.
        (struct gdbarch_tdep): Add field size_of_register_frame.
        * ia64-tdep.c (ia64_access_reg): Use tdep->size_of_register_frame
        to determine the size of the register frame.
        (ia64_size_of_register_frame): New function.
        (ia64_gdbarch_init): Set tdep->size_of_register_frame.
        * ia64-hpux-tdep.c: Include "target.h" and "frame.h".
        (IA64_HPUX_UREG_REASON): New macro.
        (ia64_hpux_stopped_in_syscall, ia64_hpux_size_of_register_frame):
        New functions.
        (ia64_hpux_init_abi): Set tdep->size_of_register_frame.
        * ia64-hpux-nat.c (ia64_hpux_xfer_uregs): New function.
        (ia64_hpux_xfer_partial): Add handling of TARGET_OBJECT_HPUX_UREGS
        objects.
This commit is contained in:
Joel Brobecker
2011-01-13 16:24:27 +00:00
parent 92c9a4639b
commit 77ca787b12
6 changed files with 122 additions and 2 deletions
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9
gdb/ia64-tdep.h
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@@ -195,11 +195,20 @@
#define IA64_NAT32_REGNUM (IA64_NAT0_REGNUM + 32)
#define IA64_NAT127_REGNUM (IA64_NAT0_REGNUM + 127)
struct frame_info;
struct gdbarch_tdep
{
CORE_ADDR (*sigcontext_register_address) (struct gdbarch *, CORE_ADDR, int);
int (*pc_in_sigtramp) (CORE_ADDR);
/* Return the total size of THIS_FRAME's register frame.
CFM is THIS_FRAME's cfm register value.
Normally, the size of the register frame is always obtained by
extracting the lowest 7 bits ("cfm & 0x7f"). */
int (*size_of_register_frame) (struct frame_info *this_frame, ULONGEST cfm);
/* ISA-specific data types. */
struct type *ia64_ext_type;
};