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Date: Mon, 05 May 2008 17:24:04 +0200
From: Peter Oberparleiter <peter.oberparleiter@...ibm.com>
To: linux-kernel@...r.kernel.org
CC: ltp-list@...ts.sourceforge.net, ltp-coverage@...ts.sourceforge.net,
Andrew Morton <akpm@...ux-foundation.org>, sam@...nborg.org
Subject: [RFC PATCH 1/6] kernel: call constructors
From: Peter Oberparleiter <peter.oberparleiter@...ibm.com>
Call constructors during kernel init and module load. Required by the
gcov profiling infrastructure: gcc's profiling code uses constructors
to register profiling data structures.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@...ibm.com>
---
arch/powerpc/kernel/vmlinux.lds.S | 3 +++
include/asm-generic/sections.h | 1 +
include/asm-generic/vmlinux.lds.h | 8 ++++++++
include/linux/module.h | 5 +++++
init/main.c | 10 ++++++++++
kernel/module.c | 13 +++++++++++++
6 files changed, 40 insertions(+)
Index: linux-2.6.26-rc1/include/asm-generic/vmlinux.lds.h
===================================================================
--- linux-2.6.26-rc1.orig/include/asm-generic/vmlinux.lds.h
+++ linux-2.6.26-rc1/include/asm-generic/vmlinux.lds.h
@@ -352,3 +352,11 @@
*(.data.percpu.shared_aligned) \
} \
__per_cpu_end = .;
+
+#define CONSTRUCTORS \
+ __CTOR_LIST__ = .; \
+ *(.ctors) \
+ __CTOR_END__ = .; \
+ __DTOR_LIST__ = .; \
+ *(.dtors) \
+ __DTOR_END__ = .;
Index: linux-2.6.26-rc1/arch/powerpc/kernel/vmlinux.lds.S
===================================================================
--- linux-2.6.26-rc1.orig/arch/powerpc/kernel/vmlinux.lds.S
+++ linux-2.6.26-rc1/arch/powerpc/kernel/vmlinux.lds.S
@@ -193,6 +193,9 @@ SECTIONS
*(.toc)
}
#endif
+ .data.gcov : {
+ CONSTRUCTORS
+ }
. = ALIGN(PAGE_SIZE);
_edata = .;
Index: linux-2.6.26-rc1/include/asm-generic/sections.h
===================================================================
--- linux-2.6.26-rc1.orig/include/asm-generic/sections.h
+++ linux-2.6.26-rc1/include/asm-generic/sections.h
@@ -13,5 +13,6 @@ extern char __per_cpu_start[], __per_cpu
extern char __kprobes_text_start[], __kprobes_text_end[];
extern char __initdata_begin[], __initdata_end[];
extern char __start_rodata[], __end_rodata[];
+extern char __CTOR_LIST__[], __CTOR_END__[];
#endif /* _ASM_GENERIC_SECTIONS_H_ */
Index: linux-2.6.26-rc1/include/linux/module.h
===================================================================
--- linux-2.6.26-rc1.orig/include/linux/module.h
+++ linux-2.6.26-rc1/include/linux/module.h
@@ -229,6 +229,8 @@ enum module_state
MODULE_STATE_GOING,
};
+typedef void (*ctorcall_t)(void);
+
struct module
{
enum module_state state;
@@ -342,6 +344,9 @@ struct module
struct marker *markers;
unsigned int num_markers;
#endif
+ /* Constructor calls. */
+ ctorcall_t *ctors;
+ unsigned long num_ctors;
};
#ifndef MODULE_ARCH_INIT
#define MODULE_ARCH_INIT {}
Index: linux-2.6.26-rc1/kernel/module.c
===================================================================
--- linux-2.6.26-rc1.orig/kernel/module.c
+++ linux-2.6.26-rc1/kernel/module.c
@@ -1736,6 +1736,7 @@ static struct module *load_module(void _
unsigned int unusedgplcrcindex;
unsigned int markersindex;
unsigned int markersstringsindex;
+ unsigned int ctorsindex;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1832,6 +1833,7 @@ static struct module *load_module(void _
#ifdef ARCH_UNWIND_SECTION_NAME
unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
#endif
+ ctorsindex = find_sec(hdr, sechdrs, secstrings, ".ctors");
/* Don't keep modinfo and version sections. */
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
@@ -2041,6 +2043,8 @@ static struct module *load_module(void _
mod->num_markers =
sechdrs[markersindex].sh_size / sizeof(*mod->markers);
#endif
+ mod->ctors = (void *) sechdrs[ctorsindex].sh_addr;
+ mod->num_ctors = sechdrs[ctorsindex].sh_size / sizeof(*mod->ctors);
/* Find duplicate symbols */
err = verify_export_symbols(mod);
@@ -2153,6 +2157,14 @@ static struct module *load_module(void _
goto free_hdr;
}
+static void do_mod_ctors(struct module *mod)
+{
+ unsigned long i;
+
+ for (i = 0; i < mod->num_ctors; i++)
+ mod->ctors[i]();
+}
+
/* This is where the real work happens */
asmlinkage long
sys_init_module(void __user *umod,
@@ -2183,6 +2195,7 @@ sys_init_module(void __user *umod,
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_COMING, mod);
+ do_mod_ctors(mod);
/* Start the module */
if (mod->init != NULL)
ret = mod->init();
Index: linux-2.6.26-rc1/init/main.c
===================================================================
--- linux-2.6.26-rc1.orig/init/main.c
+++ linux-2.6.26-rc1/init/main.c
@@ -683,6 +683,15 @@ asmlinkage void __init start_kernel(void
rest_init();
}
+static void __init do_ctors(void)
+{
+ ctorcall_t *call;
+
+ for (call = (ctorcall_t *) __CTOR_LIST__;
+ call < (ctorcall_t *) __CTOR_END__; call++)
+ (*call)();
+}
+
static int __initdata initcall_debug;
static int __init initcall_debug_setup(char *str)
@@ -760,6 +769,7 @@ static void __init do_basic_setup(void)
usermodehelper_init();
driver_init();
init_irq_proc();
+ do_ctors();
do_initcalls();
}
--
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