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-rw-r--r--arch/mips/kernel/Makefile2
-rw-r--r--arch/mips/kernel/cpufreq/loongson2_clock.c4
-rw-r--r--arch/mips/kernel/process.c7
-rw-r--r--arch/mips/kernel/signal-common.h5
-rw-r--r--arch/mips/kernel/signal.c86
-rw-r--r--arch/mips/kernel/signal32.c55
-rw-r--r--arch/mips/kernel/signal_n32.c26
-rw-r--r--arch/mips/kernel/smtc.c2
-rw-r--r--arch/mips/kernel/syscall.c6
-rw-r--r--arch/mips/kernel/traps.c2
-rw-r--r--arch/mips/kernel/vdso.c112
11 files changed, 169 insertions, 138 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index ef20957ca14..7a6ac501cbb 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -6,7 +6,7 @@ extra-y := head.o init_task.o vmlinux.lds
obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \
ptrace.o reset.o setup.o signal.o syscall.o \
- time.o topology.o traps.o unaligned.o watch.o
+ time.o topology.o traps.o unaligned.o watch.o vdso.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = -pg
diff --git a/arch/mips/kernel/cpufreq/loongson2_clock.c b/arch/mips/kernel/cpufreq/loongson2_clock.c
index d7ca256e33e..cefc6e259ba 100644
--- a/arch/mips/kernel/cpufreq/loongson2_clock.c
+++ b/arch/mips/kernel/cpufreq/loongson2_clock.c
@@ -164,3 +164,7 @@ void loongson2_cpu_wait(void)
spin_unlock_irqrestore(&loongson2_wait_lock, flags);
}
EXPORT_SYMBOL_GPL(loongson2_cpu_wait);
+
+MODULE_AUTHOR("Yanhua <yanh@lemote.com>");
+MODULE_DESCRIPTION("cpufreq driver for Loongson 2F");
+MODULE_LICENSE("GPL");
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 463b71b90a0..99960940d4a 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -63,8 +63,13 @@ void __noreturn cpu_idle(void)
smtc_idle_loop_hook();
#endif
- if (cpu_wait)
+
+ if (cpu_wait) {
+ /* Don't trace irqs off for idle */
+ stop_critical_timings();
(*cpu_wait)();
+ start_critical_timings();
+ }
}
#ifdef CONFIG_HOTPLUG_CPU
if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) &&
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index 6c8e8c4246f..10263b40598 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -26,11 +26,6 @@
*/
extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
size_t frame_size);
-/*
- * install trampoline code to get back from the sig handler
- */
-extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
-
/* Check and clear pending FPU exceptions in saved CSR */
extern int fpcsr_pending(unsigned int __user *fpcsr);
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index d0c68b5d717..2099d5a4c4b 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -32,6 +32,7 @@
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
+#include <asm/vdso.h>
#include "signal-common.h"
@@ -44,47 +45,20 @@ extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
-/*
- * Horribly complicated - with the bloody RM9000 workarounds enabled
- * the signal trampolines is moving to the end of the structure so we can
- * increase the alignment without breaking software compatibility.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_code[2]; /* signal trampoline */
+ u32 sf_pad[2]; /* Was: signal trampoline */
struct sigcontext sf_sc;
sigset_t sf_mask;
};
struct rt_sigframe {
u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_code[2]; /* signal trampoline */
+ u32 rs_pad[2]; /* Was: signal trampoline */
struct siginfo rs_info;
struct ucontext rs_uc;
};
-#else
-
-struct sigframe {
- u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_pad[2];
- struct sigcontext sf_sc; /* hw context */
- sigset_t sf_mask;
- u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
-};
-
-struct rt_sigframe {
- u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_pad[2];
- struct siginfo rs_info;
- struct ucontext rs_uc;
- u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
-};
-
-#endif
-
/*
* Helper routines
*/
@@ -266,32 +240,6 @@ void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
}
-int install_sigtramp(unsigned int __user *tramp, unsigned int syscall)
-{
- int err;
-
- /*
- * Set up the return code ...
