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bsd-user: define max args in terms of pages 

For 32-bit platforms, pass in up to 256k of args. For 64-bit, bump that
to 512k.

Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2021-08-04 00:19:23 -06:00 committed by Warner Losh
parent ab77bd844b
commit e5e4426306
1 changed files with 11 additions and 4 deletions
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15
bsd-user/qemu.h
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@ -20,6 +20,7 @@
#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/units.h"
#include "exec/cpu_ldst.h"
#include "exec/exec-all.h"
@ -101,11 +102,17 @@ extern const char *qemu_uname_release;
extern unsigned long mmap_min_addr;
/*
* MAX_ARG_PAGES defines the number of pages allocated for arguments
* and envelope for the new program. 32 should suffice, this gives
* a maximum env+arg of 128kB w/4KB pages!
* TARGET_ARG_MAX defines the number of bytes allocated for arguments
* and envelope for the new program. 256k should suffice for a reasonable
* maxiumum env+arg in 32-bit environments, bump it up to 512k for !ILP32
* platforms.
*/
#define MAX_ARG_PAGES 32
#if TARGET_ABI_BITS > 32
#define TARGET_ARG_MAX (512 * KiB)
#else
#define TARGET_ARG_MAX (256 * KiB)
#endif
#define MAX_ARG_PAGES (TARGET_ARG_MAX / TARGET_PAGE_SIZE)
/*
* This structure is used to hold the arguments that are