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[PATCH] CSKY： About PC relative diff relocation

From: Lifang Xia <lifang_xia at c-sky dot com>
To: binutils at sourceware dot org
Cc: Sandra Loosemore <sandra at codesourcery dot com>, 尚云海 <yunhai_shang at c-sky dot com>, 瞿仙淼 <xianmiao_qu at c-sky dot com>
Date: Mon, 10 Sep 2018 10:09:50 +0800
Subject: [PATCH] CSKY： About PC relative diff relocation

Hi everyone,

Here is a patch about PC relative diff relocation in CSKY.

bfd:
            * elf32-csky.c (csky_elf_howto_table): Fill special_function of
            R_CKCORE_PCREL32.
            (csky_elf_relocate_section): Add R_CKCORE_PCREL32 process.
gas:
            * config/tc-csky.c (md_apply_fix): Transmit
            BFD_RELOC_32_PCREL to BFD_RELOC_CKCORE_PCREL32.
            (tc_gen_reloc): Trasmit BFD_RELOC_CKCORE_ADDR32 to
            BFD_RELOC_CKCORE_PCREL32 while pc-relative.
            * config/tc-csky.h (DIFF_EXPR_OK): Define to enable PC relative
            diff relocs.

Can anyone review and commit it?


Thanks.

Lifang.

commit f5b0cb0f62b371bac311c56b19189950b41d01f0
Author: Lifang Xia <lifang_xia@c-sky.com>
Date:   Mon Sep 10 09:38:56 2018 +0800

    csky: Support PC relative diff relocation
    
    Define DIFF_EXPR_OK to Support PC relative diff relocation,
    and add CKCORE_PCREL32 relocation process
    
    bfd:
            * elf32-csky.c (csky_elf_howto_table): Fill special_function of
            R_CKCORE_PCREL32.
            (csky_elf_relocate_section): Add R_CKCORE_PCREL32 process.
    gas:
            * config/tc-csky.c (md_apply_fix): Transmit
            BFD_RELOC_32_PCREL to BFD_RELOC_CKCORE_PCREL32.
            (tc_gen_reloc): Trasmit BFD_RELOC_CKCORE_ADDR32 to
            BFD_RELOC_CKCORE_PCREL32 while pc-relative.
            * config/tc-csky.h (DIFF_EXPR_OK): Define to enable PC relative
            diff relocs.
    
    Change-Id: Ief8739be95944fbb3b582238ecf779036b5f72b2

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index a4991050cd..afa1db6dfc 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2018-09-10  Lifang Xia <lifang_xia@c-sky.com>
+
+	* elf32-csky.c (csky_elf_howto_table): Fill special_function of
+	R_CKCORE_PCREL32.
+	(csky_elf_relocate_section): Add R_CKCORE_PCREL32 process.
+
 2018-09-06  Alan Modra  <amodra@gmail.com>
 
 	PR 23570
diff --git a/bfd/elf32-csky.c b/bfd/elf32-csky.c
index d406b5a624..926166efd0 100644
--- a/bfd/elf32-csky.c
+++ b/bfd/elf32-csky.c
@@ -150,7 +150,7 @@ static reloc_howto_type csky_elf_howto_table[] =
 	 TRUE,                        /* pc_relative */
 	 0,                           /* bitpos */
 	 complain_overflow_dont,      /* complain_on_overflow */
-	 NULL,                        /* special_function */
+	 bfd_elf_generic_reloc,       /* special_function */
 	 "R_CKCORE_PCREL32",          /* name */
 	 FALSE,                       /* partial_inplace */
 	 0x0,                         /* src_mask */
@@ -4307,6 +4307,10 @@ csky_elf_relocate_section (bfd *                  output_bfd,
 	  if (h == NULL && (addend & 0x80000000))
 	    addend &= 0xffffffff;
 	  break;
+
+	case R_CKCORE_PCREL32:
+	  break;
+
 	case R_CKCORE_GOT12:
 	case R_CKCORE_PLT12:
 	case R_CKCORE_GOT_HI16:
@@ -5027,6 +5031,7 @@ csky_elf_relocate_section (bfd *                  output_bfd,
 
       if (howto->size == 2
 	  && (howto->type == R_CKCORE_ADDR32
+	      || howto->type == R_CKCORE_PCREL32
 	      || howto->type == R_CKCORE_GOT32
 	      || howto->type == R_CKCORE_GOTOFF
 	      || howto->type == R_CKCORE_GOTPC
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 310bf6eb33..5b9421abab 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,11 @@
+2018-09-10  Lifang Xia <lifang_xia@c-sky.com>
+	* config/tc-csky.c (md_apply_fix): Transmit BFD_RELOC_32_PCREL to
+	BFD_RELOC_CKCORE_PCREL32.
+	(tc_gen_reloc): Trasmit BFD_RELOC_CKCORE_ADDR32 to
+	BFD_RELOC_CKCORE_PCREL32 while pc-relative.
+	* config/tc-csky.h (DIFF_EXPR_OK): Define to enable PC relative diff
+	relocs.
+
 2018-09-06  Alan Modra  <amodra@gmail.com>
 
 	PR 23570
diff --git a/gas/config/tc-csky.c b/gas/config/tc-csky.c
index bd0672f77c..1c4b44b209 100644
--- a/gas/config/tc-csky.c
+++ b/gas/config/tc-csky.c
@@ -4920,7 +4920,9 @@ md_apply_fix (fixS   *fixP,
   /* We can handle these relocs.  */
   switch (fixP->fx_r_type)
     {
+    case BFD_RELOC_32_PCREL:
     case BFD_RELOC_CKCORE_PCREL32:
+      fixP->fx_r_type = BFD_RELOC_CKCORE_PCREL32;
       break;
     case BFD_RELOC_VTABLE_INHERIT:
       fixP->fx_r_type = BFD_RELOC_CKCORE_GNU_VTINHERIT;
@@ -5133,6 +5135,10 @@ tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP)
 {
   arelent *rel;
 
+  if (fixP->fx_pcrel
+      && fixP->fx_r_type == BFD_RELOC_CKCORE_ADDR32)
+      fixP->fx_r_type = BFD_RELOC_CKCORE_PCREL32;
+
   rel = xmalloc (sizeof (arelent));
   rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
   *rel->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy);
diff --git a/gas/config/tc-csky.h b/gas/config/tc-csky.h
index 4ea0c03331..bb70ca2431 100644
--- a/gas/config/tc-csky.h
+++ b/gas/config/tc-csky.h
@@ -62,6 +62,9 @@
 #define DWARF2_DEFAULT_RETURN_COLUMN 15
 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
 
+/* .-foo gets turned into PC relative relocs.  */
+#define DIFF_EXPR_OK 1
+
 typedef enum
 {
   MAP_UNDEFINED = 0,

Follow-Ups:
- Re: [PATCH] CSKY： About PC relative diff relocation
  - From: Lifang Xia
- Re: [PATCH] CSKY： About PC relative diff relocation
  - From: Nick Clifton

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