- *
- * li v0, __NR__foo_sigreturn
- * syscall
- */
-
- err = __put_user(0x24020000 + syscall, tramp + 0);
- err |= __put_user(0x0000000c , tramp + 1);
- if (ICACHE_REFILLS_WORKAROUND_WAR) {
- err |= __put_user(0, tramp + 2);
- err |= __put_user(0, tramp + 3);
- err |= __put_user(0, tramp + 4);
- err |= __put_user(0, tramp + 5);
- err |= __put_user(0, tramp + 6);
- err |= __put_user(0, tramp + 7);
- }
- flush_cache_sigtramp((unsigned long) tramp);
-
- return err;
-}
-
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
@@ -484,8 +432,8 @@ badframe:
}
#ifdef CONFIG_TRAD_SIGNALS
-static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set)
+static int setup_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set)
{
struct sigframe __user *frame;
int err = 0;
@@ -494,8 +442,6 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->sf_code, __NR_sigreturn);
-
err |= setup_sigcontext(regs, &frame->sf_sc);
err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
if (err)
@@ -515,7 +461,7 @@ static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = 0;
regs->regs[ 6] = (unsigned long) &frame->sf_sc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->sf_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -529,8 +475,9 @@ give_sigsegv:
}
#endif
-static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set,
+ siginfo_t *info)
{
struct rt_sigframe __user *frame;
int err = 0;
@@ -539,8 +486,6 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
-
/* Create siginfo. */
err |= copy_siginfo_to_user(&frame->rs_info, info);
@@ -573,7 +518,7 @@ static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = (unsigned long) &frame->rs_info;
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->rs_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -590,8 +535,11 @@ give_sigsegv:
struct mips_abi mips_abi = {
#ifdef CONFIG_TRAD_SIGNALS
.setup_frame = setup_frame,
+ .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
#endif
.setup_rt_frame = setup_rt_frame,
+ .rt_signal_return_offset =
+ offsetof(struct mips_vdso, rt_signal_trampoline),
.restart = __NR_restart_syscall
};
@@ -599,6 +547,8 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
int ret;
+ struct mips_abi *abi = current->thread.abi;
+ void *vdso = current->mm->context.vdso;
switch(regs->regs[0]) {
case ERESTART_RESTARTBLOCK:
@@ -619,9 +569,11 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
regs->regs[0] = 0; /* Don't deal with this again. */
if (sig_uses_siginfo(ka))
- ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
+ ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
+ ka, regs, sig, oldset, info);
else
- ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
+ ret = abi->setup_frame(vdso + abi->signal_return_offset,
+ ka, regs, sig, oldset);
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 03abaf048f0..a0ed0e052b2 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -32,6 +32,7 @@
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/war.h>
+#include <asm/vdso.h>
#include "signal-common.h"
@@ -47,8 +48,6 @@ extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user
/*
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
*/
-#define __NR_O32_sigreturn 4119
-#define __NR_O32_rt_sigreturn 4193
#define __NR_O32_restart_syscall 4253
/* 32-bit compatibility types */
@@ -77,47 +76,20 @@ struct ucontext32 {
compat_sigset_t uc_sigmask; /* mask last for extensibility */
};
-/*
- * Horribly complicated - with the bloody RM9000 workarounds enabled
- * the signal trampolines is moving to the end of the structure so we can
- * increase the alignment without breaking software compatibility.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
struct sigframe32 {
u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_code[2]; /* signal trampoline */
+ u32 sf_pad[2]; /* Was: signal trampoline */
struct sigcontext32 sf_sc;
compat_sigset_t sf_mask;
};
struct rt_sigframe32 {
u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_code[2]; /* signal trampoline */
+ u32 rs_pad[2]; /* Was: signal trampoline */
compat_siginfo_t rs_info;
struct ucontext32 rs_uc;
};
-#else /* ICACHE_REFILLS_WORKAROUND_WAR */
-
-struct sigframe32 {
