diff options
| author | Shawn Nematbakhsh <shawnn@chromium.org> | 2016-11-17 12:56:13 -0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2016-11-18 20:07:08 -0800 |
| commit | e97073a20dd489ad8c7e90cb2ca04bc9a05463f8 (patch) | |
| tree | e37945083261c13736f26d061da3a694b6f948d5 /chip/lm4 | |
| parent | 7c6d8d40f135676f4a695a0a4ff3ca7ef926450a (diff) | |
| download | chrome-ec-e97073a20dd489ad8c7e90cb2ca04bc9a05463f8.tar.gz | |
clock: Fix clock_wait_cycles() asm
The 'cycles' register will be clobbered by our macro, so it must be
specified as an output operand that may also be used as input.
BUG=chrome-os-partner:60000
BRANCH=gru,strago,glados
TEST=Build + burn wheatley, verify alignment exception is not
encountered on boot. Also verify produced assembly is still correct:
100a89a6: 2303 movs r3, #3
100a89a8: 3b01 subs r3, #1
100a89aa: d1fd bne.n 100a89a8
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Change-Id: I1be03a006967aed6970dbac5d98a19a31e0b7d49
Reviewed-on: https://chromium-review.googlesource.com/412441
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Mulin Chao <mlchao@nuvoton.com>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Mulin Chao <mlchao@nuvoton.com>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Diffstat (limited to 'chip/lm4')
| -rw-r--r-- | chip/lm4/clock.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/chip/lm4/clock.c b/chip/lm4/clock.c index bc4b865403..99c83422f7 100644 --- a/chip/lm4/clock.c +++ b/chip/lm4/clock.c @@ -140,8 +140,8 @@ void clock_enable_pll(int enable, int notify) void clock_wait_cycles(uint32_t cycles) { - asm("1: subs %0, #1\n" - " bne 1b\n" :: "r"(cycles)); + asm volatile("1: subs %0, #1\n" + " bne 1b\n" : "+r"(cycles)); } int clock_get_freq(void) |