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target/arm: Add v8M stack checks for Thumb push/pop 

Add v8M stack checks for the 16-bit Thumb push/pop
encodings: STMDB, STMFD, LDM, LDMIA, LDMFD.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181002163556.10279-12-peter.maydell@linaro.org
master
Peter Maydell 2018-10-08 14:55:05 +01:00
parent 0bc003bad9
commit aa369e5c08
1 changed files with 15 additions and 1 deletions
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16
target/arm/translate.c
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@ -12251,7 +12251,10 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
store_reg(s, rd, tmp);
break;
case 4: case 5: case 0xc: case 0xd:
/* push/pop */
/*
* 0b1011_x10x_xxxx_xxxx
* - push/pop
*/
addr = load_reg(s, 13);
if (insn & (1 << 8))
offset = 4;
@ -12264,6 +12267,17 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
if ((insn & (1 << 11)) == 0) {
tcg_gen_addi_i32(addr, addr, -offset);
}
if (s->v8m_stackcheck) {
/*
* Here 'addr' is the lower of "old SP" and "new SP";
* if this is a pop that starts below the limit and ends
* above it, it is UNKNOWN whether the limit check triggers;
* we choose to trigger.
*/
gen_helper_v8m_stackcheck(cpu_env, addr);
}
for (i = 0; i < 8; i++) {
if (insn & (1 << i)) {
if (insn & (1 << 11)) {