diff options
| author | Michael Davidsaver <mdavidsaver@gmail.com> | 2017-01-27 15:20:23 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-01-27 15:29:08 +0000 |
| commit | dc858c6633a9af8b80c1509cf6f825e4390d3ad1 (patch) | |
| tree | aa72baa92945160a912bab49b2cecb8b4c06a4b7 | |
| parent | e6b332097d1a4713173a82f17d039b4c78bc6f59 (diff) | |
armv7m: honour CCR.STACKALIGN on exception entry
The CCR.STACKALIGN bit controls whether the CPU is supposed to force
8-alignment of the stack pointer on entry to the exception handler.
Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
Message-id: 1485285380-10565-6-git-send-email-peter.maydell@linaro.org
[PMM: commit message and comment tweaks]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | target/arm/helper.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index ce7e43bbac..7dc30f5769 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -6110,10 +6110,8 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs) return; /* Never happens. Keep compiler happy. */ } - /* Align stack pointer. */ - /* ??? Should only do this if Configuration Control Register - STACKALIGN bit is set. */ - if (env->regs[13] & 4) { + /* Align stack pointer if the guest wants that */ + if ((env->regs[13] & 4) && (env->v7m.ccr & R_V7M_CCR_STKALIGN_MASK)) { env->regs[13] -= 4; xpsr |= 0x200; } |