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linux-user: Tidy and enforce reserved_va initialization

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We had a check using TARGET_VIRT_ADDR_SPACE_BITS to make sure
that the allocation coming in from the command-line option was
not too large, but that didn't include target-specific knowledge
about other restrictions on user-space.

Remove several target-specific hacks in linux-user/main.c.

For MIPS and Nios, we can replace them with proper adjustments
to the respective target's TARGET_VIRT_ADDR_SPACE_BITS definition.

For ARM, we had no existing ifdef but I suspect that the current
default value of 0xf7000000 was chosen with this in mind.  Define
a workable value in linux-user/arm/, and also document why the
special case is required.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20170708025030.15845-3-rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Richard Henderson 2017-10-05 10:36:00 -04:00 • committed by Riku Voipio
parent de258eb07d
commit 18e80c55bb
4 changed files with 39 additions and 15 deletions
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6
target/mips/mips-defs.h
View file

@ -15,7 +15,11 @@
#else
#define TARGET_LONG_BITS 32
#define TARGET_PHYS_ADDR_SPACE_BITS 40
#define TARGET_VIRT_ADDR_SPACE_BITS 32
# ifdef CONFIG_USER_ONLY
# define TARGET_VIRT_ADDR_SPACE_BITS 31
# else
# define TARGET_VIRT_ADDR_SPACE_BITS 32
#endif
#endif
/* Masks used to mark instructions to indicate which ISA level they