Merge branch 'memory' into 'master'

Make munmap use funmap2

See merge request redox-os/relibc!297

.editorconfig

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Cargo.toml

@@ -39,7 +39,7 @@ optional = true
 sc = "0.2.2"
 
 [target.'cfg(target_os = "redox")'.dependencies]
-redox_syscall = { git = "https://gitlab.redox-os.org/redox-os/syscall", rev = "0e1e7d5d" }
+redox_syscall = { git = "https://gitlab.redox-os.org/redox-os/syscall", rev = "a0ea09ceb3380b1d1e878bb18886e13742d34e8a" }
 spin = "0.4.10"
 
 [features]

redoxer.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-if [[ "$(cargo install --list | grep '^redoxer ')" != "redoxer "* ]]
+if ! which redoxer
 then
     cargo install redoxer
 fi

src/header/sys_mman/linux.rs

@@ -4,3 +4,6 @@ pub const PROT_READ: c_int = 0x0001;
 pub const PROT_WRITE: c_int = 0x0002;
 pub const PROT_EXEC: c_int = 0x0004;
 pub const PROT_NONE: c_int = 0x0000;
+
+pub const MAP_FIXED: c_int = 0x0010;
+pub const MAP_FIXED_NOREPLACE: c_int = 0x100000;

src/header/sys_mman/mod.rs

@@ -17,7 +17,6 @@ pub mod sys;
 pub const MAP_SHARED: c_int = 0x0001;
 pub const MAP_PRIVATE: c_int = 0x0002;
 pub const MAP_TYPE: c_int = 0x000F;
-pub const MAP_FIXED: c_int = 0x0010;
 pub const MAP_ANON: c_int = 0x0020;
 pub const MAP_ANONYMOUS: c_int = MAP_ANON;
 

src/header/sys_mman/redox.rs

@@ -4,3 +4,6 @@ pub const PROT_NONE: c_int = 0x0000;
 pub const PROT_EXEC: c_int = 0x0001;
 pub const PROT_WRITE: c_int = 0x0002;
 pub const PROT_READ: c_int = 0x0004;
+
+pub const MAP_FIXED: c_int = 0x0004;
+pub const MAP_FIXED_NOREPLACE: c_int = 0x000C;

src/platform/redox/mod.rs

@@ -1,7 +1,7 @@
 use core::{mem, ptr, result::Result as CoreResult, slice};
 use syscall::{
     self,
-    data::{Map, Stat as redox_stat, StatVfs as redox_statvfs, TimeSpec as redox_timespec},
+    data::{Map2, Stat as redox_stat, StatVfs as redox_statvfs, TimeSpec as redox_timespec},
     PtraceEvent, Result,
 };
 
@@ -658,19 +658,20 @@ impl Pal for Sys {
     }
 
     unsafe fn mmap(
-        _addr: *mut c_void,
+        addr: *mut c_void,
         len: usize,
         prot: c_int,
         flags: c_int,
         fildes: c_int,
         off: off_t,
     ) -> *mut c_void {
-        let map = Map {
+        let map = Map2 {
             offset: off as usize,
             size: len,
             flags: syscall::MapFlags::from_bits_truncate(
                 ((prot as usize) << 16) | ((flags as usize) & 0xFFFF),
             ),
+            address: addr as usize,
         };
 
         if flags & MAP_ANON == MAP_ANON {
@@ -682,13 +683,13 @@ impl Pal for Sys {
                 return !0 as *mut c_void;
             }
 
-            let addr = e(syscall::fmap(fd, &map)) as *mut c_void;
+            let addr = e(syscall::fmap2(fd, &map)) as *mut c_void;
 
             let _ = syscall::close(fd);
 
             addr
         } else {
-            e(syscall::fmap(fildes as usize, &map)) as *mut c_void
+            e(syscall::fmap2(fildes as usize, &map)) as *mut c_void
         }
     }
 
@@ -713,8 +714,8 @@ impl Pal for Sys {
         */
     }
 
-    unsafe fn munmap(addr: *mut c_void, _len: usize) -> c_int {
-        if e(syscall::funmap(addr as usize)) == !0 {
+    unsafe fn munmap(addr: *mut c_void, len: usize) -> c_int {
+        if e(syscall::funmap2(addr as usize, len)) == !0 {
             return !0;
         }
         0
@@ -995,7 +996,6 @@ impl Pal for Sys {
         let mut sessions = state.sessions.lock();
         if let Ok(session) = ptrace::get_session(&mut sessions, pid) {
             if options & sys_wait::WNOHANG != sys_wait::WNOHANG {
-                let _ = (&mut &session.tracer).write(&syscall::PTRACE_FLAG_WAIT);
                 let mut _event = PtraceEvent::default();
                 let _ = (&mut &session.tracer).read(&mut _event);
 

src/platform/redox/ptrace.rs

@@ -64,7 +64,7 @@ pub fn get_session(
                     first: true,
                     tracer: File::open(
                         &CString::new(format!("proc:{}/trace", pid)).unwrap(),
-                        NEW_FLAGS | fcntl::O_NONBLOCK,
+                        NEW_FLAGS,
                     )?,
                     mem: File::open(
                         &CString::new(format!("proc:{}/mem", pid)).unwrap(),

tests/Makefile

@@ -19,7 +19,7 @@ EXPECT_NAMES=\
 	math \
 	netdb/getaddrinfo \
 	netdb/netdb \
-    ptrace \
+	ptrace \
 	regex \
 	select \
 	setjmp \
@@ -76,6 +76,7 @@ EXPECT_NAMES=\
 	string/strtok_r \
 	string/strsignal \
 	strings \
+	sys_mman \
 	time/asctime \
 	time/gmtime \
 	time/localtime \

tests/sys_mman.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "test_helpers.h"
+
+int main() {
+    int page_size = getpagesize();
+    printf("Page size: %d\n", page_size);
+
+    puts("Mapping 1 page of memory...");
+    char *map1 = mmap((void *) 0x200000000, (size_t) page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE, -1, 0);
+    puts("Mapping 3 pages of memory...");
+    char *map2 = mmap(map1 + page_size, (size_t) page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE, -1, 0);
+
+    ERROR_IF(mmap, map1, == MAP_FAILED);
+    ERROR_IF(mmap, map2, == MAP_FAILED);
+
+    puts("Randomizing mapping #1");
+    for (int i = 0; i < page_size; ++i) {
+        map1[i] = (char) (rand() & 0xFF);
+    }
+    puts("Randomizing mapping #2");
+    for (int i = 0; i < page_size * 3; ++i) {
+        map2[i] = (char) (rand() & 0xFF);
+    }
+
+    puts("Unmapping page 2 of map2");
+    munmap(map2 + page_size, page_size);
+
+    puts("Randomizing page 1 of mapping #2");
+    for (int i = 0; i < page_size; ++i) {
+        map2[i] = (char) (rand() % 256);
+    }
+
+    puts("Randomizing page 3 of mapping #2");
+    for (int i = 0; i < page_size; ++i) {
+        map2[page_size * 2 + i] = (char) (rand() % 256);
+    }
+
+    // Page fault:
+    // map2[page_size] = 0;
+
+    puts("Unmapping it all at once!");
+    munmap(map1, (size_t) page_size * 4);
+
+    // Page fault:
+    // *map2 = 0;
+}