arm: Use .data.rel.ro for const data with relocations

Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -1543,6 +1543,7 @@ HAVE_LIST="
     libdc1394_1
     libdc1394_2
     sdl
+    section_data_rel_ro
     threads
     vdpau_x11
     xlib
@@ -3415,6 +3416,7 @@ case $target_os in
         ;;
     android)
         disable symver
+        enable section_data_rel_ro
         SLIB_INSTALL_NAME='$(SLIBNAME)'
         SLIB_INSTALL_LINKS=
         # soname not set on purpose
@@ -3549,6 +3551,7 @@ case $target_os in
         ;;
     linux)
         enable dv1394
+        enable section_data_rel_ro
         ;;
     irix*)
         target_os=irix

libavcodec/arm/fft_fixed_neon.S

@@ -242,7 +242,7 @@ function ff_fft_fixed_calc_neon, export=1
         bx              r3
 endfunc
 
-const   fft_fixed_tab_neon
+const   fft_fixed_tab_neon, relocate=1
         .word fft4_neon
         .word fft8_neon
         .word fft16_neon

libavcodec/arm/fft_neon.S

@@ -348,7 +348,7 @@ function ff_fft_permute_neon, export=1
         pop             {r4,pc}
 endfunc
 
-const   fft_tab_neon
+const   fft_tab_neon, relocate=1
         .word fft4_neon
         .word fft8_neon
         .word fft16_neon

libavcodec/arm/fft_vfp.S

@@ -33,7 +33,7 @@ function ff_fft_calc_vfp, export=1
         movrel  a2, (fft_tab_vfp - 8)
         ldr     pc, [a2, ip, lsl #2]
 endfunc
-const fft_tab_vfp
+const   fft_tab_vfp, relocate=1
         .word   fft4_vfp
         .word   fft8_vfp
         .word   X(ff_fft16_vfp)     @ this one alone is exported

libavutil/arm/asm.S

@@ -89,12 +89,16 @@ FUNC    .func   \name
     .endif
 .endm
 
-.macro  const   name, align=2
+.macro  const   name, align=2, relocate=0
     .macro endconst
 ELF     .size   \name, . - \name
         .purgem endconst
     .endm
+.if HAVE_SECTION_DATA_REL_RO && \relocate
+        .section        .data.rel.ro
+.else
         .section        .rodata
+.endif
         .align          \align
 \name:
 .endm