[binutils-gdb] [ARM] FDPIC: Add stack segment

[Christophe Lyon]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=cb10292c2a6c26349c02ec275e4087147fd1cdf0

commit cb10292c2a6c26349c02ec275e4087147fd1cdf0
Author: Christophe Lyon <christophe.lyon@st.com>
Date:   Tue Mar 20 10:55:37 2018 +0100

    [ARM] FDPIC: Add stack segment
    
    The size of the stack segment defaults to 32KB, and can be overridden
    by defining the __stacksize symbol.
    
    2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
    	Mickaël Guêné  <mickael.guene@st.com>
    
    	bfd/
    	* elf32-arm.c (DEFAULT_STACK_SIZE): New.
    	(elf32_arm_always_size_sections): Create stack segment.

Diff:
---
 bfd/ChangeLog   |  6 ++++++
 bfd/elf32-arm.c | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 3e5415e..bd7c6ae 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,6 +1,12 @@
 2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
 	Mickaël Guêné  <mickael.guene@st.com>
 
+	* elf32-arm.c (DEFAULT_STACK_SIZE): New.
+	(elf32_arm_always_size_sections): Create stack segment.
+
+2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
+	Mickaël Guêné  <mickael.guene@st.com>
+
 	* bfd-in2.h (BFD_RELOC_ARM_TLS_GD32_FDPIC)
 	(BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC): New
 	relocations.
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index fb29c0c..35b60ed 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -2251,6 +2251,9 @@ typedef unsigned short int insn16;
    section.  */
 #define ELF_DYNAMIC_INTERPRETER     "/usr/lib/ld.so.1"
 
+/* FDPIC default stack size.  */
+#define DEFAULT_STACK_SIZE 0x8000
+
 static const unsigned long tls_trampoline [] =
 {
   0xe08e0000,		/* add r0, lr, r0 */
@@ -16485,6 +16488,7 @@ maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p)
       /* Not an error, just cut short the traversal.  */
       return FALSE;
     }
+
   return TRUE;
 }
 
@@ -16955,6 +16959,9 @@ elf32_arm_always_size_sections (bfd *output_bfd,
 				struct bfd_link_info *info)
 {
   asection *tls_sec;
+  struct elf32_arm_link_hash_table *htab;
+
+  htab = elf32_arm_hash_table (info);
 
   if (bfd_link_relocatable (info))
     return TRUE;
@@ -16987,6 +16994,12 @@ elf32_arm_always_size_sections (bfd *output_bfd,
 	  (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
 	}
     }
+
+  if (htab->fdpic_p && !bfd_link_relocatable (info)
+      && !bfd_elf_stack_segment_size (output_bfd, info,
+				      "__stacksize", DEFAULT_STACK_SIZE))
+    return FALSE;
+
   return TRUE;
 }