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[PATCH 03/23] Add dynamic ILP32 AARCH64 relocations to elf.h

From: Yury Norov <ynorov at caviumnetworks dot com>
To: <libc-alpha at sourceware dot org>, <linux-kernel at vger dot kernel dot org>
Cc: <arnd at arndb dot de>, <catalin dot marinas at arm dot com>, <marcus dot shawcroft at arm dot com>, <philb at gnu dot org>, <davem at davemloft dot net>, <szabolcs dot nagy at arm dot com>, <maxim dot kuvyrkov at linaro dot org>, <joseph at codesourcery dot com>, <pinskia at gmail dot com>, <bamvor dot zhangjian at huawei dot com>, <schwab at suse dot de>, <fweimer at redhat dot com>, <Prasun dot Kapoor at cavium dot com>, <cmetcalf at mellanox dot com>, <hjl dot tools at gmail dot com>, <adhemerval dot zanella at linaro dot org>, Andrew Pinski <apinski at cavium dot com>, Yury Norov <ynorov at caviumnetworks dot com>
Date: Tue, 28 Jun 2016 19:39:18 +0300
Subject: [PATCH 03/23] Add dynamic ILP32 AARCH64 relocations to elf.h
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Authentication-results: spf=none (sender IP is ) smtp dot mailfrom=Yuri dot Norov at caviumnetworks dot com;
References: <1467131978-669-1-git-send-email-ynorov at caviumnetworks dot com>
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From: Andrew Pinski <apinski@cavium.com>

elf/elf.h (R_AARCH64_P32_ABS32, R_AARCH64_P32_COPY,
R_AARCH64_P32_GLOB_DAT, R_AARCH64_P32_JUMP_SLOT,
R_AARCH64_P32_RELATIVE, R_AARCH64_P32_TLS_DTPMOD,
R_AARCH64_P32_TLS_DTPREL, R_AARCH64_P32_TLS_TPREL,
R_AARCH64_P32_TLSDESC, R_AARCH64_P32_IRELATIVE): Define.

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
 sysdeps/aarch64/dl-irel.h    |  3 ++-
 sysdeps/aarch64/dl-machine.h | 53 +++++++++++++++++++++++---------------------
 sysdeps/aarch64/sysdep.h     |  6 +++++
 3 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/sysdeps/aarch64/dl-irel.h b/sysdeps/aarch64/dl-irel.h
index 63a8e50..460454f 100644
--- a/sysdeps/aarch64/dl-irel.h
+++ b/sysdeps/aarch64/dl-irel.h
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <ldsodefs.h>
+#include <sysdep.h>
 
 #define ELF_MACHINE_IRELA	1
 
@@ -40,7 +41,7 @@ elf_irela (const ElfW(Rela) *reloc)
   ElfW(Addr) *const reloc_addr = (void *) reloc->r_offset;
   const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
 
-  if (__glibc_likely (r_type == R_AARCH64_IRELATIVE))
+  if (__glibc_likely (r_type == AARCH64_R(IRELATIVE)))
     {
       ElfW(Addr) value = elf_ifunc_invoke (reloc->r_addend);
       *reloc_addr = value;
diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h
index 282805e..a16cb11 100644
--- a/sysdeps/aarch64/dl-machine.h
+++ b/sysdeps/aarch64/dl-machine.h
@@ -21,6 +21,7 @@
 
 #define ELF_MACHINE_NAME "aarch64"
 
+#include <sysdep.h>
 #include <tls.h>
 #include <dl-tlsdesc.h>
 #include <dl-irel.h>
@@ -190,15 +191,15 @@ _dl_start_user:							\n\
 ");
 
 #define elf_machine_type_class(type)					\
-  ((((type) == R_AARCH64_JUMP_SLOT ||					\
-     (type) == R_AARCH64_TLS_DTPMOD ||					\
-     (type) == R_AARCH64_TLS_DTPREL ||					\
-     (type) == R_AARCH64_TLS_TPREL ||					\
-     (type) == R_AARCH64_TLSDESC) * ELF_RTYPE_CLASS_PLT)		\
-   | (((type) == R_AARCH64_COPY) * ELF_RTYPE_CLASS_COPY)		\
-   | (((type) == R_AARCH64_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
+  ((((type) == AARCH64_R(JUMP_SLOT) ||					\
+     (type) == AARCH64_R(TLS_DTPMOD) ||					\
+     (type) == AARCH64_R(TLS_DTPREL) ||					\
+     (type) == AARCH64_R(TLS_TPREL) ||					\
+     (type) == AARCH64_R(TLSDESC)) * ELF_RTYPE_CLASS_PLT)		\
+   | (((type) == AARCH64_R(COPY)) * ELF_RTYPE_CLASS_COPY)		\
+   | (((type) == AARCH64_R(GLOB_DAT)) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
 
-#define ELF_MACHINE_JMP_SLOT	R_AARCH64_JUMP_SLOT
+#define ELF_MACHINE_JMP_SLOT	AARCH64_R(JUMP_SLOT)
 
 /* AArch64 uses RELA not REL */
 #define ELF_MACHINE_NO_REL 1
@@ -237,9 +238,9 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 		  void *const reloc_addr_arg, int skip_ifunc)
 {
   ElfW(Addr) *const reloc_addr = reloc_addr_arg;
-  const unsigned int r_type = ELF64_R_TYPE (reloc->r_info);
+  const unsigned int r_type = ELFW(R_TYPE) (reloc->r_info);
 
