Messages in this thread Patch in this message | | | From | Tiejun Chen <> | Subject | [v2][PATCH 6/6] kgdb/kgdbts: support ppc64 | Date | Mon, 21 Jan 2013 15:44:15 +0800 |
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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@windriver.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
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