[01/31] gdbserver: make linux target op 'cannot_store_register' a predicate function
Commit Message
The comment for the linux target op 'cannot_store_register' states the
following:
/* Returns 0 if we can store the register, 1 if we can not
store the register, and 2 if failure to store the register
is acceptable. */
There is only one low target, linux-ppc-low, that potentially returns
2. There are two places that call the 'cannot_store_register' target
op in linux-low.cc. None of these locations distinguish a '2' from a
'1'. Hence, to simplify the definition, make the function a predicate
that returns either 0 or 1. This is also consistent with the
companion function, 'cannot_fetch_register'.
gdbserver/ChangeLog:
2020-03-06 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* linux-low.h (struct linux_target_ops): Update the comment for
'cannot_store_register' to return 0 or 1.
* linux-ppc-low.cc (ppc_cannot_store_register): Return 1 instead
of 2.
---
gdbserver/linux-low.h | 7 +++----
gdbserver/linux-ppc-low.cc | 4 ++--
2 files changed, 5 insertions(+), 6 deletions(-)
@@ -135,11 +135,10 @@ struct linux_target_ops
void (*arch_setup) (void);
const struct regs_info *(*regs_info) (void);
- int (*cannot_fetch_register) (int);
- /* Returns 0 if we can store the register, 1 if we can not
- store the register, and 2 if failure to store the register
- is acceptable. */
+ /* Return 0 if we can fetch/store the register, 1 if we cannot
+ fetch/store the register. */
+ int (*cannot_fetch_register) (int);
int (*cannot_store_register) (int);
/* Hook to fetch a register in some non-standard way. Used for
@@ -152,13 +152,13 @@ ppc_cannot_store_register (int regno)
/* Some kernels do not allow us to store fpscr. */
if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE)
&& regno == find_regno (tdesc, "fpscr"))
- return 2;
+ return 1;
#endif
/* Some kernels do not allow us to store orig_r3 or trap. */
if (regno == find_regno (tdesc, "orig_r3")
|| regno == find_regno (tdesc, "trap"))
- return 2;
+ return 1;
return 0;
}