diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sh/Kconfig.debug | 16 | ||||
| -rw-r--r-- | arch/sh/kernel/head.S | 4 | ||||
| -rw-r--r-- | arch/sh/kernel/irq.c | 17 | ||||
| -rw-r--r-- | arch/sh/kernel/vmlinux.lds.S | 14 |
4 files changed, 43 insertions, 8 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug index 75ed1be8a49..f0188e626be 100644 --- a/arch/sh/Kconfig.debug +++ b/arch/sh/Kconfig.debug @@ -30,6 +30,22 @@ config EARLY_PRINTK when the kernel may crash or hang before the serial console is initialised. If unsure, say N. +config DEBUG_STACKOVERFLOW + bool "Check for stack overflows" + depends on DEBUG_KERNEL + help + This option will cause messages to be printed if free stack space + drops below a certain limit. + +config DEBUG_STACK_USAGE + bool "Stack utilization instrumentation" + depends on DEBUG_KERNEL + help + Enables the display of the minimum amount of free stack which each + task has ever had available in the sysrq-T and sysrq-P debug output. + + This option will slow down process creation somewhat. + config KGDB bool "Include KGDB kernel debugger" select FRAME_POINTER diff --git a/arch/sh/kernel/head.S b/arch/sh/kernel/head.S index c5e363872b9..3e7d00b7985 100644 --- a/arch/sh/kernel/head.S +++ b/arch/sh/kernel/head.S @@ -11,6 +11,8 @@ * Head.S contains the SH exception handlers and startup code. */ #include <linux/linkage.h> +#include <asm/thread_info.h> +#include <asm/page.h> #ifdef CONFIG_CPU_SH4A #define SYNCO() synco @@ -95,7 +97,7 @@ ENTRY(_stext) .balign 4 1: .long 0x400080F0 ! MD=1, RB=0, BL=0, FD=1, IMASK=0xF -2: .long init_thread_union+8192 +2: .long init_thread_union+THREAD_SIZE 3: .long __bss_start 4: .long _end 5: .long start_kernel diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c index c2e07f7f349..7066611aeb7 100644 --- a/arch/sh/kernel/irq.c +++ b/arch/sh/kernel/irq.c @@ -60,7 +60,6 @@ unlock: } #endif - asmlinkage int do_IRQ(unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7, struct pt_regs regs) @@ -69,6 +68,22 @@ asmlinkage int do_IRQ(unsigned long r4, unsigned long r5, irq_enter(); +#ifdef CONFIG_DEBUG_STACKOVERFLOW + /* Debugging check for stack overflow: is there less than 1KB free? */ + { + long sp; + + __asm__ __volatile__ ("and r15, %0" : + "=r" (sp) : "0" (THREAD_SIZE - 1)); + + if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { + printk("do_IRQ: stack overflow: %ld\n", + sp - sizeof(struct thread_info)); + dump_stack(); + } + } +#endif + #ifdef CONFIG_CPU_HAS_INTEVT __asm__ __volatile__ ( #ifdef CONFIG_CPU_HAS_SR_RB diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S index eb860c51c69..0220d8a838a 100644 --- a/arch/sh/kernel/vmlinux.lds.S +++ b/arch/sh/kernel/vmlinux.lds.S @@ -2,6 +2,8 @@ * ld script to make SuperH Linux kernel * Written by Niibe Yutaka */ +#include <asm/thread_info.h> +#include <asm/page.h> #include <asm-generic/vmlinux.lds.h> #ifdef CONFIG_CPU_LITTLE_ENDIAN @@ -40,16 +42,16 @@ SECTIONS *(.data) /* Align the initial ramdisk image (INITRD) on page boundaries. */ - . = ALIGN(4096); + . = ALIGN(PAGE_SIZE); __rd_start = .; *(.initrd) - . = ALIGN(4096); + . = ALIGN(PAGE_SIZE); __rd_end = .; CONSTRUCTORS } - . = ALIGN(4096); + . = ALIGN(PAGE_SIZE); .data.page_aligned : { *(.data.idt) } . = ALIGN(32); @@ -60,10 +62,10 @@ SECTIONS _edata = .; /* End of data section */ - . = ALIGN(8192); /* init_task */ + . = ALIGN(THREAD_SIZE); /* init_task */ .data.init_task : { *(.data.init_task) } - . = ALIGN(4096); /* Init code and data */ + . = ALIGN(PAGE_SIZE); /* Init code and data */ __init_begin = .; _sinittext = .; .init.text : { *(.init.text) } @@ -94,7 +96,7 @@ SECTIONS __machvec_start = .; .init.machvec : { *(.init.machvec) } __machvec_end = .; - . = ALIGN(4096); + . = ALIGN(PAGE_SIZE); __init_end = .; . = ALIGN(4); |