Remove building with NOCRYPTO option
[minix.git] / minix / kernel / system / do_sigreturn.c
blob061c23562e8ee057c6cbc34086df350289385c65
1 /* The kernel call that is implemented in this file:
2 * m_type: SYS_SIGRETURN
4 * The parameters for this kernel call are:
5 * m_sigcalls.endp # process returning from handler
6 * m_sigcalls.sigctx # pointer to sigcontext structure
8 */
10 #include "kernel/system.h"
11 #include <string.h>
12 #include <machine/cpu.h>
14 #if USE_SIGRETURN
16 /*===========================================================================*
17 * do_sigreturn *
18 *===========================================================================*/
19 int do_sigreturn(struct proc * caller, message * m_ptr)
21 /* POSIX style signals require sys_sigreturn to put things in order before
22 * the signalled process can resume execution
24 struct sigcontext sc;
25 register struct proc *rp;
26 int proc_nr, r;
28 if (!isokendpt(m_ptr->m_sigcalls.endpt, &proc_nr)) return EINVAL;
29 if (iskerneln(proc_nr)) return EPERM;
30 rp = proc_addr(proc_nr);
32 /* Copy in the sigcontext structure. */
33 if ((r = data_copy(m_ptr->m_sigcalls.endpt,
34 (vir_bytes)m_ptr->m_sigcalls.sigctx, KERNEL,
35 (vir_bytes)&sc, sizeof(struct sigcontext))) != OK)
36 return r;
38 #if defined(__i386__)
39 /* Restore user bits of psw from sc, maintain system bits from proc. */
40 sc.sc_eflags = (sc.sc_eflags & X86_FLAGS_USER) |
41 (rp->p_reg.psw & ~X86_FLAGS_USER);
42 #endif
44 #if defined(__i386__)
45 /* Write back registers we allow to be restored, i.e.
46 * not the segment ones.
48 rp->p_reg.di = sc.sc_edi;
49 rp->p_reg.si = sc.sc_esi;
50 rp->p_reg.fp = sc.sc_ebp;
51 rp->p_reg.bx = sc.sc_ebx;
52 rp->p_reg.dx = sc.sc_edx;
53 rp->p_reg.cx = sc.sc_ecx;
54 rp->p_reg.retreg = sc.sc_eax;
55 rp->p_reg.pc = sc.sc_eip;
56 rp->p_reg.psw = sc.sc_eflags;
57 rp->p_reg.sp = sc.sc_esp;
58 #endif
60 #if defined(__arm__)
61 rp->p_reg.psr = sc.sc_spsr;
62 rp->p_reg.retreg = sc.sc_r0;
63 rp->p_reg.r1 = sc.sc_r1;
64 rp->p_reg.r2 = sc.sc_r2;
65 rp->p_reg.r3 = sc.sc_r3;
66 rp->p_reg.r4 = sc.sc_r4;
67 rp->p_reg.r5 = sc.sc_r5;
68 rp->p_reg.r6 = sc.sc_r6;
69 rp->p_reg.r7 = sc.sc_r7;
70 rp->p_reg.r8 = sc.sc_r8;
71 rp->p_reg.r9 = sc.sc_r9;
72 rp->p_reg.r10 = sc.sc_r10;
73 rp->p_reg.fp = sc.sc_r11;
74 rp->p_reg.r12 = sc.sc_r12;
75 rp->p_reg.sp = sc.sc_usr_sp;
76 rp->p_reg.lr = sc.sc_usr_lr;
77 rp->p_reg.pc = sc.sc_pc;
78 #endif
80 /* Restore the registers. */
81 arch_proc_setcontext(rp, &rp->p_reg, 1, sc.trap_style);
83 if(sc.sc_magic != SC_MAGIC) { printf("kernel sigreturn: corrupt signal context\n"); }
85 #if defined(__i386__)
86 if (sc.sc_flags & MF_FPU_INITIALIZED)
88 memcpy(rp->p_seg.fpu_state, &sc.sc_fpu_state, FPU_XFP_SIZE);
89 rp->p_misc_flags |= MF_FPU_INITIALIZED; /* Restore math usage flag. */
90 /* force reloading FPU */
91 release_fpu(rp);
93 #endif
95 return OK;
97 #endif /* USE_SIGRETURN */