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

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

Backports commit aa369e5c08bbe2748d2be96f13f4ef469a4d3080 from qemu
This commit is contained in:
Peter Maydell 2018-10-08 14:22:07 -04:00 committed by Lioncash
parent ef9afb1855
commit 37d0c7fcf1
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 15 additions and 1 deletions
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16
qemu/target/arm/translate.c
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@ -12466,7 +12466,10 @@ 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;
@ -12479,6 +12482,17 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
if ((insn & (1 << 11)) == 0) {
tcg_gen_addi_i32(tcg_ctx, 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(tcg_ctx, tcg_ctx->cpu_env, addr);
}
for (i = 0; i < 8; i++) {
if (insn & (1 << i)) {
if (insn & (1 << 11)) {