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linux-user: Load symbols from the interpreter.
First, adjust load_symbols to accept a load_bias parameter. At the same
time, read the entire section header table in one go, use pread instead
f lseek+read for the symbol and string tables, and properly free
allocated structures on error exit paths.
Second, adjust load_elf_interp to compute load_bias. This requires
finding out the built-in load addresses. Which allows us to honor a
pre-linked interpreter image when possible, and eliminate the hard-coded
INTERP_MAP_SIZE value.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>