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linux-user: Use correct target SHMLBA in shmat()

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The shmat() handling needs to do target-specific handling
of the attach address for shmat():
 * if the SHM_RND flag is passed, the address is rounded
   down to a SHMLBA boundary
 * if SHM_RND is not passed, then the call is failed EINVAL
   if the address is not a multiple of SHMLBA

Since SHMLBA is target-specific, we need to do this
checking and rounding in QEMU and can't leave it up to the
host syscall.

Allow targets to define TARGET_FORCE_SHMLBA and provide
a target_shmlba() function if appropriate, and update
do_shmat() to honour them.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-07-11 16:48:11 +01:00 • committed by Riku Voipio
parent 0ef9ea290e
commit ee8e76141b
6 changed files with 83 additions and 6 deletions
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16
linux-user/sparc/target_syscall.h
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@ -22,4 +22,20 @@ struct target_pt_regs {
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
/* For SPARC SHMLBA is determined at runtime in the kernel, and
* libc has to runtime-detect it using the hwcaps (see glibc
* sysdeps/unix/sysv/linux/sparc/getshmlba; we follow the same
* logic here, though we know we're not the sparc v9 64-bit case).
*/
#define TARGET_FORCE_SHMLBA
static inline abi_ulong target_shmlba(CPUSPARCState *env)
{
if (!(env->def->features & CPU_FEATURE_FLUSH)) {
return 64 * 1024;
} else {
return 256 * 1024;
}
}
#endif /* SPARC_TARGET_SYSCALL_H */