clayborg added a comment.
GDB remote protocol specifies that register values are sent in target byte
order. We shouldn't change this. A big endian system should not send things as
little endian. That being said, the current register context assumes you have a
buffer that can contain all registers and that buffer is encoded using the byte
order that is specified in the DataExtractor.
It is also quite silly that the MIPS register context is reading all registers
from the ptrace wrapper just to get one single register. RegisterContextDarwin
reads all GPRs in a single call and marks all of them valid at once and then
extracting a register goes something like:
if (RegisterIsGPR(value.info))
{
ReadGPRsIfWeAlreadyHavent();
// Extract register from buffer.
}
else if (RegiserIsFPU(value.info))
{
ReadFPUsIfWeAlreadyHavent();
// Extract register from buffer.
}
etc..
Repository:
rL LLVM
http://reviews.llvm.org/D14633
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