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microblaze: Add infrastructure for supporting hw exceptions. 

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
This commit is contained in:
Edgar E. Iglesias 2009-09-03 10:25:00 +02:00
parent a75cf0c52d
commit cedb936bfc
2 changed files with 49 additions and 3 deletions
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21
target-microblaze/cpu.h
View File

@ -38,6 +38,7 @@ struct CPUMBState;
#define EXCP_IRQ 3
#define EXCP_BREAK 4
#define EXCP_HW_BREAK 5
#define EXCP_HW_EXCP 6
/* Register aliases. R0 - R15 */
#define R_SP 1
@ -77,7 +78,18 @@ struct CPUMBState;
#define ESR_DIZ (1<<11) /* Zone Protection */
#define ESR_S (1<<10) /* Store instruction */
#define ESR_EC_FSL 0
#define ESR_EC_UNALIGNED_DATA 1
#define ESR_EC_ILLEGAL_OP 2
#define ESR_EC_INSN_BUS 3
#define ESR_EC_DATA_BUS 4
#define ESR_EC_DIVZERO 5
#define ESR_EC_FPU 6
#define ESR_EC_PRIVINSN 7
#define ESR_EC_DATA_STORAGE 8
#define ESR_EC_INSN_STORAGE 9
#define ESR_EC_DATA_TLB 10
#define ESR_EC_INSN_TLB 11
/* Version reg. */
/* Basic PVR mask */
@ -198,13 +210,15 @@ typedef struct CPUMBState {
uint32_t sregs[24];
/* Internal flags. */
#define IMM_FLAG 4
#define IMM_FLAG 4
#define MSR_EE_FLAG (1 << 8)
#define DRTI_FLAG (1 << 16)
#define DRTE_FLAG (1 << 17)
#define DRTB_FLAG (1 << 18)
#define D_FLAG (1 << 19) /* Bit in ESR. */
/* TB dependant CPUState. */
#define IFLAGS_TB_MASK (D_FLAG | IMM_FLAG | DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)
#define IFLAGS_TB_MASK (D_FLAG | IMM_FLAG | DRTI_FLAG \
| DRTE_FLAG | DRTB_FLAG | MSR_EE_FLAG)
uint32_t iflags;
struct {
@ -306,6 +320,7 @@ static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
{
*pc = env->sregs[SR_PC];
*cs_base = 0;
env->iflags |= env->sregs[SR_MSR] & MSR_EE;
*flags = env->iflags & IFLAGS_TB_MASK;
}
#endif

31
target-microblaze/helper.c
View File

@ -126,6 +126,37 @@ void do_interrupt(CPUState *env)
assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
/* assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions. */
switch (env->exception_index) {
case EXCP_HW_EXCP:
if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
qemu_log("Exception raised on system without exceptions!\n");
return;
}
env->regs[17] = env->sregs[SR_PC] + 4;
env->sregs[SR_ESR] &= ~(1 << 12);
/* Exception breaks branch + dslot sequence? */
if (env->iflags & D_FLAG) {
env->sregs[SR_ESR] |= 1 << 12 ;
env->sregs[SR_BTR] = env->btarget;
}
/* Disable the MMU. */
t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
env->sregs[SR_MSR] |= t;
/* Exception in progress. */
env->sregs[SR_MSR] |= MSR_EIP;
qemu_log_mask(CPU_LOG_INT,
"hw exception at pc=%x ear=%x esr=%x iflags=%x\n",
env->sregs[SR_PC], env->sregs[SR_EAR],
env->sregs[SR_ESR], env->iflags);
log_cpu_state_mask(CPU_LOG_INT, env, 0);
env->iflags &= ~(IMM_FLAG | D_FLAG);
env->sregs[SR_PC] = 0x20;
break;
case EXCP_MMU:
env->regs[17] = env->sregs[SR_PC];