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authorMike Dunn <mikedunn@newsguy.com>2010-04-21 13:40:51 -0400
committerØyvind Harboe <oyvind.harboe@zylin.com>2010-04-24 16:54:36 +0200
commit4f1296d1510715b5504f39909dadae79698aa27a (patch)
tree47b48eee1ba99799f8e06eb71bb0d85a2999714f /tcl
parentc6cd253ae105a9542f051d4af3fda7e9a1c7140b (diff)
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xscale: add support for length arg to wp command
This patch adds support for the length argument to the xscale implementation of the wp command. Per discussion with David, the length argument specifies the range of addresses over which a memory access should generate a debug exception. This patch utilizes the "mask" feature of the xscale debug hardware to implement the correct functionality of the length argument. Some limitations imposed by the hardware are: - The length must be a power of two, with a minumum of 4. - Two data breakpoint registers are available, allowing for two watchpoints. However, if the length of a watchpoint is greater than four, both registers are used (the second for a mask value), limiting the number of watchpoints to one. This patch also removes a useless call to xscale_get_reg(dbcon) in xscale_set_watchpoint() (value had already been read from the register cache, and the same previously read value is then modified and written back). I have been using and testing this patch for a couple days. Questions, corrections, criticisms of course gratefully received.
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