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unicore32-softmmu: Make sure that kernel can access user space 

As a matter of course, we need to access user space in kernel code,
so we need to correct load/store decoders to indicate correct memory
region.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Guan Xuetao 2012-08-10 14:42:26 +08:00 committed by Blue Swirl
parent f3ccc32369
commit ef03168a85
1 changed files with 26 additions and 10 deletions
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36
target-unicore32/translate.c
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@ -33,9 +33,16 @@ typedef struct DisasContext {
int condlabel;
struct TranslationBlock *tb;
int singlestep_enabled;
#ifndef CONFIG_USER_ONLY
int user;
#endif
} DisasContext;
#define IS_USER(s) 1
#ifndef CONFIG_USER_ONLY
#define IS_USER(s) (s->user)
#else
#define IS_USER(s) 1
#endif
/* These instructions trap after executing, so defer them until after the
conditional executions state has been updated. */
@ -1554,12 +1561,12 @@ static void do_misc(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
/* load/store I_offset and R_offset */
static void do_ldst_ir(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
{
unsigned int i;
unsigned int mmu_idx;
TCGv tmp;
TCGv tmp2;
tmp2 = load_reg(s, UCOP_REG_N);
i = (IS_USER(s) || (!UCOP_SET_P && UCOP_SET_W));
mmu_idx = (IS_USER(s) || (!UCOP_SET_P && UCOP_SET_W));
/* immediate */
if (UCOP_SET_P) {
@ -1569,17 +1576,17 @@ static void do_ldst_ir(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
if (UCOP_SET_L) {
/* load */
if (UCOP_SET_B) {
tmp = gen_ld8u(tmp2, i);
tmp = gen_ld8u(tmp2, mmu_idx);
} else {
tmp = gen_ld32(tmp2, i);
tmp = gen_ld32(tmp2, mmu_idx);
}
} else {
/* store */
tmp = load_reg(s, UCOP_REG_D);
if (UCOP_SET_B) {
gen_st8(tmp, tmp2, i);
gen_st8(tmp, tmp2, mmu_idx);
} else {
gen_st32(tmp, tmp2, i);
gen_st32(tmp, tmp2, mmu_idx);
}
}
if (!UCOP_SET_P) {
@ -1682,7 +1689,7 @@ static void do_ldst_hwsb(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
/* load/store multiple words */
static void do_ldst_m(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
{
unsigned int val, i;
unsigned int val, i, mmu_idx;
int j, n, reg, user, loaded_base;
TCGv tmp;
TCGv tmp2;
@ -1703,6 +1710,7 @@ static void do_ldst_m(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
}
}
mmu_idx = (IS_USER(s) || (!UCOP_SET_P && UCOP_SET_W));
addr = load_reg(s, UCOP_REG_N);
/* compute total size */
@ -1747,7 +1755,7 @@ static void do_ldst_m(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
}
if (UCOP_SET(i)) {
if (UCOP_SET_L) { /* load */
tmp = gen_ld32(addr, IS_USER(s));
tmp = gen_ld32(addr, mmu_idx);
if (reg == 31) {
gen_bx(s, tmp);
} else if (user) {
@ -1775,7 +1783,7 @@ static void do_ldst_m(CPUUniCore32State *env, DisasContext *s, uint32_t insn)
} else {
tmp = load_reg(s, reg);
}
gen_st32(tmp, addr, IS_USER(s));
gen_st32(tmp, addr, mmu_idx);
}
j++;
/* no need to add after the last transfer */
@ -1964,6 +1972,14 @@ static inline void gen_intermediate_code_internal(CPUUniCore32State *env,
max_insns = CF_COUNT_MASK;
}
#ifndef CONFIG_USER_ONLY
if ((env->uncached_asr & ASR_M) == ASR_MODE_USER) {
dc->user = 1;
} else {
dc->user = 0;
}
#endif
gen_icount_start();
do {
if (unlikely(!QTAILQ_EMPTY(&env->breakpoints))) {