154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* Copyright (c) 2020 Institute of Parallel And Distributed Systems (IPADS), Shanghai Jiao Tong University (SJTU)
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* OS-Lab-2020 (i.e., ChCore) is licensed under the Mulan PSL v1.
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* You can use this software according to the terms and conditions of the Mulan PSL v1.
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* You may obtain a copy of Mulan PSL v1 at:
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* http://license.coscl.org.cn/MulanPSL
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
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* PURPOSE.
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* See the Mulan PSL v1 for more details.
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*/
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#include <common/util.h>
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#include "thread_env.h"
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/*
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* Setup the initial environment for a user process (main thread).
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*
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* According to Libc convention, we current set the environment
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* on the user stack.
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*
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*/
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#define AT_NULL 0 /* end of vector */
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#define AT_IGNORE 1 /* entry should be ignored */
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#define AT_EXECFD 2 /* file descriptor of program */
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#define AT_PHDR 3 /* program headers for program */
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#define AT_PHENT 4 /* size of program header entry */
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#define AT_PHNUM 5 /* number of program headers */
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#define AT_PAGESZ 6 /* system page size */
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#define AT_BASE 7 /* base address of interpreter */
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#define AT_FLAGS 8 /* flags */
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#define AT_ENTRY 9 /* entry point of program */
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#define AT_NOTELF 10 /* program is not ELF */
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#define AT_UID 11 /* real uid */
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#define AT_EUID 12 /* effective uid */
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#define AT_GID 13 /* real gid */
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#define AT_EGID 14 /* effective gid */
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#define AT_PLATFORM 15 /* string identifying CPU for optimizations */
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#define AT_HWCAP 16 /* arch dependent hints at CPU capabilities */
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#define AT_CLKTCK 17 /* frequency at which times() increments */
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/* AT_* values 18 through 22 are reserved */
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#define AT_SECURE 23 /* secure mode boolean */
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/* string identifying real platform, may differ from AT_PLATFORM. */
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#define AT_BASE_PLATFORM 24
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#define AT_RANDOM 25 /* address of 16 random bytes */
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#define AT_HWCAP2 26 /* extension of AT_HWCAP */
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#define AT_EXECFN 31 /* filename of program */
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const char PLAT[] = "aarch64";
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/*
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* For setting up the stack (env) of some process.
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*
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* env: stack top address used by kernel
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* top_vaddr: stack top address mapped to user
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*/
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void prepare_env(char *env, u64 top_vaddr, struct process_metadata *meta,
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char *name)
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{
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int i;
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char *name_str;
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char *plat_str;
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u64 *buf;
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env -= ENV_SIZE_ON_STACK;
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/* clear env */
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memset(env, 0, ENV_SIZE_ON_STACK);
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/* strings */
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/* the last 64 bytes */
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name_str = env + 0x1000 - 64;
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i = 0;
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while (name[i] != '\0') {
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name_str[i] = name[i];
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++i;
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}
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/* the second last 64 bytes */
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plat_str = env + 0x1000 - 2 * 64;
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i = 0;
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while (PLAT[i] != '\0') {
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plat_str[i] = PLAT[i];
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++i;
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}
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buf = (u64 *) env;
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/* argc */
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*buf = 1;
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/* argv */
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*(buf + 1) = top_vaddr - 64;
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*(buf + 2) = (u64) NULL;
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/* add more argv here */
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/* envp */
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*(buf + 3) = (u64) NULL;
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/* add more envp here */
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/* auxv */
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i = 4;
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*(buf + i + 0) = AT_SECURE;
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*(buf + i + 1) = 0;
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*(buf + i + 2) = AT_PAGESZ;
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*(buf + i + 3) = 0x1000;
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*(buf + i + 4) = AT_PHDR;
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*(buf + i + 5) = meta->phdr_addr;
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*(buf + i + 6) = AT_PHENT;
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*(buf + i + 7) = meta->phentsize;
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*(buf + i + 8) = AT_PHNUM;
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*(buf + i + 9) = meta->phnum;
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*(buf + i + 10) = AT_FLAGS;
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*(buf + i + 11) = meta->flags;
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*(buf + i + 12) = AT_ENTRY;
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*(buf + i + 13) = meta->entry;
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*(buf + i + 14) = AT_UID;
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*(buf + i + 15) = 1000;
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*(buf + i + 16) = AT_EUID;
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*(buf + i + 17) = 1000;
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*(buf + i + 18) = AT_GID;
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*(buf + i + 19) = 1000;
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*(buf + i + 20) = AT_EGID;
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*(buf + i + 21) = 1000;
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*(buf + i + 22) = AT_CLKTCK;
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*(buf + i + 23) = 100;
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*(buf + i + 24) = AT_HWCAP;
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*(buf + i + 25) = 0;
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*(buf + i + 26) = AT_PLATFORM;
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*(buf + i + 27) = top_vaddr - 64 * 2;
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*(buf + i + 28) = AT_RANDOM;
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*(buf + i + 29) = top_vaddr - 64; /* random 16 bytes */
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*(buf + i + 30) = AT_NULL;
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*(buf + i + 31) = 0;
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/* add more auxv here */
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}
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