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target-arm: fix SRS/RFE instructions 

The encoding of 'IA' and 'DB' conditions was swapped.
SRS instruction must store banked SPSR instead of CPSR at the specific address.
Missing 'return' statement at the end of RFE handling.
Fixed write-back code to reference correct registers.

From: Hyeonsung Jang <hsjang@ok-labs.com>
Signed-off-by: Filip Navara <filip.navara@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Filip Navara 2009-10-15 12:12:11 +02:00 committed by Aurelien Jarno
parent 217aff9c76
commit c67b6b719b
1 changed files with 16 additions and 15 deletions
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31
target-arm/translate.c
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@ -5749,7 +5749,7 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
}
} else if ((insn & 0x0e5fffe0) == 0x084d0500) {
/* srs */
uint32_t offset;
int32_t offset;
if (IS_USER(s))
goto illegal_op;
ARCH(6);
@ -5763,8 +5763,8 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
i = (insn >> 23) & 3;
switch (i) {
case 0: offset = -4; break; /* DA */
case 1: offset = -8; break; /* DB */
case 2: offset = 0; break; /* IA */
case 1: offset = 0; break; /* IA */
case 2: offset = -8; break; /* DB */
case 3: offset = 4; break; /* IB */
default: abort();
}
@ -5772,32 +5772,32 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
tcg_gen_addi_i32(addr, addr, offset);
tmp = load_reg(s, 14);
gen_st32(tmp, addr, 0);
tmp = new_tmp();
gen_helper_cpsr_read(tmp);
tmp = load_cpu_field(spsr);
tcg_gen_addi_i32(addr, addr, 4);
gen_st32(tmp, addr, 0);
if (insn & (1 << 21)) {
/* Base writeback. */
switch (i) {
case 0: offset = -8; break;
case 1: offset = -4; break;
case 2: offset = 4; break;
case 1: offset = 4; break;
case 2: offset = -4; break;
case 3: offset = 0; break;
default: abort();
}
if (offset)
tcg_gen_addi_i32(addr, tmp, offset);
tcg_gen_addi_i32(addr, addr, offset);
if (op1 == (env->uncached_cpsr & CPSR_M)) {
gen_movl_reg_T1(s, 13);
store_reg(s, 13, addr);
} else {
gen_helper_set_r13_banked(cpu_env, tcg_const_i32(op1), cpu_T[1]);
gen_helper_set_r13_banked(cpu_env, tcg_const_i32(op1), addr);
dead_tmp(addr);
}
} else {
dead_tmp(addr);
}
} else if ((insn & 0x0e5fffe0) == 0x081d0a00) {
/* rfe */
uint32_t offset;
int32_t offset;
if (IS_USER(s))
goto illegal_op;
ARCH(6);
@ -5806,8 +5806,8 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
i = (insn >> 23) & 3;
switch (i) {
case 0: offset = -4; break; /* DA */
case 1: offset = -8; break; /* DB */
case 2: offset = 0; break; /* IA */
case 1: offset = 0; break; /* IA */
case 2: offset = -8; break; /* DB */
case 3: offset = 4; break; /* IB */
default: abort();
}
@ -5821,8 +5821,8 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
/* Base writeback. */
switch (i) {
case 0: offset = -8; break;
case 1: offset = -4; break;
case 2: offset = 4; break;
case 1: offset = 4; break;
case 2: offset = -4; break;
case 3: offset = 0; break;
default: abort();
}
@ -5833,6 +5833,7 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
dead_tmp(addr);
}
gen_rfe(s, tmp, tmp2);
return;
} else if ((insn & 0x0e000000) == 0x0a000000) {
/* branch link and change to thumb (blx <offset>) */
int32_t offset;