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/* $NetBSD: mcontext.h,v 1.24 2020/10/03 09:56:00 martin Exp $ */
/*-
* Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MIPS_MCONTEXT_H_
#define _MIPS_MCONTEXT_H_
/*
* General register state
*/
#define _NGREG 37 /* R0-R31, MDLO, MDHI, CAUSE, PC, SR */
#define _REG_R0 0
#define _REG_AT 1
#define _REG_V0 2
#define _REG_V1 3
#define _REG_A0 4
#define _REG_A1 5
#define _REG_A2 6
#define _REG_A3 7
#define _REG_T0 8
#define _REG_T1 9
#define _REG_T2 10
#define _REG_T3 11
#define _REG_T4 12
#define _REG_T5 13
#define _REG_T6 14
#define _REG_T7 15
#define _REG_S0 16
#define _REG_S1 17
#define _REG_S2 18
#define _REG_S3 19
#define _REG_S4 20
#define _REG_S5 21
#define _REG_S6 22
#define _REG_S7 23
#define _REG_T8 24
#define _REG_T9 25
#define _REG_K0 26
#define _REG_K1 27
#define _REG_GP 28
#define _REG_SP 29
#define _REG_S8 30
#define _REG_RA 31
/* XXX: The following conflict with <mips/regnum.h> */
#define _REG_MDLO 32
#define _REG_MDHI 33
#define _REG_CAUSE 34
#define _REG_EPC 35
#define _REG_SR 36
#ifndef __ASSEMBLER__
/* Make sure this is signed; we need pointers to be sign-extended. */
#if defined(__mips_n32)
typedef long long __greg_t;
#else
typedef long __greg_t;
#endif /* __mips_n32 */
typedef __greg_t __gregset_t[_NGREG];
/*
* For the O32/O64 ABI, there are 16 doubles, one at each even FP reg
* number. The FP registers themselves are 32-bits.
*
* For 64-bit ABIs (include N32), each FP register is a 64-bit double.
*/
typedef __greg_t __freg_t;
/*
* Floating point register state
*/
struct __fpregset_nabi {
union {
double __fp64_dregs[32];
__freg_t __fp_regs[32];
} __fp_r;
__greg_t __fp_csr;
};
struct __fpregset_oabi {
union {
double __fp_dregs[16];
float __fp_fregs[32];
__int32_t __fp_regs[32];
} __fp_r;
unsigned int __fp_csr;
unsigned int __fp_pad;
};
#if __mips_n32 || __mips_n64
typedef struct __fpregset_nabi __fpregset_t;
#else
typedef struct __fpregset_oabi __fpregset_t;
#endif
typedef struct {
__gregset_t __gregs;
__fpregset_t __fpregs;
__greg_t _mc_tlsbase;
#if !__mips_n32
__greg_t __mc_unused;
#endif
} mcontext_t;
#if defined(_KERNEL) && !defined(__mips_o32)
typedef __int32_t __greg32_t;
typedef __greg32_t __gregset32_t[_NGREG];
typedef struct {
__gregset32_t __gregs;
struct __fpregset_oabi __fpregs;
__greg32_t _mc_tlsbase;
__greg32_t __mc_unused;
} mcontext_o32_t;
typedef struct {
__gregset_t __gregs;
struct __fpregset_nabi __fpregs;
__greg_t _mc_tlsbase;
} mcontext32_t;
#endif /* _KERNEL && _LP64 */
#endif /* !__ASSEMBLER__ */
#define _UC_MACHINE_PAD 14 /* Padding appended to ucontext_t */
#define _UC_SETSTACK 0x00010000
#define _UC_CLRSTACK 0x00020000
#define _UC_TLSBASE 0x00040000
#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_S8])
#define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_EPC])
#define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_V0])
#define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc)
#define _UC_MACHINE32_SP(uc) _UC_MACHINE_SP(uc)
#define _UC_MACHINE32_PC(uc) _UC_MACHINE_PC(uc)
#define _UC_MACHINE32_INTRV(uc) _UC_MACHINE_INTRV(uc)
#define _UC_MACHINE32_PAD 14 /* Padding appended to ucontext32_t */
#define _UC_MACHINE32_SET_PC(uc, pc) _UC_MACHINE_PC((uc), (pc))
#define __UCONTEXT_SIZE_O32 (40 + 296 + 56) /* 392 */
#define __UCONTEXT_SIZE_N32 (40 + 568 + 56) /* 664 */
#define __UCONTEXT_SIZE_N64 (56 + 576 + 112) /* 774 */
#ifdef __mips_o32
#define __UCONTEXT_SIZE __UCONTEXT_SIZE_O32
#elif __mips_n32
#define __UCONTEXT_SIZE __UCONTEXT_SIZE_N32
#elif __mips_n64
#define __UCONTEXT_SIZE __UCONTEXT_SIZE_N64
#define __UCONTEXT32_SIZE __UCONTEXT_SIZE_N32
#else
#error O64 is not supported
#endif
#if defined(_LIBC_SOURCE) || defined(_RTLD_SOURCE) || defined(__LIBPTHREAD_SOURCE__)
#define TLS_TP_OFFSET 0x7000
#define TLS_DTV_OFFSET 0x8000
#include <sys/tls.h>
__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
__CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0);
__BEGIN_DECLS
static __inline struct tls_tcb *
__lwp_gettcb_fast(void)
{
struct tls_tcb *__tcb;
/*
* Only emit a rdhwr $3, $29 so the kernel can quickly emulate it.
*/
__asm __volatile(
#if 1
// For some reason the syscall is much faster than
// emulating rdhwr $3,$29 on a CN50xx
"addiu $2,$0,316; syscall; nop; move %[__tcb],$2"
#else
".set push"
";.set mips32r2"
";.p2align 4"
";ssnop"
";rdhwr $3,$29"
";ssnop"
";move %0,$3"
";.set pop"
#endif
: [__tcb]"=r"(__tcb)
:
: "v0", "v1", "a3");
return __tcb - (TLS_TP_OFFSET / sizeof(*__tcb) + 1);
}
void _lwp_setprivate(void *);
static inline void
__lwp_settcb(struct tls_tcb *__tcb)
{
__tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1;
_lwp_setprivate(__tcb);
}
__END_DECLS
#endif
#endif /* _MIPS_MCONTEXT_H_ */
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