diff options
Diffstat (limited to 'kernel/arch/x86_64')
| -rw-r--r-- | kernel/arch/x86_64/contextspfunc.S | 55 | ||||
| -rw-r--r-- | kernel/arch/x86_64/execregs.c | 156 | ||||
| -rw-r--r-- | kernel/arch/x86_64/execregs.h | 81 | ||||
| -rw-r--r-- | kernel/arch/x86_64/execsp.S | 111 | ||||
| -rw-r--r-- | kernel/arch/x86_64/h_execregs.S | 82 | ||||
| -rw-r--r-- | kernel/arch/x86_64/signalsphandler.S | 55 | ||||
| -rw-r--r-- | kernel/arch/x86_64/stack_pointer.h | 35 | ||||
| -rw-r--r-- | kernel/arch/x86_64/threadspfunc.S | 54 |
8 files changed, 629 insertions, 0 deletions
diff --git a/kernel/arch/x86_64/contextspfunc.S b/kernel/arch/x86_64/contextspfunc.S new file mode 100644 index 000000000000..d01e1dcdcaf3 --- /dev/null +++ b/kernel/arch/x86_64/contextspfunc.S @@ -0,0 +1,55 @@ +/* $NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#define _LOCORE + +#include <machine/asm.h> + +RCSID("$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $") + +/* + * contextspfunc() + * + * makecontext(3) function. Store the stack pointer on entry at + * the global variable contextsp and call contextdone. + */ +ENTRY(contextspfunc) + /* + * `The end of the input argument area shall be aligned on a + * [16-byte] boundary. In other words, the value of (%rsp + 8) + * is always a multiple of 16 when control is transferred to + * the function entry point.' + * + * To make it convenient for t_signal_and_sp.c, we subtract 8 + * from %rsp in order to get something congruent to zero modulo + * the stack alignemnt. + */ + movq %rsp,_C_LABEL(contextsp)(%rip) + addq $-8,_C_LABEL(contextsp)(%rip) + call _C_LABEL(contextdone) +END(contextspfunc) diff --git a/kernel/arch/x86_64/execregs.c b/kernel/arch/x86_64/execregs.c new file mode 100644 index 000000000000..fad1b40daa5e --- /dev/null +++ b/kernel/arch/x86_64/execregs.c @@ -0,0 +1,156 @@ +/* $NetBSD: execregs.c,v 1.1 2025/02/27 00:55:32 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#include <sys/cdefs.h> +__RCSID("$NetBSD: execregs.c,v 1.1 2025/02/27 00:55:32 riastradh Exp $"); + +#include "execregs.h" + +#include <errno.h> +#include <spawn.h> +#include <stddef.h> +#include <unistd.h> + +extern char **environ; + +static unsigned long +nonnull(unsigned long x) +{ + + x |= x << 8; + x |= x << 16; + x |= x << 32; + return x; +} + +int +execregschild(char *path) +{ + /* rdi: used to pass exec arg0, nonnull anyway (path) */ + /* rsi: used to pass exec arg1, nonnull anyway (argv) */ + /* rdx: used to pass exec arg2, nonnull anyway (environ) */ + register long r10 __asm("r10") = nonnull(10); + register long r8 __asm("r8") = nonnull(8); + register long r9 __asm("r9") = nonnull(9); + register long rcx __asm("rcx") = nonnull('c'); + register long r11 __asm("r11") = nonnull(11); + register long r12 __asm("r12") = nonnull(12); + register long r13 __asm("r13") = nonnull(13); + register long r14 __asm("r14") = nonnull(14); + register long r15 __asm("r15") = nonnull(15); + /* rbp: frame pointer, can't touch that here, but it'll be nonnull */ + /* rbx: ps_strings, passed to child */ + register long rax __asm("rax") = nonnull('a'); + + char *argv[] = {path, NULL}; + char **envp = environ; + + /* + * Not perfect -- compiler might use some registers for + * stack/argument transfers, but all the arguments are nonnull + * so this is probably a good test anyway. + */ + __asm volatile("" : + "+r"(r10), + "+r"(r8), + "+r"(r9), + "+r"(rcx), + "+r"(r11), + "+r"(r12), + "+r"(r13), + "+r"(r14), + "+r"(r15), + "+r"(rax) + :: "memory"); + + return