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| author | Luke Shumaker <lukeshu@parabola.nu> | 2017-12-28 13:08:11 -0500 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2018-03-13 15:02:20 +0100 |
| commit | aac362e46f13305fd9b4abfe7d0068595d4555f2 (patch) | |
| tree | b5e4b027ccc5c8cb1f03ac6fc9983d0dc07ee79b /linux-user | |
| parent | 7ad75eea86e5e9a327a1f64a3e8ec6dbb6534d1e (diff) | |
| download | qemu-aac362e46f13305fd9b4abfe7d0068595d4555f2.zip qemu-aac362e46f13305fd9b4abfe7d0068595d4555f2.tar.gz qemu-aac362e46f13305fd9b4abfe7d0068595d4555f2.tar.bz2 | |
linux-user: init_guest_space: Don't try to align if we'll reject it
If the ensure-alignment code gets triggered, then the
"if (host_start && real_start != current_start)" check will always trigger,
so save 2 syscalls and put that check first.
Note that we can't just switch to using MAP_FIXED for that check, because
then we couldn't differentiate between a failure because "there isn't
enough space" and "there isn't enough space *here*".
Signed-off-by: Luke Shumaker <lukeshu@parabola.nu>
Message-Id: <20171228180814.9749-9-lukeshu@lukeshu.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/elfload.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/linux-user/elfload.c b/linux-user/elfload.c index c6491a8..5c64299 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1845,6 +1845,11 @@ unsigned long init_guest_space(unsigned long host_start, return (unsigned long)-1; } + /* Check to see if the address is valid. */ + if (host_start && real_start != current_start) { + goto try_again; + } + /* Ensure the address is properly aligned. */ if (real_start & ~qemu_host_page_mask) { /* Ideally, we adjust like @@ -1879,11 +1884,6 @@ unsigned long init_guest_space(unsigned long host_start, aligned_start = real_start; } - /* Check to see if the address is valid. */ - if (host_start && aligned_start != current_start) { - goto try_again; - } - #if defined(TARGET_ARM) && !defined(TARGET_AARCH64) /* On 32-bit ARM, we need to also be able to map the commpage. */ int valid = init_guest_commpage(aligned_start - guest_start, |