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Introduce MAP_HUGETLB

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Justine Tunney 2024-05-22 12:10:03 -07:00
parent 9b87dd2b87
commit f029375d39
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GPG key ID: BE714B4575D6E328
6 changed files with 7 additions and 3 deletions
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3
libc/calls/pledge-linux.c
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@ -1641,7 +1641,6 @@ static privileged void AllowMmapExec(struct Filter *f) {
//
// - MAP_LOCKED (0x02000)
// - MAP_NONBLOCK (0x10000)
// - MAP_HUGETLB (0x40000)
//
static privileged void AllowMmapNoexec(struct Filter *f) {
static const struct sock_filter fragment[] = {
@ -1650,7 +1649,7 @@ static privileged void AllowMmapNoexec(struct Filter *f) {
/*L2*/ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, ~(PROT_READ | PROT_WRITE)),
/*L3*/ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 8 - 4),
/*L4*/ BPF_STMT(BPF_LD | BPF_W | BPF_ABS, OFF(args[3])), // flags
/*L5*/ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0x52000),
/*L5*/ BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0x12000),
/*L6*/ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1),
/*L7*/ BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW),
/*L8*/ BPF_STMT(BPF_LD | BPF_W | BPF_ABS, OFF(nr)),

1
libc/intrin/describemapflags.c
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@ -30,6 +30,7 @@ const char *(DescribeMapFlags)(char buf[64], int x) {
{MAP_SHARED, "SHARED"}, //
{MAP_FIXED, "FIXED"}, //
{MAP_FIXED_NOREPLACE, "FIXED_NOREPLACE"}, //
{MAP_HUGETLB, "HUGETLB"}, //
{MAP_CONCEAL, "CONCEAL"}, //
{MAP_LOCKED, "LOCKED"}, //
{MAP_NORESERVE, "NORESERVE"}, //

1
libc/sysv/consts.sh
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@ -230,6 +230,7 @@ syscon mmap MAP_NORESERVE 0x00004000 0x00004000 0x00000040 0x00000040 0
syscon mmap MAP_POPULATE 0x00008000 0x00008000 0 0 0x00040000 0 0 0 # MAP_PREFAULT_READ on FreeBSD; can avoid madvise(MADV_WILLNEED) on private file mapping
syscon mmap MAP_NONBLOCK 0x00010000 0x00010000 0 0 0 0 0 0
syscon mmap MAP_SYNC 0x00080000 0x00080000 0 0 0 0 0 0 # perform synchronous page faults for mapping (Linux 4.15+)
syscon mmap MAP_HUGETLB 0x00040000 -1 -1 -1 -1 -1 -1 -1 # make it inherit across execve()
syscon mmap MAP_INHERIT -1 -1 -1 -1 -1 -1 0x00000080 -1 # make it inherit across execve()
syscon mmap MAP_HASSEMAPHORE 0 0 0x00000200 0x00000200 0x00000200 0 0x00000200 0 # does it matter on x86?
syscon mmap MAP_NOSYNC 0 0 0 0 0x00000800 0 0 0 # flush to physical media only when necessary rather than gratuitously; be sure to use write() rather than ftruncate() with this!

2
libc/sysv/consts/MAP_HUGETLB.S Normal file
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@ -0,0 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon mmap,MAP_HUGETLB,0x00040000,-1,-1,-1,-1,-1,-1,-1

1
libc/sysv/consts/map.h
View file

@ -13,6 +13,7 @@ extern const int MAP_FILE;
extern const int MAP_FIXED;
extern const int MAP_FIXED_NOREPLACE;
extern const int MAP_HASSEMAPHORE;
extern const int MAP_HUGETLB;
extern const int MAP_INHERIT;
extern const int MAP_JIT;
extern const int MAP_LOCKED;

2
third_party/dlmalloc/platform.inc vendored
View file

@ -111,7 +111,7 @@
#if (MORECORE_CONTIGUOUS || defined(WIN32))
#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
#else /* MORECORE_CONTIGUOUS */
#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
#define DEFAULT_GRANULARITY ((size_t)256U * (size_t)1024U)
#endif /* MORECORE_CONTIGUOUS */
#endif /* DEFAULT_GRANULARITY */
#ifndef DEFAULT_TRIM_THRESHOLD