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add linux_infcall_mmap

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This implements the new gdbarch "infcall_mmap" method for Linux.

gdb/ChangeLog
2014-12-12  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* linux-tdep.c: Include objfiles.h and infcall.h.
	(GDB_MMAP_MAP_PRIVATE, GDB_MMAP_MAP_ANONYMOUS, linux_infcall_mmap): New
	function.
	(linux_init_abi): Add linux_infcall_mmap to gdbarch.
This commit is contained in:
Jan Kratochvil 2014-05-14 14:32:09 -06:00
parent d064d1bef5
commit 3bc3cebe8a
2 changed files with 56 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2014-12-12 Jan Kratochvil <jan.kratochvil@redhat.com>
* linux-tdep.c: Include objfiles.h and infcall.h.
(GDB_MMAP_MAP_PRIVATE, GDB_MMAP_MAP_ANONYMOUS, linux_infcall_mmap): New
function.
(linux_init_abi): Add linux_infcall_mmap to gdbarch.
2014-12-12 Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf2loc.h (dwarf2_reg_to_regnum_or_error): Declare.

49
gdb/linux-tdep.c
View File

@ -33,6 +33,8 @@
#include "arch-utils.h"
#include "gdb_obstack.h"
#include "observer.h"
#include "objfiles.h"
#include "infcall.h"
#include <ctype.h>
@ -1921,6 +1923,52 @@ linux_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range)
return 1;
}
/* Symbols for linux_infcall_mmap's ARG_FLAGS; their Linux MAP_* system
definitions would be dependent on compilation host. */
#define GDB_MMAP_MAP_PRIVATE 0x02 /* Changes are private. */
#define GDB_MMAP_MAP_ANONYMOUS 0x20 /* Don't use a file. */
/* See gdbarch.sh 'infcall_mmap'. */
static CORE_ADDR
linux_infcall_mmap (CORE_ADDR size, unsigned prot)
{
struct objfile *objf;
/* Do there still exist any Linux systems without "mmap64"?
"mmap" uses 64-bit off_t on x86_64 and 32-bit off_t on i386 and x32. */
struct value *mmap_val = find_function_in_inferior ("mmap64", &objf);
struct value *addr_val;
struct gdbarch *gdbarch = get_objfile_arch (objf);
CORE_ADDR retval;
enum
{
ARG_ADDR, ARG_LENGTH, ARG_PROT, ARG_FLAGS, ARG_FD, ARG_OFFSET, ARG_MAX
};
struct value *arg[ARG_MAX];
arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr,
0);
/* Assuming sizeof (unsigned long) == sizeof (size_t). */
arg[ARG_LENGTH] = value_from_ulongest
(builtin_type (gdbarch)->builtin_unsigned_long, size);
gdb_assert ((prot & ~(GDB_MMAP_PROT_READ | GDB_MMAP_PROT_WRITE
| GDB_MMAP_PROT_EXEC))
== 0);
arg[ARG_PROT] = value_from_longest (builtin_type (gdbarch)->builtin_int, prot);
arg[ARG_FLAGS] = value_from_longest (builtin_type (gdbarch)->builtin_int,
GDB_MMAP_MAP_PRIVATE
| GDB_MMAP_MAP_ANONYMOUS);
arg[ARG_FD] = value_from_longest (builtin_type (gdbarch)->builtin_int, -1);
arg[ARG_OFFSET] = value_from_longest (builtin_type (gdbarch)->builtin_int64,
0);
addr_val = call_function_by_hand (mmap_val, ARG_MAX, arg);
retval = value_as_address (addr_val);
if (retval == (CORE_ADDR) -1)
error (_("Failed inferior mmap call for %s bytes, errno is changed."),
pulongest (size));
return retval;
}
/* To be called from the various GDB_OSABI_LINUX handlers for the
various GNU/Linux architectures and machine types. */
@ -1939,6 +1987,7 @@ linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_gdb_signal_to_target (gdbarch,
linux_gdb_signal_to_target);
set_gdbarch_vsyscall_range (gdbarch, linux_vsyscall_range);
set_gdbarch_infcall_mmap (gdbarch, linux_infcall_mmap);
}
/* Provide a prototype to silence -Wmissing-prototypes. */