From aa369e5c08bbe2748d2be96f13f4ef469a4d3080 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 8 Oct 2018 14:55:05 +0100 Subject: [PATCH] target/arm: Add v8M stack checks for Thumb push/pop MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add v8M stack checks for the 16-bit Thumb push/pop encodings: STMDB, STMFD, LDM, LDMIA, LDMFD. Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Richard Henderson Message-id: 20181002163556.10279-12-peter.maydell@linaro.org --- target/arm/translate.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/target/arm/translate.c b/target/arm/translate.c index 65df8d6975..ef64d2559d 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -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)) {