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[Bug binutils/28292] New: v850-elf-ld: Opcode "st.b" is cracked in reloc


From: address@hidden
Subject: [Bug binutils/28292] New: v850-elf-ld: Opcode "st.b" is cracked in relocation process
Date: Tue, 31 Aug 2021 06:38:49 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=28292

            Bug ID: 28292
           Summary: v850-elf-ld: Opcode "st.b" is cracked in relocation
                    process
           Product: binutils
           Version: 2.37
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: t-hoshino@pony-e.jp
  Target Milestone: ---

Created attachment 13637
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13637&action=edit
crtE.asm and test.ld

Attached crtE.asm has 2 instruction their uses st.b.
These instructions would be finally identical I guess through relocation by
linker.

However, relocated binary shows two different instruction. 
(second st.b have been replaced by sum of 0x5740 and 0xF06E?)

-- Assembly (from crtE.asm)
    st.b    r10, -0x0F92[r0] -- use immediate
    st.b    r10, VSWC[r0]    -- VSWC externally defined by linker script

-- Linker script (test.ld)
    SECTIONS {  .text 0x00000000 : { *(.text*) }  }
    VSWC = -0x0F92; /* FFFFF06EH */

-- Assemble and link commands
    v850-elf-as crtE.asm -o crtE.o \
    && v850-elf-ld --script=test.ld -o a.out crtE.o

-- v850-elf-objdump -d a.out
    00000000 <__start>:
       0:   40 57 6e f0     st.b    r10, -3986[r0]
       4:   ae 47 00 00     jarl    ffee0004 <VSWC+0xffee0f96>, r8

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