http://article.gmane.org/gmane.linux.kernel.debugging.kgdb.bugs/3121 From: Jason Wessel <jason.wessel <at> windriver.com> Subject: [PATCH 7/7] kgdb: Make mem access function weak in kgdb.c andkgdb.h Newsgroups: gmane.linux.kernel.debugging.kgdb.bugs, gmane.linux.kernel Date: 2008-10-21 19:14:53 GMT (1 day, 11 hours and 31 minutes ago) From: Sonic Zhang <sonic.adi <at> 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 <at> gmail.com> Signed-off-by: Jason Wessel <jason.wessel <at> windriver.com> --- include/linux/kgdb.h | 42 ++++++++++++++++++++++++++++++++++++++++-- kernel/kgdb.c | 6 +++--- 2 files changed, 43 insertions(+), 5 deletions(-) diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index 8fdd3cb..3df90af 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/kgdb.c b/kernel/kgdb.c index d7a30bb..e9e0e8a 100644 --- a/kernel/kgdb.c +++ b/kernel/kgdb.c @@ -365,7 +365,7 @@ static void put_packet(char *buffer) * Convert the memory pointed to by mem into hex, placing result in 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; @@ -395,7 +395,7 @@ int kgdb_mem2hex(char *mem, char *buf, int count) * 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; @@ -420,7 +420,7 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count) * 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; -- 1.6.0.2 |