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gdbstub: Clarify no more than @gdb_num_core_regs can be accessed

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Both CPUClass::gdb_read_register() and CPUClass::gdb_write_register()
handlers are called from common gdbstub code, and won't be called with
register index over CPUClass::gdb_num_core_regs:

  int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
  {
      CPUClass *cc = CPU_GET_CLASS(cpu);

      if (reg < cc->gdb_num_core_regs) {
          return cc->gdb_read_register(cpu, buf, reg);
      }
      ...
  }

  static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
  {
      CPUClass *cc = CPU_GET_CLASS(cpu);

      if (reg < cc->gdb_num_core_regs) {
          return cc->gdb_write_register(cpu, mem_buf, reg);
      }
      ...
  }

Clarify that in CPUClass docstring, and remove unreachable code on
the microblaze and openrisc implementations.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250122093028.52416-3-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-01-21 12:12:05 +01:00
parent 82c4d8a3b4
commit 46a2cfc448
3 changed files with 2 additions and 10 deletions
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5
target/openrisc/gdbstub.c
View file

@ -47,14 +47,9 @@ int openrisc_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
int openrisc_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
CPUClass *cc = CPU_GET_CLASS(cs);
CPUOpenRISCState *env = cpu_env(cs);
uint32_t tmp;
if (n > cc->gdb_num_core_regs) {
return 0;
}
tmp = ldl_p(mem_buf);
if (n < 32) {