2d72cbec41
. add cpufeature detection of both . use it for both ipc and kernelcall traps, using a register for call number . SYSENTER/SYSCALL does not save any context, therefore userland has to save it . to accomodate multiple kernel entry/exit types, the entry type is recorded in the process struct. hitherto all types were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL is new, with the difference that context is not fully restored from proc struct when running the process again. this can't be done as some information is missing. . complication: cases in which the kernel has to fully change process context (i.e. sigreturn). in that case the exit type is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and context is fully restored from the proc struct. this does mean the PC and SP must change, as the sysenter/sysexit userland code will otherwise try to restore its own context. this is true in the sigreturn case. . override all usage by setting libc_ipc=1
21 lines
444 B
C
21 lines
444 B
C
/* _taskcall() is the same as _syscall() except it returns negative error
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* codes directly and not in errno. This is a better interface for PM and
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* VFS.
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*/
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#include <lib.h>
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#include <minix/syslib.h>
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int _taskcall(who, syscallnr, msgptr)
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endpoint_t who;
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int syscallnr;
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register message *msgptr;
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{
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int status;
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msgptr->m_type = syscallnr;
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status = sendrec(who, msgptr);
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if (status != 0) return(status);
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return(msgptr->m_type);
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}
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