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linux-user: Add x86_64 vsyscall page to /proc/self/maps 

The page isn't (necessarily) present in the host /proc/self/maps,
and even if it might be it isn't present in page_flags, and even
if it was it might not have the same set of page permissions.

The easiest thing to do, particularly when it comes to the
"[vsyscall]" note at the end of line, is to special case it.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200213032223.14643-5-richard.henderson@linaro.org>
[lv: remove trailing space]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2020-02-12 19:22:22 -08:00 committed by Laurent Vivier
parent b26491b4d4
commit bf02adcd88
1 changed files with 10 additions and 0 deletions
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10
linux-user/syscall.c
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@ -7144,6 +7144,16 @@ static int open_self_maps(void *cpu_env, int fd)
}
}
#ifdef TARGET_VSYSCALL_PAGE
/*
* We only support execution from the vsyscall page.
* This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
*/
dprintf(fd, TARGET_FMT_lx "-" TARGET_FMT_lx
" --xp 00000000 00:00 0 [vsyscall]\n",
TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE);
#endif
free(line);
fclose(fp);