Re: [PATCH] Remove MAX_REGISTER_SIZE from remote-sim.c

Alan Hayward
2017-06-26T12:41:27Z

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> On 24 Mar 2017, at 11:59, Yao Qi <qiyaoltc@gmail.com> wrote:
>
> On Fri, Mar 24, 2017 at 11:39 AM, Alan Hayward <Alan.Hayward@arm.com> wrote:
>>>
>>> What is your target triplet? Do you see remote-sim.o in your build
>>> directory? remote-sim.c may not be built at all.
>>
>> You’re correct - I’m not building remote-sim at all!
>> Forcing SIM_OBS in Makefile.in gives me a compile error (just need to
>> cast result of value_contents_all to remove the const).
>>
>> Is there an easy way to build and test remote-sim ?
>>
>
> remote-sim.c is built if I configure gdb --target=arm-none-eabi.
> I don't know how to test either, running sim test cases, Mike?
>
> --
> Yao (é½å°§)

Reworked this patch based on changes I’ve mode to similar patches.

Built using --target=arm-none-eabi then tested using
--target_board=arm-sim

Ok to commit?

2017-06-26 Alan Hayward <alan.hayward@arm.com>

* remote-sim.c (gdbsim_fetch_register): Use byte_vector.
(gdbsim_store_register): Likewise.

diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index fd1bc66642389a4879171af8eeee30a5df7cbaec..8ff0bc937e5f2ec61d965788166b2bb12fdf7045 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -40,6 +40,7 @@
#include "arch-utils.h"
#include "readline/readline.h"
#include "gdbthread.h"
+#include "common/byte-vector.h"

/* Prototypes */

@@ -448,38 +449,32 @@ gdbsim_fetch_register (struct target_ops *ops,
{
/* For moment treat a `does not exist' register the same way
as an ``unavailable'' register. */
- gdb_byte buf[MAX_REGISTER_SIZE];
- int nr_bytes;
-
- memset (buf, 0, MAX_REGISTER_SIZE);
- regcache_raw_supply (regcache, regno, buf);
+ regcache->raw_supply_zeroed (regno);
break;
}

default:
{
static int warn_user = 1;
- gdb_byte buf[MAX_REGISTER_SIZE];
+ int regsize = register_size (gdbarch, regno);
+ gdb::byte_vector buf (regsize, 0);
int nr_bytes;

gdb_assert (regno >= 0 && regno < gdbarch_num_regs (gdbarch));
- memset (buf, 0, MAX_REGISTER_SIZE);
nr_bytes = sim_fetch_register (sim_data->gdbsim_desc,
gdbarch_register_sim_regno
(gdbarch, regno),
- buf,
- register_size (gdbarch, regno));
+ buf.data (), regsize);
if (nr_bytes > 0
- && nr_bytes != register_size (gdbarch, regno) && warn_user)
+ && nr_bytes != regsize && warn_user)
{
fprintf_unfiltered (gdb_stderr,
"Size of register %s (%d/%d) "
"incorrect (%d instead of %d))",
gdbarch_register_name (gdbarch, regno),
regno,
- gdbarch_register_sim_regno
- (gdbarch, regno),
- nr_bytes, register_size (gdbarch, regno));
+ gdbarch_register_sim_regno (gdbarch, regno),
+ nr_bytes, regsize);
warn_user = 0;
}
/* FIXME: cagney/2002-05-27: Should check `nr_bytes == 0'
@@ -487,13 +482,13 @@ gdbsim_fetch_register (struct target_ops *ops,
which registers are fetchable. */
/* Else if (nr_bytes < 0): an old simulator, that doesn't
think to return the register size. Just assume all is ok. */
- regcache_raw_supply (regcache, regno, buf);
+ regcache->raw_supply (regno, buf.data ());
if (remote_debug)
{
fprintf_unfiltered (gdb_stdlog,
"gdbsim_fetch_register: %d", regno);
/* FIXME: We could print something more intelligible. */
- dump_mem (buf, register_size (gdbarch, regno));
+ dump_mem (buf.data (), regsize);
}
break;
}
@@ -518,15 +513,17 @@ gdbsim_store_register (struct target_ops *ops,
}
else if (gdbarch_register_sim_regno (gdbarch, regno) >= 0)
{
- gdb_byte tmp[MAX_REGISTER_SIZE];
+ int regsize = register_size (gdbarch, regno);
+ gdb::byte_vector tmp (regsize);
int nr_bytes;

- regcache_cooked_read (regcache, regno, tmp);
+ regcache->cooked_read (regno, tmp.data ());
nr_bytes = sim_store_register (sim_data->gdbsim_desc,
gdbarch_register_sim_regno
(gdbarch, regno),
- tmp, register_size (gdbarch, regno));
- if (nr_bytes > 0 && nr_bytes != register_size (gdbarch, regno))
+ tmp.data (), regsize);
+
+ if (nr_bytes > 0 && nr_bytes != regsize)
internal_error (__FILE__, __LINE__,
_("Register size different to expected"));
if (nr_bytes < 0)
@@ -540,7 +537,7 @@ gdbsim_store_register (struct target_ops *ops,
{
fprintf_unfiltered (gdb_stdlog, "gdbsim_store_register: %d", regno);
/* FIXME: We could print something more intelligible. */
- dump_mem (tmp, register_size (gdbarch, regno));
+ dump_mem (tmp.data (), regsize);
}
}
}

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