From b01a54444fdf6c758355d99225798f926fb451c6 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penberg@cloudius-systems.com>
Date: Wed, 15 Jan 2014 10:44:07 +0200
Subject: [PATCH] mmu: procfs support
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Add procfs_maps() function to core/mmu.cc that returns all the VMAs
formatted for Linux compatible "/proc/<pid>/maps" file.
This will be called by the procfs filesystem.
Limitations:
* Shared mappings are not identified as such.
* File-backed mmap offset, device, inode, and pathname are not
reported.
* Special region names such as [heap] and [stack]Â are not reported.
Reviewed-by: Glauber Costa <glommer@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
---
core/mmu.cc | 16 ++++++++++++++++
include/mmu.hh | 2 ++
2 files changed, 18 insertions(+)
diff --git a/core/mmu.cc b/core/mmu.cc
index 3cac8fb5c..d7d54c673 100644
--- a/core/mmu.cc
+++ b/core/mmu.cc
@@ -1262,4 +1262,20 @@ error mincore(void *addr, size_t length, unsigned char *vec)
return no_error();
}
+std::string procfs_maps()
+{
+ std::ostringstream os;
+ WITH_LOCK(vma_list_mutex) {
+ for (auto& vma : vma_list) {
+ char read = vma.perm() & perm_read ? 'r' : '-';
+ char write = vma.perm() & perm_write ? 'w' : '-';
+ char execute = vma.perm() & perm_exec ? 'x' : '-';
+ char priv = 'p';
+ osv::fprintf(os, "%x-%x %c%c%c%c 00000000 00:00 0\n",
+ vma.start(), vma.end(), read, write, execute, priv);
+ }
+ }
+ return os.str();
+}
+
}
diff --git a/include/mmu.hh b/include/mmu.hh
index b6e001a04..2c257a4f4 100644
--- a/include/mmu.hh
+++ b/include/mmu.hh
@@ -194,6 +194,8 @@ void vdepopulate(void* addr, size_t size);
void vm_fault(uintptr_t addr, exception_frame* ef);
+std::string procfs_maps();
+
}
#endif
--
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