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
18 lines
398 B
ArmAsm
18 lines
398 B
ArmAsm
#include <minix/ipcconst.h>
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#include <machine/asm.h>
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MSGTAB = 8 /* message table */
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TABCOUNT = 12 /* number of entries in message table */
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ENTRY(_senda_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 TABCOUNT(%ebp), %eax /* eax = count */
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movl MSGTAB(%ebp), %ebx /* ebx = table */
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movl $SENDA, %ecx /* _senda(table, count) */
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int $IPCVEC /* 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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