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target/microblaze: Reduce linux-user address space to 32-bit

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User-space programs cannot use the 64-bit lwea/swea instructions.
We can improve code generation and runtime by restricting the
user-only address space to 32-bit.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-25 12:37:12 -07:00
parent e269b4bdf2
commit 19f27b6c24
4 changed files with 45 additions and 4 deletions
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15
target/microblaze/cpu-param.h
View file

@ -8,9 +8,24 @@
#ifndef MICROBLAZE_CPU_PARAM_H
#define MICROBLAZE_CPU_PARAM_H 1
/*
* While system mode can address up to 64 bits of address space,
* this is done via the lea/sea instructions, which are system-only
* (as they also bypass the mmu).
*
* We can improve the user-only experience by only exposing 32 bits
* of address space.
*/
#ifdef CONFIG_USER_ONLY
#define TARGET_LONG_BITS 32
#define TARGET_PHYS_ADDR_SPACE_BITS 32
#define TARGET_VIRT_ADDR_SPACE_BITS 32
#else
#define TARGET_LONG_BITS 64
#define TARGET_PHYS_ADDR_SPACE_BITS 64
#define TARGET_VIRT_ADDR_SPACE_BITS 64
#endif
/* FIXME: MB uses variable pages down to 1K but linux only uses 4k. */
#define TARGET_PAGE_BITS 12
#define NB_MMU_MODES 3

2
target/microblaze/cpu.h
View file

@ -242,7 +242,7 @@ struct CPUMBState {
uint32_t pc;
uint32_t msr; /* All bits of MSR except MSR[C] and MSR[CC] */
uint32_t msr_c; /* MSR[C], in low bit; other bits must be 0 */
uint64_t ear;
target_ulong ear;
uint32_t esr;
uint32_t fsr;
uint32_t btr;

4
target/microblaze/helper.c
View file

@ -303,8 +303,8 @@ void mb_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
iflags = cpu->env.iflags;
qemu_log_mask(CPU_LOG_INT,
"Unaligned access addr=" TARGET_FMT_lx
" pc=%x iflags=%x\n", addr, cpu->env.pc, iflags);
"Unaligned access addr=" TARGET_FMT_lx " pc=%x iflags=%x\n",
(target_ulong)addr, cpu->env.pc, iflags);
esr = ESR_EC_UNALIGNED_DATA;
if (likely(iflags & ESR_ESS_FLAG)) {

28
target/microblaze/translate.c
View file

@ -687,6 +687,7 @@ static TCGv compute_ldst_addr_typeb(DisasContext *dc, int ra, int imm)
return ret;
}
#ifndef CONFIG_USER_ONLY
static TCGv compute_ldst_addr_ea(DisasContext *dc, int ra, int rb)
{
int addr_size = dc->cpu->cfg.addr_size;
@ -712,6 +713,7 @@ static TCGv compute_ldst_addr_ea(DisasContext *dc, int ra, int rb)
}
return ret;
}
#endif
static void record_unaligned_ess(DisasContext *dc, int rd,
MemOp size, bool store)
@ -776,8 +778,12 @@ static bool trans_lbuea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_load(dc, arg->rd, addr, MO_UB, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_lbui(DisasContext *dc, arg_typeb *arg)
@ -803,8 +809,12 @@ static bool trans_lhuea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_load(dc, arg->rd, addr, MO_TEUW, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_lhui(DisasContext *dc, arg_typeb *arg)
@ -830,8 +840,12 @@ static bool trans_lwea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_load(dc, arg->rd, addr, MO_TEUL, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_lwi(DisasContext *dc, arg_typeb *arg)
@ -910,8 +924,12 @@ static bool trans_sbea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_store(dc, arg->rd, addr, MO_UB, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_sbi(DisasContext *dc, arg_typeb *arg)
@ -937,8 +955,12 @@ static bool trans_shea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_store(dc, arg->rd, addr, MO_TEUW, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_shi(DisasContext *dc, arg_typeb *arg)
@ -964,8 +986,12 @@ static bool trans_swea(DisasContext *dc, arg_typea *arg)
if (trap_userspace(dc, true)) {
return true;
}
#ifdef CONFIG_USER_ONLY
return true;
#else
TCGv addr = compute_ldst_addr_ea(dc, arg->ra, arg->rb);
return do_store(dc, arg->rd, addr, MO_TEUL, MMU_NOMMU_IDX, false);
#endif
}
static bool trans_swi(DisasContext *dc, arg_typeb *arg)
@ -1818,7 +1844,7 @@ void mb_cpu_dump_state(CPUState *cs, FILE *f, int flags)
}
qemu_fprintf(f, "\nesr=0x%04x fsr=0x%02x btr=0x%08x edr=0x%x\n"
"ear=0x%016" PRIx64 " slr=0x%x shr=0x%x\n",
"ear=0x" TARGET_FMT_lx " slr=0x%x shr=0x%x\n",
env->esr, env->fsr, env->btr, env->edr,
env->ear, env->slr, env->shr);