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Rewrite brk() and sbrk()

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This change reduces the .bss memory requirement for all executables by
O(64kb). The brk system calls are now fully tested and figured out and
might be useful for tiny programs that only target System Five.
This commit is contained in:
Justine Tunney 2022-10-01 23:11:56 -07:00
parent bc8532688b
commit 5005f2e446
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GPG key ID: BE714B4575D6E328
23 changed files with 643 additions and 294 deletions
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74
libc/runtime/runtime.h
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@ -8,43 +8,43 @@ COSMOPOLITAN_C_START_
typedef long jmp_buf[8];
extern char **environ; /* CRT */
extern int __argc; /* CRT */
extern char **__argv; /* CRT */
extern char **__envp; /* CRT */
extern unsigned long *__auxv; /* CRT */
extern intptr_t __oldstack; /* CRT */
extern uint64_t __nosync; /* SYS */
extern _Atomic(int) __ftrace; /* SYS */
extern _Atomic(int) __strace; /* SYS */
extern char *program_invocation_name; /* RII */
extern char *program_invocation_short_name; /* RII */
extern uint64_t __syscount; /* RII */
extern uint64_t kStartTsc; /* RII */
extern char kTmpPath[]; /* RII */
extern const char kNtSystemDirectory[]; /* RII */
extern const char kNtWindowsDirectory[]; /* RII */
extern unsigned char _base[] forcealign(PAGESIZE); /* αpε */
extern unsigned char _ehead[] forcealign(PAGESIZE); /* αpε */
extern unsigned char _etext[] forcealign(PAGESIZE); /* αpε */
extern unsigned char _edata[] forcealign(PAGESIZE); /* αpε */
extern unsigned char _ezip[]; /* αpε */
extern unsigned char _end[] forcealign(FRAMESIZE); /* αpε */
extern unsigned char _ereal[]; /* αpε */
extern unsigned char __privileged_start[]; /* αpε */
extern unsigned char __privileged_addr[]; /* αpε */
extern unsigned char __privileged_size[]; /* αpε */
extern unsigned char __privileged_end[]; /* αpε */
extern unsigned char __test_start[]; /* αpε */
extern unsigned char __ro[]; /* αpε */
extern unsigned char *__relo_start[]; /* αpε */
extern unsigned char *__relo_end[]; /* αpε */
extern uint8_t __zip_start[]; /* αpε */
extern uint8_t __zip_end[]; /* αpε */
extern uint8_t __data_start[]; /* αpε */
extern uint8_t __data_end[]; /* αpε */
extern uint8_t __bss_start[]; /* αpε */
extern uint8_t __bss_end[]; /* αpε */
extern char **environ; /* CRT */
extern int __argc; /* CRT */
extern char **__argv; /* CRT */
extern char **__envp; /* CRT */
extern unsigned long *__auxv; /* CRT */
extern intptr_t __oldstack; /* CRT */
extern uint64_t __nosync; /* SYS */
extern _Atomic(int) __ftrace; /* SYS */
extern _Atomic(int) __strace; /* SYS */
extern char *program_invocation_name; /* RII */
extern char *program_invocation_short_name; /* RII */
extern uint64_t __syscount; /* RII */
extern uint64_t kStartTsc; /* RII */
extern char kTmpPath[]; /* RII */
extern const char kNtSystemDirectory[]; /* RII */
extern const char kNtWindowsDirectory[]; /* RII */
extern unsigned char _base[]; /* αpε */
extern unsigned char _ehead[]; /* αpε */
extern unsigned char _etext[]; /* αpε */
extern unsigned char _edata[]; /* αpε */
extern unsigned char _ezip[]; /* αpε */
extern unsigned char _end[]; /* αpε */
extern unsigned char _ereal[]; /* αpε */
extern unsigned char __privileged_start[]; /* αpε */
extern unsigned char __privileged_addr[]; /* αpε */
extern unsigned char __privileged_size[]; /* αpε */
extern unsigned char __privileged_end[]; /* αpε */
extern unsigned char __test_start[]; /* αpε */
extern unsigned char __ro[]; /* αpε */
extern unsigned char *__relo_start[]; /* αpε */
extern unsigned char *__relo_end[]; /* αpε */
extern uint8_t __zip_start[]; /* αpε */
extern uint8_t __zip_end[]; /* αpε */
extern uint8_t __data_start[]; /* αpε */
extern uint8_t __data_end[]; /* αpε */
extern uint8_t __bss_start[]; /* αpε */
extern uint8_t __bss_end[]; /* αpε */
extern size_t __virtualmax;
extern bool __isworker;