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
26 lines
496 B
C
26 lines
496 B
C
#include <sys/cdefs.h>
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#include <lib.h>
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#include "namespace.h"
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#ifdef __weak_alias
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__weak_alias(syscall, _syscall)
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#endif
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int _syscall(endpoint_t who, int syscallnr, 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) {
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/* 'sendrec' itself failed. */
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/* XXX - strerror doesn't know all the codes */
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msgptr->m_type = status;
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}
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if (msgptr->m_type < 0) {
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errno = -msgptr->m_type;
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return(-1);
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}
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return(msgptr->m_type);
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}
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