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kernel: allow up to 6 arguments for system calls

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A quick look at "man syscall" shows that in Linux, all architectures
support at least 6 argument system calls, with a few supporting 7. We
can at least do 6 in Zephyr.

x86 port modified to use EBP register to carry the 6th system call
argument.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-09-19 09:59:42 -07:00 • committed by Andrew Boie
commit 1956f09590
5 changed files with 43 additions and 14 deletions
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4
include/kernel.h
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@ -3917,6 +3917,10 @@ static inline int _is_user_context(void)
}
/* Interfaces for invoking system calls */
static inline u32_t _arch_syscall_invoke6(u32_t arg1, u32_t arg2, u32_t arg3,
u32_t arg4, u32_t arg5, u32_t arg6,
u32_t call_id);
static inline u32_t _arch_syscall_invoke5(u32_t arg1, u32_t arg2, u32_t arg3,
u32_t arg4, u32_t arg5,
u32_t call_id);