198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* The system call that is implemented in this file:
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* m_type: SYS_SIGRETURN
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*
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* The parameters for this system call are:
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* m2_i1: SIG_PROC # process returning from handler
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* m2_p1: SIG_CTXT_PTR # pointer to sigcontext structure
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*
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*/
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#include "../system.h"
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#include <signal.h>
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#include <sys/sigcontext.h>
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#if USE_SIGRETURN
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/*===========================================================================*
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* do_sigreturn *
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*===========================================================================*/
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PUBLIC int do_sigreturn(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* POSIX style signals require sys_sigreturn to put things in order before
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* the signalled process can resume execution
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*/
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struct sigcontext sc;
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register struct proc *rp;
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phys_bytes src_phys;
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rp = proc_addr(m_ptr->SIG_PROC);
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/* Copy in the sigcontext structure. */
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src_phys = umap_local(rp, D, (vir_bytes) m_ptr->SIG_CTXT_PTR,
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(vir_bytes) sizeof(struct sigcontext));
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if (src_phys == 0) return(EFAULT);
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phys_copy(src_phys, vir2phys(&sc), (phys_bytes) sizeof(struct sigcontext));
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/* Make sure that this is not just a jump buffer. */
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if ((sc.sc_flags & SC_SIGCONTEXT) == 0) return(EINVAL);
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/* Fix up only certain key registers if the compiler doesn't use
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* register variables within functions containing setjmp.
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*/
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if (sc.sc_flags & SC_NOREGLOCALS) {
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rp->p_reg.retreg = sc.sc_retreg;
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rp->p_reg.fp = sc.sc_fp;
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rp->p_reg.pc = sc.sc_pc;
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rp->p_reg.sp = sc.sc_sp;
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return(OK);
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}
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sc.sc_psw = rp->p_reg.psw;
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#if (CHIP == INTEL)
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/* Don't panic kernel if user gave bad selectors. */
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sc.sc_cs = rp->p_reg.cs;
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sc.sc_ds = rp->p_reg.ds;
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sc.sc_es = rp->p_reg.es;
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#if _WORD_SIZE == 4
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sc.sc_fs = rp->p_reg.fs;
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sc.sc_gs = rp->p_reg.gs;
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#endif
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#endif
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/* Restore the registers. */
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kmemcpy(&rp->p_reg, (char *)&sc.sc_regs, sizeof(struct sigregs));
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return(OK);
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}
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#endif /* USE_SIGRETURN */
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