execve(path, argv, envp); +} + +pid_t +spawnregschild(char *path, int fd) +{ + /* rdi: used to pass posix_spawn arg0, nonnull anyway (&pid) */ + /* rsi: used to pass posix_spawn arg1, nonnull anyway (path) */ + /* rdx: used to pass posix_spawn arg2, nonnull anyway (&fileacts) */ + register long r10 __asm("r10") = nonnull(10); + /* r8: used to pass posix_spawn arg4, nonnull anyway (argv) */ + /* r9: used to pass posix_spawn arg5, nonnull anyway (environ) */ + /* rcx: used to pass posix_spawn arg3, nonnull anyway (&attr) */ + register long r11 __asm("r11") = nonnull(11); + register long r12 __asm("r12") = nonnull(12); + register long r13 __asm("r13") = nonnull(13); + register long r14 __asm("r14") = nonnull(14); + register long r15 __asm("r15") = nonnull(15); + /* rbp: frame pointer, can't touch that here, but it'll be nonnull */ + /* rbx: ps_strings, passed to child */ + register long rax __asm("rax") = nonnull('a'); + + char *argv[] = {path, NULL}; + char **envp = environ; + posix_spawn_file_actions_t fileacts; + posix_spawnattr_t attr; + pid_t pid; + int error; + + error = posix_spawn_file_actions_init(&fileacts); + if (error) + goto out; + error = posix_spawn_file_actions_adddup2(&fileacts, fd, STDOUT_FILENO); + if (error) + goto out; + error = posix_spawnattr_init(&attr); + if (error) + goto out; + + /* + * Not perfect -- compiler might use some registers for + * stack/argument transfers, but all the arguments are nonnull + * so this is probably a good test anyway. + */ + __asm volatile("" : + "+r"(r10), + "+r"(r11), + "+r"(r12), + "+r"(r13), + "+r"(r14), + "+r"(r15), + "+r"(rax) + :: "memory"); + + error = posix_spawn(&pid, path, &fileacts, &attr, argv, envp); + if (error) + goto out; + +out: posix_spawnattr_destroy(&attr); + posix_spawn_file_actions_destroy(&fileacts); + if (error) { + errno = error; + return -1; + } + return 0; +} diff --git a/kernel/arch/x86_64/execregs.h b/kernel/arch/x86_64/execregs.h new file mode 100644 index 000000000000..904991777483 --- /dev/null +++ b/kernel/arch/x86_64/execregs.h @@ -0,0 +1,81 @@ +/* $NetBSD: execregs.h,v 1.1 2025/02/27 00:55:32 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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 TESTS_KERNEL_ARCH_X86_64_EXECREGS_H +#define TESTS_KERNEL_ARCH_X86_64_EXECREGS_H + +#include <sys/cdefs.h> + +#define NEXECREGS 14 + +#ifndef _LOCORE + +#include <unistd.h> + +/* + * Ordered by _FRAME_REG in sys/arch/amd64/include/frame_regs.h for + * convenience of auditing. Must match h_execregs.S. + */ +static const char *const regname[] = { + "rdi", + "rsi", + "rdx", + "r10", + "r8", + "r9", + /* arg6: syscall arg from stack, not a real register */ + /* arg7: syscall arg from stack, not a real register */ + /* arg8: syscall arg from stack, not a real register */ + /* arg9: syscall arg from stack, not a real register */ + "rcx", + "r11", + "r12", + "r13", + "r14", + "r15", + "rbp", + /* rbx: ps_strings */ + "rax", + /* gs/fs/es/ds: segment registers, not really registers */ + /* trapno: not a register */ + /* err: not a register */ + /* rip: instruction pointer */ + /* cs: segment register */ + /* rflags */ + /* rsp: stack pointer */ + /* ss: stack selector */ +}; + +__CTASSERT(NEXECREGS == __arraycount(regname)); + +int execregschild(char *); +pid_t spawnregschild(char *, int); + +#endif /* _LOCORE */ + +#endif /* TESTS_KERNEL_ARCH_X86_64_EXECREGS_H */ diff --git a/kernel/arch/x86_64/execsp.S b/kernel/arch/x86_64/execsp.S new file mode 100644 index 000000000000..d351dfb2d9e8 --- /dev/null +++ b/kernel/arch/x86_64/execsp.S @@ -0,0 +1,111 @@ +/* $NetBSD: execsp.S,v 1.2 2025/04/20 22:31:25 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#define _LOCORE + +#include <machine/asm.h> + +RCSID("$NetBSD: execsp.S,v 1.2 2025/04/20 22:31:25 riastradh Exp $") + +/* + * void execsp_start(void (*cleanup@rbx)(void), void *obj_main@rcx, + * struct ps_strings *ps_strings@rbx) + * + * ELF entry point. Saves the stack pointer in startsp and defers + * to the usual csu __start routine. + */ +ENTRY(execsp_start) + movq %rsp,_C_LABEL(startsp)(%rip) + /* + * No adjustment like in main because entry point is special + * and the amd64 csu __start routine takes care of it. + * + * XXX Why don't we just arrange to align it in the kernel + * anyway? + */ + jmp _C_LABEL(__start) +END(execsp_start) + +/* + * void execsp_ctor(void) + * + * ELF constructor. Saves the stack pointer in ctorsp and + * returns. + */ +ENTRY(execsp_ctor) + /* + * `The end of the input argument area shall be aligned on a + * [16-byte] boundary. In other words, the value of (%rsp + 8) + * is always a multiple of 16 when control is transferred to + * the function entry point.' + * + * To make it convenient for t_signal_and_sp.c, we subtract 8 + * from %rsp in order to get something congruent to zero modulo + * the stack alignemnt. + */ + movq %rsp,_C_LABEL(ctorsp)(%rip) + addq $-8,_C_LABEL(ctorsp)(%rip) + ret +END(execsp_ctor) + + /* Make execsp_ctor a constructor. */ + .section .ctors,"aw",@progbits + .p2align 3 + .quad _C_LABEL(execsp_ctor) + +/* + * int main(int argc@rdi, char **argv@rsi, ...) + * + * Main function. Saves the stack pointer in mainsp and returns + * zero. We will call execsp_main in execsp_dtor once dtorsp has + * been initialized. + */ +ENTRY(main) + movq %rsp,_C_LABEL(mainsp)(%rip) + addq $-8,_C_LABEL(mainsp)(%rip) + xorl %eax,%eax + ret +END(main) + +/* + * void execsp_dtor(void) + * + * ELF destructor. Saves the stack pointer in dtorsp and defers + * to the C execsp_main in h_execsp.c to report the stack pointers + * back to the t_signal_and_sp parent. + */ +ENTRY(execsp_dtor) + movq %rsp,_C_LABEL(dtorsp)(%rip) + addq $-8,_C_LABEL(dtorsp)(%rip) + jmp _C_LABEL(execsp_main) +END(execsp_dtor) + + /* Make execsp_ctor a destructor. */ + .section .dtors,"aw",@progbits + .p2align 3 + .quad _C_LABEL(execsp_dtor) diff --git a/kernel/arch/x86_64/h_execregs.S b/kernel/arch/x86_64/h_execregs.S new file mode 100644 index 000000000000..638f73940f06 --- /dev/null +++ b/kernel/arch/x86_64/h_execregs.S @@ -0,0 +1,82 @@ +/* $NetBSD: h_execregs.S,v 1.1 2025/02/27 00:55:32 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#define _LOCORE + +#include <sys/syscall.h> + +#include <machine/asm.h> + +#include "execregs.h" + +ENTRY(execregs_start) + andq $-0x10,%rsp /* align stack to 16-byte boundary */ + + /* store registers to a buffer on stack */ + subq $(NEXECREGS*8),%rsp /* space for NEXECREGS registers */ + movq %rdi,0*8(%rsp) /* order matches execregs.h */ + movq %rsi,1*8(%rsp) + movq %rdx,2*8(%rsp) + movq %r10,3*8(%rsp) + movq %r8,4*8(%rsp) + movq %r9,5*8(%rsp) + movq %rcx,6*8(%rsp) + movq %r11,7*8(%rsp) + movq %r12,8*8(%rsp) + movq %r13,9*8(%rsp) + movq %r14,10*8(%rsp) + movq %r15,11*8(%rsp) + movq %rbp,12*8(%rsp) + movq %rax,13*8(%rsp) + + /* call write(STDOUT_FILENO, regs, sizeof(regs)) */ + movl $0x1,%edi /* arg0 := STDOUT_FILENO */ + movq %rsp,%rsi /* arg1 := regs */ + movl $(NEXECREGS*8),%edx /* arg2 := sizeof(regs) */ + movl $SYS_write,%eax /* syscall number */ + syscall + + jb 2f /* bail if write failed */ + cmpq $(NEXECREGS*8),%rax /* bail if wrote wrong # of bytes */ + jne 2f + + /* call exit(0) */ + xorl %edi,%edi /* arg0 := 0 */ +1: movl $SYS_exit,%eax /* syscall number */ + syscall + hlt /* paranoia */ + +2: /* call exit(127) */ + movl $127,%edi /* arg0 := 127 */ + jmp 1b +END(execregs_start) + +/* main stub to simplify linking */ +ENTRY(main) + hlt +END(main) diff --git a/kernel/arch/x86_64/signalsphandler.S b/kernel/arch/x86_64/signalsphandler.S new file mode 100644 index 000000000000..b53cb005d0b0 --- /dev/null +++ b/kernel/arch/x86_64/signalsphandler.S @@ -0,0 +1,55 @@ +/* $NetBSD: signalsphandler.S,v 1.1 2025/04/20 22:31:01 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#define _LOCORE + +#include <machine/asm.h> + +RCSID("$NetBSD: signalsphandler.S,v 1.1 2025/04/20 22:31:01 riastradh Exp $") + +/* + * signalsphandler(signo@rdi) + * + * Signal handler. Store the stack pointer on entry at the global + * variable signalsp and return. + */ +ENTRY(signalsphandler) + /* + * `The end of the input argument area shall be aligned on a + * [16-byte] boundary. In other words, the value of (%rsp + 8) + * is always a multiple of 16 when control is transferred to + * the function entry point.' + * + * To make it convenient for t_signal_and_sp.c, we subtract 8 + * from %rsp in order to get something congruent to zero modulo + * the stack alignemnt. + */ + movq %rsp,_C_LABEL(signalsp)(%rip) + addq $-8,_C_LABEL(signalsp)(%rip) + ret +END(signalsphandler) diff --git a/kernel/arch/x86_64/stack_pointer.h b/kernel/arch/x86_64/stack_pointer.h new file mode 100644 index 000000000000..6ea297cf97d9 --- /dev/null +++ b/kernel/arch/x86_64/stack_pointer.h @@ -0,0 +1,35 @@ +/* $NetBSD: stack_pointer.h,v 1.1 2025/04/20 22:31:01 riastradh Exp $ */ + +/* + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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 TESTS_KERNEL_ARCH_X86_64_STACK_POINTER_H +#define TESTS_KERNEL_ARCH_X86_64_STACK_POINTER_H + +#define MISALIGN_SP __asm __volatile("addq $-1,%rsp") +#define FIX_SP __asm __volatile("addq $1,%rsp") + +#endif /* TESTS_KERNEL_ARCH_X86_64_STACK_POINTER_H */ diff --git a/kernel/arch/x86_64/threadspfunc.S b/kernel/arch/x86_64/threadspfunc.S new file mode 100644 index 000000000000..c939f36b408a --- /dev/null +++ b/kernel/arch/x86_64/threadspfunc.S @@ -0,0 +1,54 @@ +/* $NetBSD: threadspfunc.S,v 1.2 2025/04/21 12:06:08 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * 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. + */ + +#define _LOCORE + +#include <machine/asm.h> + +RCSID("$NetBSD: threadspfunc.S,v 1.2 2025/04/21 12:06:08 riastradh Exp $") + +/* + * void *threadspfunc(void *cookie@rdi) + * + * pthread_create(3) function. Return the stack pointer on entry. + */ +ENTRY(threadspfunc) + /* + * `The end of the input argument area shall be aligned on a + * [16-byte] boundary. In other words, the value of (%rsp + 8) + * is always a multiple of 16 when control is transferred to + * the function entry point.' + * + * To make it convenient for t_signal_and_sp.c, we subtract 8 + * from %rsp in order to get something congruent to zero modulo + * the stack alignemnt. + */ + movq %rsp,%rax + addq $-8,%rax + ret +END(threadspfunc) |