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Date: Thu, 25 Oct 2012 14:43:30 +0800 From: Tiejun Chen <tiejun.chen@...driver.com> To: <benh@...nel.crashing.org> CC: <jason.wessel@...driver.com>, <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH 3/3] kgdb/kgdbts: support ppc64 We can't look up the address of the entry point of the function simply via that function symbol for all architectures. For PPC64 ABI, actually there is a function descriptors structure. A function descriptor is a three doubleword data structure that contains the following values: * The first doubleword contains the address of the entry point of the function. * The second doubleword contains the TOC base address for the function. * The third doubleword contains the environment pointer for languages such as Pascal and PL/1. So we should call a wapperred dereference_function_descriptor() to get the address of the entry point of the function. Note this is also safe for other architecture after refer to "include/asm-generic/sections.h" since: dereference_function_descriptor(p) always is (p) if without arched definition. Signed-off-by: Tiejun Chen <tiejun.chen@...driver.com> --- drivers/misc/kgdbts.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c index 3aa9a96..4799e1f 100644 --- a/drivers/misc/kgdbts.c +++ b/drivers/misc/kgdbts.c @@ -103,6 +103,7 @@ #include <linux/delay.h> #include <linux/kthread.h> #include <linux/module.h> +#include <asm/sections.h> #define v1printk(a...) do { \ if (verbose) \ @@ -222,6 +223,7 @@ static unsigned long lookup_addr(char *arg) addr = (unsigned long)do_fork; else if (!strcmp(arg, "hw_break_val")) addr = (unsigned long)&hw_break_val; + addr = (unsigned long )dereference_function_descriptor((void *)addr); return addr; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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