diff options
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/Kconfig.i386 | 58 | ||||
| -rw-r--r-- | arch/um/sys-i386/signal.c | 3 | ||||
| -rw-r--r-- | arch/um/sys-x86_64/signal.c | 5 |
3 files changed, 34 insertions, 32 deletions
diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386 index f191a55..d6cffb2 100644 --- a/arch/um/Kconfig.i386 +++ b/arch/um/Kconfig.i386 @@ -19,31 +19,31 @@ config SEMAPHORE_SLEEPERS choice prompt "Host memory split" default HOST_VMSPLIT_3G - ---help--- - This is needed when the host kernel on which you run has a non-default - (like 2G/2G) memory split, instead of the customary 3G/1G. If you did - not recompile your own kernel but use the default distro's one, you can - safely accept the "Default split" option. - - It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via - CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck - patchset by Con Kolivas, or other ones) - option names match closely the - host CONFIG_VM_SPLIT_* ones. - - A lower setting (where 1G/3G is lowest and 3G/1G is higher) will - tolerate even more "normal" host kernels, but an higher setting will be - stricter. - - So, if you do not know what to do here, say 'Default split'. - - config HOST_VMSPLIT_3G - bool "Default split (3G/1G user/kernel host split)" - config HOST_VMSPLIT_3G_OPT - bool "3G/1G user/kernel host split (for full 1G low memory)" - config HOST_VMSPLIT_2G - bool "2G/2G user/kernel host split" - config HOST_VMSPLIT_1G - bool "1G/3G user/kernel host split" + help + This is needed when the host kernel on which you run has a non-default + (like 2G/2G) memory split, instead of the customary 3G/1G. If you did + not recompile your own kernel but use the default distro's one, you can + safely accept the "Default split" option. + + It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via + CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck + patchset by Con Kolivas, or other ones) - option names match closely the + host CONFIG_VM_SPLIT_* ones. + + A lower setting (where 1G/3G is lowest and 3G/1G is higher) will + tolerate even more "normal" host kernels, but an higher setting will be + stricter. + + So, if you do not know what to do here, say 'Default split'. + +config HOST_VMSPLIT_3G + bool "Default split (3G/1G user/kernel host split)" +config HOST_VMSPLIT_3G_OPT + bool "3G/1G user/kernel host split (for full 1G low memory)" +config HOST_VMSPLIT_2G + bool "2G/2G user/kernel host split" +config HOST_VMSPLIT_1G + bool "1G/3G user/kernel host split" endchoice config TOP_ADDR @@ -67,13 +67,13 @@ config 3_LEVEL_PGTABLES config STUB_CODE hex - default 0xbfffe000 if !HOST_2G_2G - default 0x7fffe000 if HOST_2G_2G + default 0xbfffe000 if !HOST_VMSPLIT_2G + default 0x7fffe000 if HOST_VMSPLIT_2G config STUB_DATA hex - default 0xbffff000 if !HOST_2G_2G - default 0x7ffff000 if HOST_2G_2G + default 0xbffff000 if !HOST_VMSPLIT_2G + default 0x7ffff000 if HOST_VMSPLIT_2G config STUB_START hex diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c index 0709fc6..3f6acd6 100644 --- a/arch/um/sys-i386/signal.c +++ b/arch/um/sys-i386/signal.c @@ -219,7 +219,8 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig, unsigned long save_sp = PT_REGS_SP(regs); int err = 0; - stack_top &= -8UL; + /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ + stack_top = ((stack_top + 4) & -16UL) - 4; frame = (struct sigframe __user *) stack_top - 1; if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) return 1; diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c index 9edf114..af2f017 100644 --- a/arch/um/sys-x86_64/signal.c +++ b/arch/um/sys-x86_64/signal.c @@ -191,8 +191,9 @@ int setup_signal_stack_si(unsigned long stack_top, int sig, struct task_struct *me = current; frame = (struct rt_sigframe __user *) - round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8; - frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128); + round_down(stack_top - sizeof(struct rt_sigframe), 16); + /* Subtract 128 for a red zone and 8 for proper alignment */ + frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8); if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate))) goto out; |