-  if (__builtin_expect (r_type == R_AARCH64_RELATIVE, 0))
+  if (__builtin_expect (r_type == AARCH64_R(RELATIVE), 0))
       *reloc_addr = map->l_addr + reloc->r_addend;
   else if (__builtin_expect (r_type == R_AARCH64_NONE, 0))
       return;
@@ -257,7 +258,7 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 
       switch (r_type)
 	{
-	case R_AARCH64_COPY:
+	case AARCH64_R(COPY):
 	  if (sym == NULL)
 	      break;
 
@@ -275,15 +276,17 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 		  MIN (sym->st_size, refsym->st_size));
 	  break;
 
-	case R_AARCH64_RELATIVE:
-	case R_AARCH64_GLOB_DAT:
-	case R_AARCH64_JUMP_SLOT:
-	case R_AARCH64_ABS32:
-	case R_AARCH64_ABS64:
+	case AARCH64_R(RELATIVE):
+	case AARCH64_R(GLOB_DAT):
+	case AARCH64_R(JUMP_SLOT):
+	case AARCH64_R(ABS32):
+#ifdef __LP64__
+	case AARCH64_R(ABS64):
+#endif
 	  *reloc_addr = value + reloc->r_addend;
 	  break;
 
-	case R_AARCH64_TLSDESC:
+	case AARCH64_R(TLSDESC):
 	  {
 	    struct tlsdesc volatile *td =
 	      (struct tlsdesc volatile *)reloc_addr;
@@ -318,7 +321,7 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 	    break;
 	  }
 
-	case R_AARCH64_TLS_DTPMOD:
+	case AARCH64_R(TLS_DTPMOD):
 #ifdef RTLD_BOOTSTRAP
 	  *reloc_addr = 1;
 #else
@@ -329,12 +332,12 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 #endif
 	  break;
 
-	case R_AARCH64_TLS_DTPREL:
+	case AARCH64_R(TLS_DTPREL):
 	  if (sym)
 	    *reloc_addr = sym->st_value + reloc->r_addend;
 	  break;
 
-	case R_AARCH64_TLS_TPREL:
+	case AARCH64_R(TLS_TPREL):
 	  if (sym)
 	    {
 	      CHECK_STATIC_TLS (map, sym_map);
@@ -343,7 +346,7 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
 	    }
 	  break;
 
-	case R_AARCH64_IRELATIVE:
+	case AARCH64_R(IRELATIVE):
 	  value = map->l_addr + reloc->r_addend;
 	  value = elf_ifunc_invoke (value);
 	  *reloc_addr = value;
@@ -374,16 +377,16 @@ elf_machine_lazy_rel (struct link_map *map,
 		      int skip_ifunc)
 {
   ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
-  const unsigned int r_type = ELF64_R_TYPE (reloc->r_info);
+  const unsigned int r_type = ELFW(R_TYPE) (reloc->r_info);
   /* Check for unexpected PLT reloc type.  */
-  if (__builtin_expect (r_type == R_AARCH64_JUMP_SLOT, 1))
+  if (__builtin_expect (r_type == AARCH64_R(JUMP_SLOT), 1))
     {
       if (__builtin_expect (map->l_mach.plt, 0) == 0)
 	*reloc_addr += l_addr;
       else
 	*reloc_addr = map->l_mach.plt;
     }
-  else if (__builtin_expect (r_type == R_AARCH64_TLSDESC, 1))
+  else if (__builtin_expect (r_type == AARCH64_R(TLSDESC), 1))
     {
       struct tlsdesc volatile *td =
 	(struct tlsdesc volatile *)reloc_addr;
@@ -392,7 +395,7 @@ elf_machine_lazy_rel (struct link_map *map,
       td->entry = (void*)(D_PTR (map, l_info[ADDRIDX (DT_TLSDESC_PLT)])
 			  + map->l_addr);
     }
-  else if (__glibc_unlikely (r_type == R_AARCH64_IRELATIVE))
+  else if (__glibc_unlikely (r_type == AARCH64_R(IRELATIVE)))
     {
       ElfW(Addr) value = map->l_addr + reloc->r_addend;
       if (__glibc_likely (!skip_ifunc))
diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h
index 594ab0b..05d6f8e 100644
--- a/sysdeps/aarch64/sysdep.h
+++ b/sysdeps/aarch64/sysdep.h
@@ -21,6 +21,12 @@
 
 #include <sysdeps/generic/sysdep.h>
 
+#ifdef __LP64__
+# define AARCH64_R(NAME)	R_AARCH64_ ## NAME
+#else
+# define AARCH64_R(NAME)	R_AARCH64_P32_ ## NAME
+#endif
+
 #ifdef	__ASSEMBLER__
 
 /* Syntactic details of assembler.  */
-- 
2.7.4

Follow-Ups:
- Re: [PATCH 03/23] Add dynamic ILP32 AARCH64 relocations to elf.h
  - From: Joseph Myers

References:
- [RFC2 PATCH 00/23] ARM64: support ILP32
  - From: Yury Norov

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