From: Peter Maydell <peter.mayd...@linaro.org> In CPUSparcState we define the fprs field as uint64_t. However we then refer to it in translate.c via a TCGv_i32 which we set up with tcg_global_mem_new_ptr(). This means that on a big-endian host when the guest does something to writo te the FPRS register this value ends up in the wrong half of the uint64_t, and the QEMU C code that refers to env->fprs sees the wrong value. The effect of this is that guest code that enables the FPU crashes with spurious FPU Disabled exceptions. In particular, this is why tests/avocado/machine_sparc64_sun4u.py:Sun4uMachine.test_sparc64_sun4u times out on an s390 host.
There are multiple ways we could fix this; since there are actually only three bits in the FPRS register and the code in translate.c would be a bit painful to convert to dealing with a TCGv_i64, change the type of the CPU state struct field to match what translate.c is expecting. (None of the other fields referenced by the r32[] array in sparc_tcg_init() have the wrong type.) Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> Reviewed-by: Richard Henderson <richard.hender...@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> Message-Id: <20230717103544.637453-1-peter.mayd...@linaro.org> --- target/sparc/cpu.h | 2 +- target/sparc/cpu.c | 4 ++-- target/sparc/machine.c | 3 ++- target/sparc/monitor.c | 2 +- 4 files changed, 6 insertions(+), 5 deletions(-) diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h index 95d2d0da71..98044572f2 100644 --- a/target/sparc/cpu.h +++ b/target/sparc/cpu.h @@ -521,7 +521,7 @@ struct CPUArchState { uint64_t igregs[8]; /* interrupt general registers */ uint64_t mgregs[8]; /* mmu general registers */ uint64_t glregs[8 * MAXTL_MAX]; - uint64_t fprs; + uint32_t fprs; uint64_t tick_cmpr, stick_cmpr; CPUTimer *tick, *stick; #define TICK_NPT_MASK 0x8000000000000000ULL diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c index e329a7aece..130ab8f578 100644 --- a/target/sparc/cpu.c +++ b/target/sparc/cpu.c @@ -673,8 +673,8 @@ static void sparc_cpu_dump_state(CPUState *cs, FILE *f, int flags) "cleanwin: %d cwp: %d\n", env->cansave, env->canrestore, env->otherwin, env->wstate, env->cleanwin, env->nwindows - 1 - env->cwp); - qemu_fprintf(f, "fsr: " TARGET_FMT_lx " y: " TARGET_FMT_lx " fprs: " - TARGET_FMT_lx "\n", env->fsr, env->y, env->fprs); + qemu_fprintf(f, "fsr: " TARGET_FMT_lx " y: " TARGET_FMT_lx " fprs: %016x\n", + env->fsr, env->y, env->fprs); #else qemu_fprintf(f, "psr: %08x (icc: ", cpu_get_psr(env)); diff --git a/target/sparc/machine.c b/target/sparc/machine.c index 44b9e7d75d..274e1217df 100644 --- a/target/sparc/machine.c +++ b/target/sparc/machine.c @@ -168,7 +168,8 @@ const VMStateDescription vmstate_sparc_cpu = { VMSTATE_UINT64_ARRAY(env.bgregs, SPARCCPU, 8), VMSTATE_UINT64_ARRAY(env.igregs, SPARCCPU, 8), VMSTATE_UINT64_ARRAY(env.mgregs, SPARCCPU, 8), - VMSTATE_UINT64(env.fprs, SPARCCPU), + VMSTATE_UNUSED(4), /* was unused high half of uint64_t fprs */ + VMSTATE_UINT32(env.fprs, SPARCCPU), VMSTATE_UINT64(env.tick_cmpr, SPARCCPU), VMSTATE_UINT64(env.stick_cmpr, SPARCCPU), VMSTATE_CPU_TIMER(env.tick, SPARCCPU), diff --git a/target/sparc/monitor.c b/target/sparc/monitor.c index 318413686a..73f15aa272 100644 --- a/target/sparc/monitor.c +++ b/target/sparc/monitor.c @@ -154,7 +154,7 @@ const MonitorDef monitor_defs[] = { { "otherwin", offsetof(CPUSPARCState, otherwin) }, { "wstate", offsetof(CPUSPARCState, wstate) }, { "cleanwin", offsetof(CPUSPARCState, cleanwin) }, - { "fprs", offsetof(CPUSPARCState, fprs) }, + { "fprs", offsetof(CPUSPARCState, fprs), NULL, MD_I32 }, #endif { NULL }, }; -- 2.38.1