READ_ZSREG(9) Internal Functions READ_ZSREG(9)NAME
read_zsreg - Read a register from a Z85230
u8 read_zsreg(struct z8530_channel * c, u8 reg);
Z8530 channel to read from (2 per chip)
Register to read
Use a spinlock.
Most of the Z8530 registers are indexed off the control registers. A read is done by writing to the control register and reading the
register back. The caller must hold the lock
Alan Cox <email@example.com>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 READ_ZSREG(9)
Check Out this Related Man Page
UNW_SET_REG(3) Programming Library UNW_SET_REG(3)NAME
unw_set_reg -- set register contents
int unw_set_reg(unw_cursor_t *cp, unw_regnum_t reg, unw_word_t val);
The unw_set_reg() routine sets the value of register reg in the stack frame identified by cursor cp to the value passed in val.
The register numbering is target-dependent and described in separate manual pages (e.g., libunwind-ia64(3) for the IA-64 target). Further-
more, the exact set of accessible registers may depend on the type of frame that cp is referring to. For ordinary stack frames, it is nor-
mally possible to access only the preserved (``callee-saved'') registers and frame-related registers (such as the stack-pointer). However,
for signal frames (see unw_is_signal_frame(3)), it is usually possible to access all registers.
Note that unw_set_reg() can only write the contents of registers whose values fit in a single word. See unw_set_fpreg(3) for a way to write
registers which do not fit this constraint.
On successful completion, unw_set_reg() returns 0. Otherwise the negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_set_reg() is thread-safe as well as safe to use from a signal handler.
An unspecified error occurred.
An attempt was made to write a register that is either invalid or not accessible in the current frame.
An attempt was made to write to a read-only register.
In addition, unw_set_reg() may return any error returned by the access_mem(), access_reg(), and access_fpreg() call-backs (see unw_cre-
SEE ALSO libunwind(3), libunwind-ia64(3), unw_get_reg(3), unw_is_signal_frame(3), unw_set_fpreg(3)AUTHOR
Programming Library 16 August 2007 UNW_SET_REG(3)
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