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List:       binutils-bugs
Subject:    [Bug gas/20744] New: [PPC] Incorrect relocation for VLE-instructions
From:       "volodia () hex-rays ! com" <sourceware-bugzilla () sourceware ! org>
Date:       2016-10-29 11:25:59
Message-ID: bug-20744-70 () http ! sourceware ! org/bugzilla/
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https://sourceware.org/bugzilla/show_bug.cgi?id=20744

            Bug ID: 20744
           Summary: [PPC] Incorrect relocation for VLE-instructions
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: volodia@hex-rays.com
  Target Milestone: ---

According to "Power ISA Version 2.07, Book VLE, 5.9" for the VLE-instruction
"e_lis" an immediate operand is coded in bits 11..15 and 21..31 so to store it
the relocation of type 16A (R_PPC_VLE_HI16A) should be used.
But gas generates an object file which uses the relocation R_PPC_VLE_HI16D.
The bug is in "2012-05-14 James Lemke Add support for PowerPC VLE."
Variables "use_d_reloc" and "use_a_reloc" are interchanged.

The test (ppc_vle_2.s):
# powerpc64-linux-gnu-as -o ppc_vle_2.o -a32 -mvle ppc_vle_2.s
        .section        ".text"
        .align 2
        .globl func
        .type   func, @function
byte_4000D46F:
        .byte     1, 2
func:
        e_lis     7, byte_4000D46F@ha
        e_lbz     7, byte_4000D46F@l(7)
        e_xori    0, 7, 0x80
        cntlzw    3, 0
        se_srwi   3, 5
        se_blr

The result (readelf -r ppc_vle_2.o):
Relocation section '.rela.text' at offset 0xe8 contains 2 entries:
 Offset     Info    Type            Sym.Value  Sym. Name + Addend
00000002  000001e0 R_PPC_VLE_HA16D   00000000   .text + 0
00000008  00000104 R_PPC_ADDR16_LO   00000000   .text + 0

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