7597f4a8fc
. use netbsd sigframe, sigcontext struct . netbsd sigframe *contains* sigcontext; use that directly in kernel sigsend . drop two fields from minix x86 stackframe.h (process context) that were unused, retadr and st use in-sigframe sigcontext Change-Id: Ib59d699596dc3a78163dee59f19730482fdddf11
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/* The kernel 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 kernel call are:
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* m_sigcalls.endp # process returning from handler
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* m_sigcalls.sigctx # pointer to sigcontext structure
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*
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*/
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#include "kernel/system.h"
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#include <string.h>
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#include <machine/cpu.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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int do_sigreturn(struct proc * caller, message * m_ptr)
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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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int proc_nr, r;
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if (!isokendpt(m_ptr->m_sigcalls.endpt, &proc_nr)) return EINVAL;
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if (iskerneln(proc_nr)) return EPERM;
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rp = proc_addr(proc_nr);
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/* Copy in the sigcontext structure. */
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if ((r = data_copy(m_ptr->m_sigcalls.endpt,
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(vir_bytes)m_ptr->m_sigcalls.sigctx, KERNEL,
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(vir_bytes)&sc, sizeof(struct sigcontext))) != OK)
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return r;
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#if defined(__i386__)
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/* Restore user bits of psw from sc, maintain system bits from proc. */
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sc.sc_eflags = (sc.sc_eflags & X86_FLAGS_USER) |
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(rp->p_reg.psw & ~X86_FLAGS_USER);
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#endif
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#if defined(__i386__)
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/* Write back registers we allow to be restored, i.e.
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* not the segment ones.
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*/
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rp->p_reg.di = sc.sc_edi;
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rp->p_reg.si = sc.sc_esi;
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rp->p_reg.fp = sc.sc_ebp;
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rp->p_reg.bx = sc.sc_ebx;
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rp->p_reg.dx = sc.sc_edx;
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rp->p_reg.cx = sc.sc_ecx;
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rp->p_reg.retreg = sc.sc_eax;
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rp->p_reg.pc = sc.sc_eip;
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rp->p_reg.psw = sc.sc_eflags;
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rp->p_reg.sp = sc.sc_esp;
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#endif
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#if defined(__arm__)
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rp->p_reg.psr = sc.sc_spsr;
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rp->p_reg.retreg = sc.sc_r0;
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rp->p_reg.r1 = sc.sc_r1;
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rp->p_reg.r2 = sc.sc_r2;
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rp->p_reg.r3 = sc.sc_r3;
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rp->p_reg.r4 = sc.sc_r4;
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rp->p_reg.r5 = sc.sc_r5;
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rp->p_reg.r6 = sc.sc_r6;
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rp->p_reg.r7 = sc.sc_r7;
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rp->p_reg.r8 = sc.sc_r8;
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rp->p_reg.r9 = sc.sc_r9;
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rp->p_reg.r10 = sc.sc_r10;
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rp->p_reg.fp = sc.sc_r11;
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rp->p_reg.r12 = sc.sc_r12;
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rp->p_reg.sp = sc.sc_usr_sp;
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rp->p_reg.lr = sc.sc_usr_lr;
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rp->p_reg.pc = sc.sc_pc;
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#endif
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/* Restore the registers. */
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arch_proc_setcontext(rp, &rp->p_reg, 1, sc.trap_style);
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if(sc.sc_magic != SC_MAGIC) { printf("kernel sigreturn: corrupt signal context\n"); }
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#if defined(__i386__)
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if (sc.sc_flags & MF_FPU_INITIALIZED)
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{
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memcpy(rp->p_seg.fpu_state, &sc.sc_fpu_state, FPU_XFP_SIZE);
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rp->p_misc_flags |= MF_FPU_INITIALIZED; /* Restore math usage flag. */
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/* force reloading FPU */
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release_fpu(rp);
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}
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#endif
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return OK;
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}
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#endif /* USE_SIGRETURN */
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