diff options
author | dzwdz | 2021-07-21 21:35:20 +0200 |
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committer | dzwdz | 2021-07-21 21:35:20 +0200 |
commit | 8a168f2be5d90f972975abf0b40145a75c0231b7 (patch) | |
tree | cdfcd84a132a6a9864b01b626cc670e9caf7c4ef /src/kernel/syscalls.c | |
parent | 36089d20ca1f7c57f36c4172759a5084bdf87a3a (diff) |
syscall parameter & return value passing
Sadly, sysenter on i386 limits me to only 4 arguments (so, 1 for the
syscall id + 3 real args). If that turns out to be an issue I'll either
just switch to interrupts, or switch to x64.
Diffstat (limited to 'src/kernel/syscalls.c')
-rw-r--r-- | src/kernel/syscalls.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c index 25b8eb5..a42dc44 100644 --- a/src/kernel/syscalls.c +++ b/src/kernel/syscalls.c @@ -1,6 +1,15 @@ #include <kernel/arch/generic.h> #include <kernel/panic.h> -void syscall_handler() { +int syscall_handler(int a, int b, int c, int d) { + // verify that the parameters get passed correctly + if (a != 1) panic(); + if (b != 2) panic(); + if (c != 3) panic(); + if (d != 4) panic(); + log_const("in a syscall!"); + + // used to check if the return value gets passed correctly + return 0x4e; } |