For xonly, move sha512-ppc.pl's table from text to rodata

OpenBSD/macppc will enforce xonly on PowerPC G5, then libcrypto's
sha256 would crash by SIGSEGV, because it can't read text.

Use ELF relocations "@ha" and "@l" to find the table in rodata.  This
might break the PowerPC asm on a not-ELF platform (like AIX or Mac OS)
if someone would try it there.

ok kettenis@ deraadt@

1 files changed, 7 insertions, 18 deletions

diff --git a/src/lib/libcrypto/sha/asm/sha512-ppc.pl b/src/lib/libcrypto/sha/asm/sha512-ppc.pl
index 2a7d5a0e8b..b5649299dc 100755
--- a/src/lib/libcrypto/sha/asm/sha512-ppc.pl
+++ b/src/lib/libcrypto/sha/asm/sha512-ppc.pl
@@ -220,8 +220,11 @@ $func:
         $LD     $G,`6*$SZ`($ctx)
         $LD     $H,`7*$SZ`($ctx)
 
-        bl      LPICmeup
-LPICedup:
+        bcl     20,31,Lpc
+Lpc:
+        mflr    $Tbl
+        addis   $Tbl,$Tbl,Ltable-Lpc\@ha
+        addi    $Tbl,$Tbl,Ltable-Lpc\@l
         andi.   r0,$inp,3
         bne     Lunaligned
 Laligned:
@@ -377,22 +380,8 @@ $code.=<<___;
         blr
         .long   0
         .byte   0,12,0x14,0,0,0,0,0
-___
-
-# Ugly hack here, because PPC assembler syntax seem to vary too
-# much from platforms to platform...
-$code.=<<___;
-.align  6
-LPICmeup:
-        mflr    r0
-        bcl     20,31,\$+4
-        mflr    $Tbl    ; vvvvvv "distance" between . and 1st data entry
-        addi    $Tbl,$Tbl,`64-8`
-        mtlr    r0
-        blr
-        .long   0
-        .byte   0,12,0x14,0,0,0,0,0
-        .space  `64-9*4`
+        .rodata
+Ltable:
 ___
 $code.=<<___ if ($SZ==8);
         .long   0x428a2f98,0xd728ae22,0x71374491,0x23ef65cd