diff options
Diffstat (limited to 'gdb/infptrace.c')
| -rw-r--r-- | gdb/infptrace.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gdb/infptrace.c b/gdb/infptrace.c index 777a5b491ed..601e157c8ef 100644 --- a/gdb/infptrace.c +++ b/gdb/infptrace.c @@ -514,6 +514,37 @@ child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, PTRACE_XFER_TYPE *buffer; struct cleanup *old_chain = NULL; +#ifdef PT_IO + /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request + that promises to be much more efficient in reading and writing + data in the traced process's address space. */ + + { + struct ptrace_io_desc piod; + + /* NOTE: We assume that there are no distinct address spaces for + instruction and data. */ + piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; + piod.piod_offs = (void *) memaddr; + piod.piod_addr = myaddr; + piod.piod_len = len; + + if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1) + { + /* If the PT_IO request is somehow not supported, fallback on + using PT_WRITE_D/PT_READ_D. Otherwise we will return zero + to indicate failure. */ + if (errno != EINVAL) + return 0; + } + else + { + /* Return the actual number of bytes read or written. */ + return piod.piod_len; + } + } +#endif + /* Allocate buffer of that many longwords. */ if (len < GDB_MAX_ALLOCA) { |