Messages in this thread Patch in this message | | | From | Jason Wessel <> | Subject | [PATCH 10/37] kgdb: Make mem access function weak in kgdb.c and kgdb.h | Date | Wed, 23 Dec 2009 15:19:23 -0600 |
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From: Sonic Zhang <sonic.adi@gmail.com>
L1 instruction memory and MMR memory on blackfin can not be accessed by common functions probe_kernel_read() and probe_kernel_write(). Blackfin asks for 2/4 byte align access to MMR memory and DMA access to L1 instruction memory. These functions need to be reimplemented in architecture specific kgdb.c. Update documentation and prototypes as well.
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com> --- include/linux/kgdb.h | 42 ++++++++++++++++++++++++++++++++++++++++-- kernel/debug/gdbstub.c | 6 +++--- 2 files changed, 43 insertions(+), 5 deletions(-)
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index 6adcc29..4247950 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -267,8 +267,46 @@ extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops); extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops); extern int kgdb_hex2long(char **ptr, unsigned long *long_val); -extern int kgdb_mem2hex(char *mem, char *buf, int count); -extern int kgdb_hex2mem(char *buf, char *mem, int count); + +/** + * kgdb_mem2hex - (optional arch override) translate bin to hex chars + * @mem: source buffer + * @buf: target buffer + * @count: number of bytes in mem + * + * Architectures which do not support probe_kernel_(read|write), + * can make an alternate implementation of this function. + * This function safely reads memory into hex + * characters for use with the kgdb protocol. + */ +extern int __weak kgdb_mem2hex(char *mem, char *buf, int count); + +/** + * kgdb_hex2mem - (optional arch override) translate hex chars to bin + * @buf: source buffer + * @mem: target buffer + * @count: number of bytes in mem + * + * Architectures which do not support probe_kernel_(read|write), + * can make an alternate implementation of this function. + * This function safely writes hex characters into memory + * for use with the kgdb protocol. + */ +extern int __weak kgdb_hex2mem(char *buf, char *mem, int count); + +/** + * kgdb_ebin2mem - (optional arch override) Copy the binary array + * pointed to by buf into mem. + * @buf: source buffer + * @mem: target buffer + * @count: number of bytes in mem + * + * Architectures which do not support probe_kernel_(read|write), + * can make an alternate implementation of this function. + * This function safely copies binary array into memory + * for use with the kgdb protocol. + */ +extern int __weak kgdb_ebin2mem(char *buf, char *mem, int count); extern int kgdb_isremovedbreak(unsigned long addr); diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c index ab29bce..bae83cc 100644 --- a/kernel/debug/gdbstub.c +++ b/kernel/debug/gdbstub.c @@ -208,7 +208,7 @@ void gdbstub_msg_write(const char *s, int len) * buf. Return a pointer to the last char put in buf (null). May * return an error. */ -int kgdb_mem2hex(char *mem, char *buf, int count) +int __weak kgdb_mem2hex(char *mem, char *buf, int count) { char *tmp; int err; @@ -238,7 +238,7 @@ int kgdb_mem2hex(char *mem, char *buf, int count) * mem. Return a pointer to the character AFTER the last byte * written. May return an error. */ -int kgdb_hex2mem(char *buf, char *mem, int count) +int __weak kgdb_hex2mem(char *buf, char *mem, int count) { char *tmp_raw; char *tmp_hex; @@ -296,7 +296,7 @@ int kgdb_hex2long(char **ptr, unsigned long *long_val) * 0x7d escaped with 0x7d. Return a pointer to the character after * the last byte written. */ -static int kgdb_ebin2mem(char *buf, char *mem, int count) +int __weak kgdb_ebin2mem(char *buf, char *mem, int count) { int err = 0; char c; -- 1.6.4.rc1
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