Cortex-M profile is only emulable from TCG accelerator. Restrict
the GDBstub features to its availability in order to avoid a link
error when TCG is not enabled:

  Undefined symbols for architecture arm64:
    "_arm_v7m_get_sp_ptr", referenced from:
        _m_sysreg_get in target_arm_gdbstub.c.o
    "_arm_v7m_mrs_control", referenced from:
        _arm_gdb_get_m_systemreg in target_arm_gdbstub.c.o
  ld: symbol(s) not found for architecture arm64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

Fixes: 7d8b28b8b5 ("target/arm: Implement gdbstub m-profile systemreg and secext")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 target/arm/gdbstub.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c
index 655369dc74..2986ed6fc8 100644
--- a/target/arm/gdbstub.c
+++ b/target/arm/gdbstub.c
@@ -554,7 +554,7 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
                                      2, "arm-vfp-sysregs.xml", 0);
         }
     }
-    if (cpu_isar_feature(aa32_mve, cpu)) {
+    if (cpu_isar_feature(aa32_mve, cpu) && tcg_enabled()) {
         gdb_register_coprocessor(cs, mve_gdb_get_reg, mve_gdb_set_reg,
                                  1, "arm-m-profile-mve.xml", 0);
     }
@@ -562,7 +562,7 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
                              arm_gen_dynamic_sysreg_xml(cs, cs->gdb_num_regs),
                              "system-registers.xml", 0);
 
-    if (arm_feature(env, ARM_FEATURE_M)) {
+    if (arm_feature(env, ARM_FEATURE_M) && tcg_enabled()) {
         gdb_register_coprocessor(cs,
             arm_gdb_get_m_systemreg, arm_gdb_set_m_systemreg,
             arm_gen_dynamic_m_systemreg_xml(cs, cs->gdb_num_regs),
-- 
2.38.1

Philippe Mathieu-Daudé <philmd@linaro.org> writes:

> Cortex-M profile is only emulable from TCG accelerator. Restrict
> the GDBstub features to its availability in order to avoid a link
> error when TCG is not enabled:
>
>   Undefined symbols for architecture arm64:
>     "_arm_v7m_get_sp_ptr", referenced from:
>         _m_sysreg_get in target_arm_gdbstub.c.o
>     "_arm_v7m_mrs_control", referenced from:
>         _arm_gdb_get_m_systemreg in target_arm_gdbstub.c.o
>   ld: symbol(s) not found for architecture arm64
>   clang: error: linker command failed with exit code 1 (use -v to see invocation)
>
> Fixes: 7d8b28b8b5 ("target/arm: Implement gdbstub m-profile systemreg and secext")
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro

On 3/22/23 07:29, Philippe Mathieu-Daudé wrote:
> Cortex-M profile is only emulable from TCG accelerator. Restrict
> the GDBstub features to its availability in order to avoid a link
> error when TCG is not enabled:
> 
>    Undefined symbols for architecture arm64:
>      "_arm_v7m_get_sp_ptr", referenced from:
>          _m_sysreg_get in target_arm_gdbstub.c.o
>      "_arm_v7m_mrs_control", referenced from:
>          _arm_gdb_get_m_systemreg in target_arm_gdbstub.c.o
>    ld: symbol(s) not found for architecture arm64
>    clang: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> Fixes: 7d8b28b8b5 ("target/arm: Implement gdbstub m-profile systemreg and secext")
> Signed-off-by: Philippe Mathieu-Daudé<philmd@linaro.org>
> ---
>   target/arm/gdbstub.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~