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target/m68k: manage 680x0 stack frames 

680x0 manages several stack frame formats:
  - format 0: four-word stack frame
  - format 1: four-word throwaway stack frame
  - format 2: six-word stack frame
  - format 3: Floating-Point post-instruction stack frame
  - format 4: eight-word stack frame
  - format 7: access-error stack frame

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180104012913.30763-7-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-01-04 02:29:02 +01:00
parent 5beb144e04
commit d2f8fb8e7f
3 changed files with 164 additions and 7 deletions
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1
target/m68k/cpu.h
View File

@ -178,6 +178,7 @@ int cpu_m68k_signal_handler(int host_signum, void *pinfo,
void *puc);
uint32_t cpu_m68k_get_ccr(CPUM68KState *env);
void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t);
void cpu_m68k_set_sr(CPUM68KState *env, uint32_t);
void cpu_m68k_set_fpcr(CPUM68KState *env, uint32_t val);

10
target/m68k/helper.c
View File

@ -316,13 +316,17 @@ uint32_t HELPER(sats)(uint32_t val, uint32_t v)
return val;
}
void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
void cpu_m68k_set_sr(CPUM68KState *env, uint32_t sr)
{
env->sr = val & 0xffe0;
cpu_m68k_set_ccr(env, val);
env->sr = sr & 0xffe0;
cpu_m68k_set_ccr(env, sr);
m68k_switch_sp(env);
}
void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
{
cpu_m68k_set_sr(env, val);
}
/* MAC unit. */
/* FIXME: The MAC unit implementation is a bit of a mess. Some helpers

160
target/m68k/op_helper.c
View File

@ -54,7 +54,7 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
}
}
static void do_rte(CPUM68KState *env)
static void cf_rte(CPUM68KState *env)
{
uint32_t sp;
uint32_t fmt;
@ -65,7 +65,46 @@ static void do_rte(CPUM68KState *env)
sp |= (fmt >> 28) & 3;
env->aregs[7] = sp + 8;
helper_set_sr(env, fmt);
cpu_m68k_set_sr(env, fmt);
}
static void m68k_rte(CPUM68KState *env)
{
uint32_t sp;
uint16_t fmt;
uint16_t sr;
sp = env->aregs[7];
throwaway:
sr = cpu_lduw_kernel(env, sp);
sp += 2;
env->pc = cpu_ldl_kernel(env, sp);
sp += 4;
if (m68k_feature(env, M68K_FEATURE_QUAD_MULDIV)) {
/* all except 68000 */
fmt = cpu_lduw_kernel(env, sp);
sp += 2;
switch (fmt >> 12) {
case 0:
break;
case 1:
env->aregs[7] = sp;
cpu_m68k_set_sr(env, sr);
goto throwaway;
case 2:
case 3:
sp += 4;
break;
case 4:
sp += 8;
break;
case 7:
sp += 52;
break;
}
}
env->aregs[7] = sp;
cpu_m68k_set_sr(env, sr);
}
static const char *m68k_exception_name(int index)
@ -173,7 +212,7 @@ static const char *m68k_exception_name(int index)
return "Unassigned";
}
static void do_interrupt_all(CPUM68KState *env, int is_hw)
static void cf_interrupt_all(CPUM68KState *env, int is_hw)
{
CPUState *cs = CPU(m68k_env_get_cpu(env));
uint32_t sp;
@ -189,7 +228,7 @@ static void do_interrupt_all(CPUM68KState *env, int is_hw)
switch (cs->exception_index) {
case EXCP_RTE:
/* Return from an exception. */
do_rte(env);
cf_rte(env);
return;
case EXCP_HALT_INSN:
if (semihosting_enabled()
@ -247,6 +286,119 @@ static void do_interrupt_all(CPUM68KState *env, int is_hw)
env->pc = cpu_ldl_kernel(env, env->vbr + vector);
}
static inline void do_stack_frame(CPUM68KState *env, uint32_t *sp,
uint16_t format, uint16_t sr,
uint32_t addr, uint32_t retaddr)
{
CPUState *cs = CPU(m68k_env_get_cpu(env));
switch (format) {
case 4:
*sp -= 4;
cpu_stl_kernel(env, *sp, env->pc);
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
case 3:
case 2:
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
}
*sp -= 2;
cpu_stw_kernel(env, *sp, (format << 12) + (cs->exception_index << 2));
*sp -= 4;
cpu_stl_kernel(env, *sp, retaddr);
*sp -= 2;
cpu_stw_kernel(env, *sp, sr);
}
static void m68k_interrupt_all(CPUM68KState *env, int is_hw)
{
CPUState *cs = CPU(m68k_env_get_cpu(env));
uint32_t sp;
uint32_t retaddr;
uint32_t vector;
uint16_t sr, oldsr;
retaddr = env->pc;
if (!is_hw) {
switch (cs->exception_index) {
case EXCP_RTE:
/* Return from an exception. */
m68k_rte(env);
return;
case EXCP_TRAP0 ... EXCP_TRAP15:
/* Move the PC after the trap instruction. */
retaddr += 2;
break;
}
}
vector = cs->exception_index << 2;
sr = env->sr | cpu_m68k_get_ccr(env);
if (qemu_loglevel_mask(CPU_LOG_INT)) {
static int count;
qemu_log("INT %6d: %s(%#x) pc=%08x sp=%08x sr=%04x\n",
++count, m68k_exception_name(cs->exception_index),
vector, env->pc, env->aregs[7], sr);
}
/*
* MC68040UM/AD, chapter 9.3.10
*/
/* "the processor first make an internal copy" */
oldsr = sr;
/* "set the mode to supervisor" */
sr |= SR_S;
/* "suppress tracing" */
sr &= ~SR_T;
/* "sets the processor interrupt mask" */
if (is_hw) {
sr |= (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
}
cpu_m68k_set_sr(env, sr);
sp = env->aregs[7];
sp &= ~1;
if (cs->exception_index == EXCP_ADDRESS) {
do_stack_frame(env, &sp, 2, oldsr, 0, retaddr);
} else if (cs->exception_index == EXCP_ILLEGAL ||
cs->exception_index == EXCP_DIV0 ||
cs->exception_index == EXCP_CHK ||
cs->exception_index == EXCP_TRAPCC ||
cs->exception_index == EXCP_TRACE) {
/* FIXME: addr is not only env->pc */
do_stack_frame(env, &sp, 2, oldsr, env->pc, retaddr);
} else if (is_hw && oldsr & SR_M &&
cs->exception_index >= EXCP_SPURIOUS &&
cs->exception_index <= EXCP_INT_LEVEL_7) {
do_stack_frame(env, &sp, 0, oldsr, 0, retaddr);
oldsr = sr;
env->aregs[7] = sp;
cpu_m68k_set_sr(env, sr &= ~SR_M);
sp = env->aregs[7] & ~1;
do_stack_frame(env, &sp, 1, oldsr, 0, retaddr);
} else {
do_stack_frame(env, &sp, 0, oldsr, 0, retaddr);
}
env->aregs[7] = sp;
/* Jump to vector. */
env->pc = cpu_ldl_kernel(env, env->vbr + vector);
}
static void do_interrupt_all(CPUM68KState *env, int is_hw)
{
if (m68k_feature(env, M68K_FEATURE_M68000)) {
m68k_interrupt_all(env, is_hw);
return;
}
cf_interrupt_all(env, is_hw);
}
void m68k_cpu_do_interrupt(CPUState *cs)
{
M68kCPU *cpu = M68K_CPU(cs);