[Bug gas/31115] New: [ARM] The minimalistic DWARF DIE for function has wrong address in Thumb mode

[thiago.bauermann at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31115

            Bug ID: 31115
           Summary: [ARM] The minimalistic DWARF DIE for function has
                    wrong address in Thumb mode
           Product: binutils
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: thiago.bauermann at linaro dot org
  Target Milestone: ---

Commit 591cc9fbbfd6 ("gas/Dwarf: record functions") introduced
minimalistic DWARF symbols for functions which have their size specified.

Unfortunately in Arm Thumb mode the minimalistic symbol has the LSB bit
set. This is indeed the convention for ELF symbols to denote a function
using Thumb instructions but isn't used for DWARF symbols, where
DW_AT_low_pc should contain the actual function address.

This causes a failure in GDB testcase gdb.arch/pr25124.exp:

(gdb) x /i main+8
   0x10521 <main+7>:    vrhadd.u16      d14, d14, d31
(gdb) FAIL: gdb.arch/pr25124.exp: disassemble thumb instruction (1st try)

Whereas when using a gas version not affected by the bug:

(gdb) x /i main+8
   0x10520 <main+8>:    bx      lr
(gdb) PASS: gdb.arch/pr25124.exp: disassemble thumb instruction (1st try)

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