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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@windriver.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
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@ -103,6 +103,7 @@
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#include <linux/delay.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/module.h>
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#include <asm/sections.h>
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#define v1printk(a...) do { \
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#define v1printk(a...) do { \
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if (verbose) \
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if (verbose) \
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@ -222,6 +223,7 @@ static unsigned long lookup_addr(char *arg)
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addr = (unsigned long)do_fork;
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addr = (unsigned long)do_fork;
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else if (!strcmp(arg, "hw_break_val"))
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else if (!strcmp(arg, "hw_break_val"))
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addr = (unsigned long)&hw_break_val;
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addr = (unsigned long)&hw_break_val;
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addr = (unsigned long) dereference_function_descriptor((void *)addr);
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return addr;
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return addr;
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}
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}
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