- u32 sf_ass[4]; /* argument save space for o32 */
- u32 sf_pad[2];
- struct sigcontext32 sf_sc; /* hw context */
- compat_sigset_t sf_mask;
- u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
-};
-
-struct rt_sigframe32 {
- u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_pad[2];
- compat_siginfo_t rs_info;
- struct ucontext32 rs_uc;
- u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */
-};
-
-#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
-
/*
* sigcontext handlers
*/
@@ -598,8 +570,8 @@ badframe:
force_sig(SIGSEGV, current);
}
-static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set)
+static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set)
{
struct sigframe32 __user *frame;
int err = 0;
@@ -608,8 +580,6 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn);
-
err |= setup_sigcontext32(regs, &frame->sf_sc);
err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
@@ -630,7 +600,7 @@ static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = 0;
regs->regs[ 6] = (unsigned long) &frame->sf_sc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->sf_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -644,8 +614,9 @@ give_sigsegv:
return -EFAULT;
}
-static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
- int signr, sigset_t *set, siginfo_t *info)
+static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
+ struct pt_regs *regs, int signr, sigset_t *set,
+ siginfo_t *info)
{
struct rt_sigframe32 __user *frame;
int err = 0;
@@ -655,8 +626,6 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- err |= install_sigtramp(frame->rs_code, __NR_O32_rt_sigreturn);
-
/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
err |= copy_siginfo_to_user32(&frame->rs_info, info);
@@ -690,7 +659,7 @@ static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
regs->regs[ 5] = (unsigned long) &frame->rs_info;
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->rs_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -709,7 +678,11 @@ give_sigsegv:
*/
struct mips_abi mips_abi_32 = {
.setup_frame = setup_frame_32,
+ .signal_return_offset =
+ offsetof(struct mips_vdso, o32_signal_trampoline),
.setup_rt_frame = setup_rt_frame_32,
+ .rt_signal_return_offset =
+ offsetof(struct mips_vdso, o32_rt_signal_trampoline),
.restart = __NR_O32_restart_syscall
};
diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
index bb277e82d42..2c5df818c65 100644
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -39,13 +39,13 @@
#include <asm/fpu.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
+#include <asm/vdso.h>
#include "signal-common.h"
/*
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
*/
-#define __NR_N32_rt_sigreturn 6211
#define __NR_N32_restart_syscall 6214
extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
@@ -67,27 +67,13 @@ struct ucontextn32 {
compat_sigset_t uc_sigmask; /* mask last for extensibility */
};
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
-struct rt_sigframe_n32 {
- u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_code[2]; /* signal trampoline */
- struct compat_siginfo rs_info;
- struct ucontextn32 rs_uc;
-};
-
-#else /* ICACHE_REFILLS_WORKAROUND_WAR */
-
struct rt_sigframe_n32 {
u32 rs_ass[4]; /* argument save space for o32 */
- u32 rs_pad[2];
+ u32 rs_pad[2]; /* Was: signal trampoline */
struct compat_siginfo rs_info;
struct ucontextn32 rs_uc;
- u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
};
-#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
-
extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
@@ -173,7 +159,7 @@ badframe:
force_sig(SIGSEGV, current);
}
-static int setup_rt_frame_n32(struct k_sigaction * ka,
+static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka,
struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
{
struct rt_sigframe_n32 __user *frame;
@@ -184,8 +170,6 @@ static int setup_rt_frame_n32(struct k_sigaction * ka,
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto give_sigsegv;
- install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
-
/* Create siginfo. */
err |= copy_siginfo_to_user32(&frame->rs_info, info);
@@ -219,7 +203,7 @@ static int setup_rt_frame_n32(struct k_sigaction * ka,
