[Bug gdb/31926] New: RISC-V extensions incorrectly disassembled without -march

[Bug gdb/31926] New: RISC-V extensions incorrectly disassembled without -march

[jdek at itanimul dot li]

https://sourceware.org/bugzilla/show_bug.cgi?id=31926

            Bug ID: 31926
           Summary: RISC-V extensions incorrectly disassembled without
                    -march
           Product: gdb
           Version: 14.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: jdek at itanimul dot li
  Target Milestone: ---

RISC-V extensions can be enabled using .option which is used in situations
where some functions may have alternate implementations using them. These
functions can be swapped at runtime based on the available extensions on the
current system whilst the executable itself runs on systems without these
extensions. When this is used, GDB does not properly disassemble functions
containing instructions from extensions enabled with .option.

Example tested on (GDB 14.2):

`marchgc` compiled with: gcc -march=rv64gc -o marchgc marchgc.S

  .option push
  .option arch, +zve64x
  .globl main
  main:
         vsetivli zero, 16, e8, ta, ma
  .option pop

`gdb -ex 'disas main' marchgc`:

     0x0000000000000608 <+0>:   .insn   4, 0xcc087057

`marchgcv` compiled with gcc -march=rv64gcv -o marchgcv marchgcv.S

  .globl main
  main:
         vsetivli zero, 16, e8, ta, ma

`gdb -ex 'disas main' marchgcv`:

     0x0000000000000608 <+0>:   vsetivli        zero,16,e8,m1,ta,ma

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[Bug gdb/31926] RISC-V extensions incorrectly disassembled without -march

[jdek at itanimul dot li]

https://sourceware.org/bugzilla/show_bug.cgi?id=31926

J. Dekker <jdek at itanimul dot li> changed:

           What    |Removed                     |Added
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                 CC|                            |jdek at itanimul dot li

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