[PATCH 07/14] add infcall_mmap and gcc_target_options gdbarch methods

[Tom Tromey <tromey@redhat.com>]

From: Jan Kratochvil <jan.kratochvil@redhat.com>

The compiler needed two new gdbarch methods.

The infcall_mmap method allocates memory in the inferior.
This is used when inserting the object code.

The gcc_target_options method computes some arch-specific gcc options
to pass to the compiler.  This is used to ensure that gcc generates
object code for the correct architecture.

2014-05-16  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* arch-utils.c (default_infcall_mmap)
	(default_gcc_target_options): New functions.
	* arch-utils.h (default_infcall_mmap, default_gcc_target_options):
	Declare.
	* gdbarch.h: Rebuild.
	* gdbarch.c: Rebuild.
	* gdbarch.sh (infcall_mmap, gcc_target_options): New methods.
---
 gdb/ChangeLog    | 10 ++++++++++
 gdb/arch-utils.c | 13 +++++++++++++
 gdb/arch-utils.h |  4 ++++
 gdb/gdbarch.c    | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 gdb/gdbarch.h    | 18 ++++++++++++++++++
 gdb/gdbarch.sh   | 12 ++++++++++++
 6 files changed, 103 insertions(+)

diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c
index bff1a10..e2aea7a 100644
--- a/gdb/arch-utils.c
+++ b/gdb/arch-utils.c
@@ -819,6 +819,19 @@ int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
   return 0;
 }
 
+CORE_ADDR
+default_infcall_mmap (CORE_ADDR size, unsigned prot)
+{
+  error (_("This target does not support inferior memory allocation by mmap."));
+}
+
+char *
+default_gcc_target_options (struct gdbarch *gdbarch)
+{
+  return xstrprintf ("-m%d%s", gdbarch_ptr_bit (gdbarch),
+		     gdbarch_ptr_bit (gdbarch) == 64 ? " -mcmodel=large" : "");
+}
+
 /* */
 
 /* -Wmissing-prototypes */
diff --git a/gdb/arch-utils.h b/gdb/arch-utils.h
index 46d1573..d4bf353 100644
--- a/gdb/arch-utils.h
+++ b/gdb/arch-utils.h
@@ -174,4 +174,8 @@ extern int default_return_in_first_hidden_param_p (struct gdbarch *,
 extern int default_insn_is_call (struct gdbarch *, CORE_ADDR);
 extern int default_insn_is_ret (struct gdbarch *, CORE_ADDR);
 extern int default_insn_is_jump (struct gdbarch *, CORE_ADDR);
+
+extern CORE_ADDR default_infcall_mmap (CORE_ADDR size, unsigned prot);
+extern char *default_gcc_target_options (struct gdbarch *gdbarch);
+
 #endif
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index 4f82095..b931690 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -319,6 +319,8 @@ struct gdbarch
   gdbarch_insn_is_ret_ftype *insn_is_ret;
   gdbarch_insn_is_jump_ftype *insn_is_jump;
   gdbarch_auxv_parse_ftype *auxv_parse;
+  gdbarch_infcall_mmap_ftype *infcall_mmap;
+  gdbarch_gcc_target_options_ftype *gcc_target_options;
 };
 
 /* Create a new ``struct gdbarch'' based on information provided by
@@ -411,6 +413,8 @@ gdbarch_alloc (const struct gdbarch_info *info,
   gdbarch->insn_is_call = default_insn_is_call;
   gdbarch->insn_is_ret = default_insn_is_ret;
   gdbarch->insn_is_jump = default_insn_is_jump;
+  gdbarch->infcall_mmap = default_infcall_mmap;
+  gdbarch->gcc_target_options = default_gcc_target_options;
   /* gdbarch_alloc() */
 
   return gdbarch;
@@ -630,6 +634,8 @@ verify_gdbarch (struct gdbarch *gdbarch)
   /* Skip verify of insn_is_ret, invalid_p == 0 */
   /* Skip verify of insn_is_jump, invalid_p == 0 */
   /* Skip verify of auxv_parse, has predicate.  */
+  /* Skip verify of infcall_mmap, invalid_p == 0 */
+  /* Skip verify of gcc_target_options, invalid_p == 0 */
   buf = ui_file_xstrdup (log, &length);
   make_cleanup (xfree, buf);
   if (length > 0)
@@ -894,6 +900,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
                       "gdbarch_dump: frame_red_zone_size = %s\n",
                       plongest (gdbarch->frame_red_zone_size));
   fprintf_unfiltered (file,
+                      "gdbarch_dump: gcc_target_options = <%s>\n",
+                      host_address_to_string (gdbarch->gcc_target_options));
+  fprintf_unfiltered (file,
                       "gdbarch_dump: gdbarch_gcore_bfd_target_p() = %d\n",
                       gdbarch_gcore_bfd_target_p (gdbarch));
   fprintf_unfiltered (file,
@@ -960,6 +969,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
                       "gdbarch_dump: in_solib_return_trampoline = <%s>\n",
                       host_address_to_string (gdbarch->in_solib_return_trampoline));
   fprintf_unfiltered (file,
+                      "gdbarch_dump: infcall_mmap = <%s>\n",
+                      host_address_to_string (gdbarch->infcall_mmap));
+  fprintf_unfiltered (file,
                       "gdbarch_dump: gdbarch_info_proc_p() = %d\n",
                       gdbarch_info_proc_p (gdbarch));
   fprintf_unfiltered (file,
@@ -4406,6 +4418,40 @@ set_gdbarch_auxv_parse (struct gdbarch *gdbarch,
   gdbarch->auxv_parse = auxv_parse;
 }
 
