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s390x/tcg: Introduce tcg_s390_vector_exception() 

Handling is similar to data exceptions, however we can always store the
VXC into the lowore and the FPC:

z14 PoP, 6-20, "Vector-Exception Code"
    When a vector-processing exception causes a pro-
    gram interruption, a vector-exception code (VXC) is
    stored at location 147, and zeros are stored at loca-
    tions 144-146. The VXC is also placed in the DXC
    field of the floating-point-control (FPC) register if bit
    45 of control register 0 is one. When bit 45 of control
    register 0 is zero and bit 46 of control register 0 is
    one, the DXC field of the FPC register and the con-
    tents of storage at location 147 are unpredictable.

Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2019-02-22 11:19:48 +01:00
parent e19a61eb51
commit 9be6fa99d6
3 changed files with 18 additions and 0 deletions
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1
target/s390x/cpu.h
View File

@ -215,6 +215,7 @@ extern const struct VMStateDescription vmstate_s390_cpu;
#define PGM_SPECIAL_OP 0x0013
#define PGM_OPERAND 0x0015
#define PGM_TRACE_TABLE 0x0016
#define PGM_VECTOR_PROCESSING 0x001b
#define PGM_SPACE_SWITCH 0x001c
#define PGM_HFP_SQRT 0x001d
#define PGM_PC_TRANS_SPEC 0x001f

15
target/s390x/excp_helper.c
View File

@ -62,6 +62,21 @@ void QEMU_NORETURN tcg_s390_data_exception(CPUS390XState *env, uint32_t dxc,
tcg_s390_program_interrupt(env, PGM_DATA, ILEN_AUTO, ra);
}
void QEMU_NORETURN tcg_s390_vector_exception(CPUS390XState *env, uint32_t vxc,
uintptr_t ra)
{
g_assert(vxc <= 0xff);
#if !defined(CONFIG_USER_ONLY)
/* Always store the VXC into the lowcore, without AFP it is undefined */
stl_phys(CPU(s390_env_get_cpu(env))->as,
env->psa + offsetof(LowCore, data_exc_code), vxc);
#endif
/* Always store the VXC into the FPC, without AFP it is undefined */
env->fpc = deposit32(env->fpc, 8, 8, vxc);
tcg_s390_program_interrupt(env, PGM_VECTOR_PROCESSING, ILEN_AUTO, ra);
}
void HELPER(data_exception)(CPUS390XState *env, uint32_t dxc)
{
tcg_s390_data_exception(env, dxc, GETPC());

2
target/s390x/tcg_s390x.h
View File

@ -18,5 +18,7 @@ void QEMU_NORETURN tcg_s390_program_interrupt(CPUS390XState *env, uint32_t code,
int ilen, uintptr_t ra);
void QEMU_NORETURN tcg_s390_data_exception(CPUS390XState *env, uint32_t dxc,
uintptr_t ra);
void QEMU_NORETURN tcg_s390_vector_exception(CPUS390XState *env, uint32_t vxc,
uintptr_t ra);
#endif /* TCG_S390X_H */