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
92 lines
2.2 KiB
ArmAsm
92 lines
2.2 KiB
ArmAsm
#include <minix/ipcconst.h>
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#include <machine/asm.h>
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SRC_DST = 8 /* source/ destination process */
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MESSAGE = 12 /* message pointer */
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STATUS = 16 /* status pointer */
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/**========================================================================* */
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/* IPC assembly routines * */
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/**========================================================================* */
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/* all message passing routines save ebx, but destroy eax and ecx. */
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ENTRY(_send_orig)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl SRC_DST(%ebp), %eax /* eax = dest-src */
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movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
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movl $SEND, %ecx /* _send(dest, ptr) */
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int $IPCVEC_ORIG /* trap to the kernel */
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pop %ebx
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pop %ebp
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ret
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ENTRY(_receive_orig)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl SRC_DST(%ebp), %eax /* eax = dest-src */
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movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
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movl $RECEIVE, %ecx /* _receive(src, ptr) */
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int $IPCVEC_ORIG /* trap to the kernel */
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movl STATUS(%ebp), %ecx /* ecx = status pointer */
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movl %ebx, (%ecx)
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pop %ebx
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pop %ebp
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ret
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ENTRY(_sendrec_orig)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl SRC_DST(%ebp), %eax /* eax = dest-src */
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movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
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movl $SENDREC, %ecx /* _sendrec(srcdest, ptr) */
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int $IPCVEC_ORIG /* trap to the kernel */
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pop %ebx
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pop %ebp
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ret
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ENTRY(_minix_kernel_info_struct)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl $0, %eax
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movl $0, %ebx
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movl $MINIX_KERNINFO, %ecx
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int $IPCVEC_ORIG /* trap to the kernel */
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movl 8(%ebp), %ecx /* ecx = return struct ptr */
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movl %ebx, (%ecx)
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pop %ebx
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pop %ebp
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ret
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ENTRY(_notify_orig)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl SRC_DST(%ebp), %eax /* eax = destination */
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movl $NOTIFY, %ecx /* _notify(srcdst) */
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int $IPCVEC_ORIG /* trap to the kernel */
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pop %ebx
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pop %ebp
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ret
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ENTRY(_sendnb_orig)
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push %ebp
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movl %esp, %ebp
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push %ebx
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movl SRC_DST(%ebp), %eax /* eax = dest-src */
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movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
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movl $SENDNB, %ecx /* _sendnb(dest, ptr) */
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int $IPCVEC_ORIG /* trap to the kernel */
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pop %ebx
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pop %ebp
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ret
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ENTRY(_do_kernel_call_orig)
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/* pass the message pointer to kernel in the %eax register */
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movl 4(%esp), %eax
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int $KERVEC_ORIG
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ret
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