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| author | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-03-30 21:17:14 -0300 |
|---|---|---|
| committer | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-05-05 15:36:16 -0300 |
| commit | 942069e0d2164e8c88a55f36a117a196a3920dc5 (patch) | |
| tree | a83e277e15930e61312a13cdc7b59ead50f08fc5 /target/ppc | |
| parent | e91b8994115d2f093e7556c9af2d051a26a98cfb (diff) | |
| download | qemu-942069e0d2164e8c88a55f36a117a196a3920dc5.zip qemu-942069e0d2164e8c88a55f36a117a196a3920dc5.tar.gz qemu-942069e0d2164e8c88a55f36a117a196a3920dc5.tar.bz2 | |
target/ppc: initialize 'val' union in kvm_get_one_spr()
Valgrind isn't convinced that we are initializing the values we assign
to env->spr[spr] because it doesn't understand that the 'val' union is
being written by the kvm_vcpu_ioctl() that follows (via struct
kvm_one_reg).
This results in Valgrind complaining about uninitialized values every
time we use env->spr in a conditional, like this instance:
==707578== Thread 1:
==707578== Conditional jump or move depends on uninitialised value(s)
==707578== at 0xA10A40: hreg_compute_hflags_value (helper_regs.c:106)
==707578== by 0xA10C9F: hreg_compute_hflags (helper_regs.c:173)
==707578== by 0xA110F7: hreg_store_msr (helper_regs.c:262)
==707578== by 0xA051A3: ppc_cpu_reset (cpu_init.c:7168)
==707578== by 0xD4730F: device_transitional_reset (qdev.c:799)
==707578== by 0xD4A11B: resettable_phase_hold (resettable.c:182)
==707578== by 0xD49A77: resettable_assert_reset (resettable.c:60)
==707578== by 0xD4994B: resettable_reset (resettable.c:45)
==707578== by 0xD458BB: device_cold_reset (qdev.c:296)
==707578== by 0x48FBC7: cpu_reset (cpu-common.c:114)
==707578== by 0x97B5EB: spapr_reset_vcpu (spapr_cpu_core.c:38)
==707578== by 0x97BABB: spapr_cpu_core_reset (spapr_cpu_core.c:209)
==707578== Uninitialised value was created by a stack allocation
==707578== at 0xB11F08: kvm_get_one_spr (kvm.c:543)
Initializing 'val' has no impact in the logic and makes Valgrind output
more bearable.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20220331001717.616938-2-danielhb413@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Diffstat (limited to 'target/ppc')
| -rw-r--r-- | target/ppc/kvm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index a3c31b4..01baea4 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -542,10 +542,11 @@ static void kvm_get_one_spr(CPUState *cs, uint64_t id, int spr) { PowerPCCPU *cpu = POWERPC_CPU(cs); CPUPPCState *env = &cpu->env; + /* Init 'val' to avoid "uninitialised value" Valgrind warnings */ union { uint32_t u32; uint64_t u64; - } val; + } val = { }; struct kvm_one_reg reg = { .id = id, .addr = (uintptr_t) &val, |