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cpu: Move icount_decr to CPUNegativeOffsetState

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Amusingly, we had already ignored the comment to keep this value
at the end of CPUState.  This restores the minimum negative offset
from TCG_AREG0 for code generation.

For the couple of uses within qom/cpu.c, without NEED_CPU_H, add
a pointer from the CPUState object to the IcountDecr object within
CPUNegativeOffsetState.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-03-28 11:54:23 -10:00
parent 5b146dc716
commit 5e1401969b
9 changed files with 56 additions and 54 deletions
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1
include/exec/cpu-all.h
View file

@ -380,6 +380,7 @@ int cpu_exec(CPUState *cpu);
static inline void cpu_set_cpustate_pointers(ArchCPU *cpu)
{
cpu->parent_obj.env_ptr = &cpu->env;
cpu->parent_obj.icount_decr_ptr = &cpu->neg.icount_decr;
}
/**

3
include/exec/cpu-defs.h
View file

@ -33,6 +33,7 @@
#include "exec/hwaddr.h"
#endif
#include "exec/memattrs.h"
#include "qom/cpu.h"
#include "cpu-param.h"
@ -232,7 +233,7 @@ typedef struct CPUTLB {
* before CPUArchState, as a field named "neg".
*/
typedef struct CPUNegativeOffsetState {
/* Empty */
IcountDecr icount_decr;
} CPUNegativeOffsetState;
#endif

16
include/exec/gen-icount.h
View file

@ -5,8 +5,6 @@
/* Helpers for instruction counting code generation. */
#define ENV_OFFSET offsetof(ArchCPU, env)
static TCGOp *icount_start_insn;
static inline void gen_tb_start(TranslationBlock *tb)
@ -21,7 +19,8 @@ static inline void gen_tb_start(TranslationBlock *tb)
}
tcg_gen_ld_i32(count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
offsetof(ArchCPU, neg.icount_decr.u32) -
offsetof(ArchCPU, env));
if (tb_cflags(tb) & CF_USE_ICOUNT) {
imm = tcg_temp_new_i32();
@ -39,7 +38,8 @@ static inline void gen_tb_start(TranslationBlock *tb)
if (tb_cflags(tb) & CF_USE_ICOUNT) {
tcg_gen_st16_i32(count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
offsetof(ArchCPU, neg.icount_decr.u16.low) -
offsetof(ArchCPU, env));
}
tcg_temp_free_i32(count);
@ -60,14 +60,18 @@ static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
static inline void gen_io_start(void)
{
TCGv_i32 tmp = tcg_const_i32(1);
tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_gen_st_i32(tmp, cpu_env,
offsetof(ArchCPU, parent_obj.can_do_io) -
offsetof(ArchCPU, env));
tcg_temp_free_i32(tmp);
}
static inline void gen_io_end(void)
{
TCGv_i32 tmp = tcg_const_i32(0);
tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_gen_st_i32(tmp, cpu_env,
offsetof(ArchCPU, parent_obj.can_do_io) -
offsetof(ArchCPU, env));
tcg_temp_free_i32(tmp);
}