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gdb/riscv: correct dwarf to gdb register number mapping

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According to the riscv psabi, the mapping relationship between the
DWARF registers and the machine registers is as follows:

  DWARF Number | Register Name | Description
  0 - 31       | x0 - x31      | Integer Registers
  32 - 63      | f0 - f31      | Floating-point Registers

This is not modelled quite right in riscv_dwarf_reg_to_regnum, the
DWARF register numbers 31 and 63 are not handled correctly due to a
use of '<' instead of '<='.  This commit fixes this issue.
This commit is contained in:
Xiao Zeng
2022-12-06 14:59:43 +08:00
committed by Andrew Burgess
parent 40849d84cb
commit c8ea5e409b
1 changed files with 2 additions and 2 deletions
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4
gdb/riscv-tdep.c
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@ -3623,10 +3623,10 @@ riscv_add_reggroups (struct gdbarch *gdbarch)
static int
riscv_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
{
if (reg < RISCV_DWARF_REGNUM_X31)
if (reg <= RISCV_DWARF_REGNUM_X31)
return RISCV_ZERO_REGNUM + (reg - RISCV_DWARF_REGNUM_X0);
else if (reg < RISCV_DWARF_REGNUM_F31)
else if (reg <= RISCV_DWARF_REGNUM_F31)
return RISCV_FIRST_FP_REGNUM + (reg - RISCV_DWARF_REGNUM_F0);
else if (reg >= RISCV_DWARF_FIRST_CSR && reg <= RISCV_DWARF_LAST_CSR)