regs->regs[ 5] = (unsigned long) &frame->rs_info;
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
regs->regs[29] = (unsigned long) frame;
- regs->regs[31] = (unsigned long) frame->rs_code;
+ regs->regs[31] = (unsigned long) sig_return;
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
@@ -235,5 +219,7 @@ give_sigsegv:
struct mips_abi mips_abi_n32 = {
.setup_rt_frame = setup_rt_frame_n32,
+ .rt_signal_return_offset =
+ offsetof(struct mips_vdso, n32_rt_signal_trampoline),
.restart = __NR_N32_restart_syscall
};
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 25e825aea32..a95dea5459c 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -182,7 +182,7 @@ static int vpemask[2][8] = {
{0, 0, 0, 0, 0, 0, 0, 1}
};
int tcnoprog[NR_CPUS];
-static atomic_t idle_hook_initialized = {0};
+static atomic_t idle_hook_initialized = ATOMIC_INIT(0);
static int clock_hang_reported[NR_CPUS];
#endif /* CONFIG_SMTC_IDLE_HOOK_DEBUG */
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 9587abc67f3..dd81b0f8751 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -79,7 +79,11 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
int do_color_align;
unsigned long task_size;
- task_size = STACK_TOP;
+#ifdef CONFIG_32BIT
+ task_size = TASK_SIZE;
+#else /* Must be CONFIG_64BIT*/
+ task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
+#endif
if (len > task_size)
return -ENOMEM;
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 4e00f9bc23e..1a4dd657ccb 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1599,7 +1599,7 @@ void __init trap_init(void)
ebase = (unsigned long)
__alloc_bootmem(size, 1 << fls(size), 0);
} else {
- ebase = CAC_BASE;
+ ebase = CKSEG0;
if (cpu_has_mips_r2)
ebase += (read_c0_ebase() & 0x3ffff000);
}
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
new file mode 100644
index 00000000000..b773c1112b1
--- /dev/null
+++ b/arch/mips/kernel/vdso.c
@@ -0,0 +1,112 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009, 2010 Cavium Networks, Inc.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/binfmts.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/unistd.h>
+
+#include <asm/vdso.h>
+#include <asm/uasm.h>
+
+/*
+ * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
+ */
+#define __NR_O32_sigreturn 4119
+#define __NR_O32_rt_sigreturn 4193
+#define __NR_N32_rt_sigreturn 6211
+
+static struct page *vdso_page;
+
+static void __init install_trampoline(u32 *tramp, unsigned int sigreturn)
+{
+ uasm_i_addiu(&tramp, 2, 0, sigreturn); /* li v0, sigreturn */
+ uasm_i_syscall(&tramp, 0);
+}
+
+static int __init init_vdso(void)
+{
+ struct mips_vdso *vdso;
+
+ vdso_page = alloc_page(GFP_KERNEL);
+ if (!vdso_page)
+ panic("Cannot allocate vdso");
+
+ vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL);
+ if (!vdso)
+ panic("Cannot map vdso");
+ clear_page(vdso);
+
+ install_trampoline(vdso->rt_signal_trampoline, __NR_rt_sigreturn);
+#ifdef CONFIG_32BIT
+ install_trampoline(vdso->signal_trampoline, __NR_sigreturn);
+#else
+ install_trampoline(vdso->n32_rt_signal_trampoline,
+ __NR_N32_rt_sigreturn);
+ install_trampoline(vdso->o32_signal_trampoline, __NR_O32_sigreturn);
+ install_trampoline(vdso->o32_rt_signal_trampoline,
+ __NR_O32_rt_sigreturn);
+#endif
+
+ vunmap(vdso);
+
+ pr_notice("init_vdso successfull\n");
+
+ return 0;
+}
+device_initcall(init_vdso);
+
+static unsigned long vdso_addr(unsigned long start)
+{
+ return STACK_TOP;
+}
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ int ret;
+ unsigned long addr;
+ struct mm_struct *mm = current->mm;
+
+ down_write(&mm->mmap_sem);
+
+ addr = vdso_addr(mm->start_stack);
+
+ addr = get_unmapped_area(NULL, addr, PAGE_SIZE, 0, 0);
+ if (IS_ERR_VALUE(addr)) {
+ ret = addr;
+ goto up_fail;
+ }
+
+ ret = install_special_mapping(mm, addr, PAGE_SIZE,
+ VM_READ|VM_EXEC|
+ VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
+ VM_ALWAYSDUMP,
+ &vdso_page);
+
+ if (ret)
+ goto up_fail;
+
+ mm->context.vdso = (void *)addr;
+
+up_fail:
+ up_write(&mm->mmap_sem);
+ return ret;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
+ return "[vdso]";
+ return NULL;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 17:55:14 +0000