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
30 lines
819 B
C
30 lines
819 B
C
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#include <stdio.h>
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#include <minix/ipc.h>
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/* Minix kernel info, IPC functions pointers */
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struct minix_kerninfo *_minix_kerninfo = NULL;
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void __minix_init(void) __attribute__((__constructor__, __used__));
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struct minix_ipcvecs _minix_ipcvecs = {
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.sendrec_ptr = _sendrec_orig,
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.send_ptr = _send_orig,
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.notify_ptr = _notify_orig,
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.senda_ptr = _senda_orig,
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.sendnb_ptr = _sendnb_orig,
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.receive_ptr = _receive_orig,
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.do_kernel_call_ptr = _do_kernel_call_orig,
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};
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void __minix_init(void)
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{
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if((_minix_kernel_info_struct(&_minix_kerninfo)) != 0
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|| _minix_kerninfo->kerninfo_magic != KERNINFO_MAGIC) {
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_minix_kerninfo = NULL;
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} else if((_minix_kerninfo->ki_flags & MINIX_KIF_IPCVECS) &&
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_minix_kerninfo->minix_ipcvecs) {
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_minix_ipcvecs = *_minix_kerninfo->minix_ipcvecs;
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}
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}
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