[PATCH 2/3] Add ILP32 support to gdb.

[Andrew Pinski <apinski@cavium.com>]

This patch adds AARCH64:ilp32 support to gdb and sets
up the correct sizes for some types like pointers and long.
Also sets up the correct linker map offsets for Linux.

2016-08-31  Andrew Pinski  <apinski@cavium.com>

	* aarch64-tdep.h (gdbarch_tdep): Add ilp32 field.
	* aarch64-tdep.c (aarch64_gdbarch_init): Setup ILP32 support.
	Make sure the gdbarches have compatible ilp32 flags.
	Set long and ptr sizes correctly for ilp32.
	* aarch64-linux-tdep.c (aarch64_linux_init_abi):
	Add support for ILP32.
---
 gdb/ChangeLog            |  9 +++++++++
 gdb/aarch64-linux-tdep.c |  8 ++++++--
 gdb/aarch64-tdep.c       | 14 ++++++++++++--
 gdb/aarch64-tdep.h       |  3 +++
 4 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 602a05a..03db9e2 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2015-08-31  Andrew Pinski  <apinski@cavium.com>
+
+	* aarch64-tdep.h (gdbarch_tdep): Add ilp32 field.
+	* aarch64-tdep.c (aarch64_gdbarch_init): Setup ILP32 support.
+	Make sure the gdbarches have compatible ilp32 flags.
+	Set long and ptr sizes correctly for ilp32. 
+	* aarch64-linux-tdep.c (aarch64_linux_init_abi):
+	Add support for ILP32.
+
 2016-08-31  Yao Qi  <yao.qi@linaro.org>
 
 	* record-full.c (record_full_insert_breakpoint): Fix typo.
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index cd220a6..43f959b 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -1000,8 +1000,12 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   linux_init_abi (info, gdbarch);
 
-  set_solib_svr4_fetch_link_map_offsets (gdbarch,
-					 svr4_lp64_fetch_link_map_offsets);
+  if (tdep->ilp32)
+    set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					   svr4_ilp32_fetch_link_map_offsets);
+  else
+    set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					   svr4_lp64_fetch_link_map_offsets);
 
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 3b7e954..1730ef8 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2646,6 +2646,12 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   const struct tdesc_feature *feature;
   int num_regs = 0;
   int num_pseudo_regs = 0;
+  char ilp32 = FALSE;
+
+  if (info.abfd
+      && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
+      && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS32)
+    ilp32 = TRUE;
 
   /* Ensure we always have a target descriptor.  */
   if (!tdesc_has_registers (tdesc))
@@ -2703,6 +2709,9 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
        best_arch != NULL;
        best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
     {
+      /* ILP32 and LP64 are incompatible. */
+      if (gdbarch_tdep (arches->gdbarch)->ilp32 != ilp32)
+	continue;
       /* Found a match.  */
       break;
     }
@@ -2721,6 +2730,7 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   tdep->lowest_pc = 0x20;
   tdep->jb_pc = -1;		/* Longjump support not enabled by default.  */
   tdep->jb_elt_size = 8;
+  tdep->ilp32 = ilp32;
 
   set_gdbarch_push_dummy_call (gdbarch, aarch64_push_dummy_call);
   set_gdbarch_frame_align (gdbarch, aarch64_frame_align);
@@ -2760,9 +2770,9 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_float_bit (gdbarch, 32);
   set_gdbarch_double_bit (gdbarch, 64);
   set_gdbarch_long_double_bit (gdbarch, 128);
-  set_gdbarch_long_bit (gdbarch, 64);
+  set_gdbarch_long_bit (gdbarch, ilp32 ? 32 : 64);
   set_gdbarch_long_long_bit (gdbarch, 64);
-  set_gdbarch_ptr_bit (gdbarch, 64);
+  set_gdbarch_ptr_bit (gdbarch, ilp32 ? 32 : 64);
   set_gdbarch_char_signed (gdbarch, 0);
   set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
   set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h
index a95b613..7b1ce3e 100644
--- a/gdb/aarch64-tdep.h
+++ b/gdb/aarch64-tdep.h
@@ -95,6 +95,9 @@ struct gdbarch_tdep
 
   /* syscall record.  */
   int (*aarch64_syscall_record) (struct regcache *regcache, unsigned long svc_number);
+  /* If this is ILP32 or LP64.  */
+  bool ilp32;
+
 };
 
 extern struct target_desc *tdesc_aarch64;
-- 
2.7.4