From: Philippe Mathieu-Daudé <phi...@linaro.org>
Per Peter Maydell analysis [*]:
The hvf_vcpu_exec() function is not documented, but in practice
its caller expects it to return either EXCP_DEBUG (for "this was
a guest debug exception you need to deal with") or something else
(presumably the intention being 0 for OK).
The hvf_sysreg_read() and hvf_sysreg_write() functions are also not
documented, but they return 0 on success, or 1 for a completely
unrecognized sysreg where we've raised the UNDEF exception (but
not if we raised an UNDEF exception for an unrecognized GIC sysreg --
I think this is a bug). We use this return value to decide whether
we need to advance the PC past the insn or not. It's not the same
as the return value we want to return from hvf_vcpu_exec().
Retain the variable as locally scoped but give it a name that
doesn't clash with the other function-scoped variable.
This fixes:
target/arm/hvf/hvf.c:1936:13: error: declaration shadows a local variable
[-Werror,-Wshadow]
int ret = 0;
^
target/arm/hvf/hvf.c:1807:9: note: previous declaration is here
int ret;
^
[*]
https://lore.kernel.org/qemu-devel/cafeaca_e+fu6jkts+w63wr9ccj6btu_ht_ydzwowc0kbkdy...@mail.gmail.com/
Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
Message-ID: <20230904161235.84651-4-phi...@linaro.org>
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Markus Armbruster <arm...@redhat.com>
---
target/arm/hvf/hvf.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 546c0e817f..757e13b0f9 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1934,16 +1934,16 @@ int hvf_vcpu_exec(CPUState *cpu)
uint32_t rt = (syndrome >> 5) & 0x1f;
uint32_t reg = syndrome & SYSREG_MASK;
uint64_t val;
- int ret = 0;
+ int sysreg_ret = 0;
if (isread) {
- ret = hvf_sysreg_read(cpu, reg, rt);
+ sysreg_ret = hvf_sysreg_read(cpu, reg, rt);
} else {
val = hvf_get_reg(cpu, rt);
- ret = hvf_sysreg_write(cpu, reg, val);
+ sysreg_ret = hvf_sysreg_write(cpu, reg, val);
}
- advance_pc = !ret;
+ advance_pc = !sysreg_ret;
break;
}
case EC_WFX_TRAP:
--
2.41.0