+CORE_ADDR
+gdbarch_infcall_mmap (struct gdbarch *gdbarch, CORE_ADDR size, unsigned prot)
+{
+  gdb_assert (gdbarch != NULL);
+  gdb_assert (gdbarch->infcall_mmap != NULL);
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, "gdbarch_infcall_mmap called\n");
+  return gdbarch->infcall_mmap (size, prot);
+}
+
+void
+set_gdbarch_infcall_mmap (struct gdbarch *gdbarch,
+                          gdbarch_infcall_mmap_ftype infcall_mmap)
+{
+  gdbarch->infcall_mmap = infcall_mmap;
+}
+
+char *
+gdbarch_gcc_target_options (struct gdbarch *gdbarch)
+{
+  gdb_assert (gdbarch != NULL);
+  gdb_assert (gdbarch->gcc_target_options != NULL);
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, "gdbarch_gcc_target_options called\n");
+  return gdbarch->gcc_target_options (gdbarch);
+}
+
+void
+set_gdbarch_gcc_target_options (struct gdbarch *gdbarch,
+                                gdbarch_gcc_target_options_ftype gcc_target_options)
+{
+  gdbarch->gcc_target_options = gcc_target_options;
+}
+
 
 /* Keep a registry of per-architecture data-pointers required by GDB
    modules.  */
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index c621091..00fc1ac 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -1316,6 +1316,24 @@ typedef int (gdbarch_auxv_parse_ftype) (struct gdbarch *gdbarch, gdb_byte **read
 extern int gdbarch_auxv_parse (struct gdbarch *gdbarch, gdb_byte **readptr, gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 extern void set_gdbarch_auxv_parse (struct gdbarch *gdbarch, gdbarch_auxv_parse_ftype *auxv_parse);
 
+/* Allocate SIZE bytes of PROT protected page aligned memory in inferior.
+   PROT has rwx bitmask format - bit 2 (value 4) is for readable memory, bit 1
+   (value 2) is for writable memory and bit 0 (value 1) is for executable memory.
+   Throw an error if it is not possible.  Returned address is always valid. */
+
+typedef CORE_ADDR (gdbarch_infcall_mmap_ftype) (CORE_ADDR size, unsigned prot);
+extern CORE_ADDR gdbarch_infcall_mmap (struct gdbarch *gdbarch, CORE_ADDR size, unsigned prot);
+extern void set_gdbarch_infcall_mmap (struct gdbarch *gdbarch, gdbarch_infcall_mmap_ftype *infcall_mmap);
+
+/* Return string (caller has to use xfree for it) with options for GCC
+   to produce code for this target, typically "-m64", "-m32" or "-m31".
+   These options are put before CU's DW_AT_producer compilation options so that
+   they can override it.  Method may also return NULL. */
+
+typedef char * (gdbarch_gcc_target_options_ftype) (struct gdbarch *gdbarch);
+extern char * gdbarch_gcc_target_options (struct gdbarch *gdbarch);
+extern void set_gdbarch_gcc_target_options (struct gdbarch *gdbarch, gdbarch_gcc_target_options_ftype *gcc_target_options);
+
 /* Definition for an unknown syscall, used basically in error-cases.  */
 #define UNKNOWN_SYSCALL (-1)
 
diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index 9f357b6..6b2bc12 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -1029,6 +1029,18 @@ m:int:insn_is_jump:CORE_ADDR addr:addr::default_insn_is_jump::0
 # Return -1 if there is insufficient buffer for a whole entry.
 # Return 1 if an entry was read into *TYPEP and *VALP.
 M:int:auxv_parse:gdb_byte **readptr, gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp:readptr, endptr, typep, valp
+
+# Allocate SIZE bytes of PROT protected page aligned memory in inferior.
+# PROT has rwx bitmask format - bit 2 (value 4) is for readable memory, bit 1
+# (value 2) is for writable memory and bit 0 (value 1) is for executable memory.
+# Throw an error if it is not possible.  Returned address is always valid.
+f:CORE_ADDR:infcall_mmap:CORE_ADDR size, unsigned prot:size, prot::default_infcall_mmap::0
+
+# Return string (caller has to use xfree for it) with options for GCC
+# to produce code for this target, typically "-m64", "-m32" or "-m31".
+# These options are put before CU's DW_AT_producer compilation options so that
+# they can override it.  Method may also return NULL.
+m:char *:gcc_target_options:void:::default_gcc_target_options::0
 EOF
 }
 
-- 
1.9.0