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M68k system mode semihosting.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2861 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2007-05-26 15:09:38 +00:00
parent 20c9f095c4
commit a87295e8df
13 changed files with 415 additions and 283 deletions
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3
target-m68k/cpu.h
View file

@ -51,6 +51,7 @@
#define EXCP_ICE 13
#define EXCP_RTE 0x100
#define EXCP_HALT_INSN 0x101
typedef struct CPUM68KState {
uint32_t dregs[8];
@ -148,6 +149,8 @@ void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
#define M68K_FPCR_PREC (1 << 6)
void do_m68k_semihosting(CPUM68KState *env, int nr);
#ifdef CONFIG_USER_ONLY
/* Linux uses 8k pages. */
#define TARGET_PAGE_BITS 13

7
target-m68k/op.c
View file

@ -383,7 +383,14 @@ OP(divs)
FORCE_RET();
}
/* Halt is special because it may be a semihosting call. */
OP(halt)
{
RAISE_EXCEPTION(EXCP_HALT_INSN);
FORCE_RET();
}
OP(stop)
{
env->halted = 1;
RAISE_EXCEPTION(EXCP_HLT);

16
target-m68k/op_helper.c
View file

@ -28,6 +28,8 @@ void do_interrupt(int is_hw)
#else
extern int semihosting_enabled;
#define MMUSUFFIX _mmu
#define GETPC() (__builtin_return_address(0))
@ -104,6 +106,20 @@ void do_interrupt(int is_hw)
/* Return from an exception. */
do_rte();
return;
case EXCP_HALT_INSN:
if (semihosting_enabled
&& (env->sr & SR_S) != 0
&& (env->pc & 3) == 0
&& lduw_code(env->pc - 4) == 0x4e71
&& ldl_code(env->pc) == 0x4e7bf000) {
env->pc += 4;
do_m68k_semihosting(env, env->dregs[0]);
return;
}
env->halted = 1;
env->exception_index = EXCP_HLT;
cpu_loop_exit();
return;
}
if (env->exception_index >= EXCP_TRAP0
&& env->exception_index <= EXCP_TRAP15) {

4
target-m68k/translate.c
View file

@ -1901,7 +1901,6 @@ DISAS_INSN(move_to_usp)
DISAS_INSN(halt)
{
gen_flush_cc_op(s);
gen_jmp(s, gen_im32(s->pc));
gen_op_halt();
}
@ -1919,7 +1918,8 @@ DISAS_INSN(stop)
s->pc += 2;
gen_set_sr_im(s, ext, 0);
disas_halt(s, insn);
gen_jmp(s, gen_im32(s->pc));
gen_op_stop();
}
DISAS_INSN(rte)