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adi(3c)
Standard C Library Functions adi(3C)
NAME
adi, adi_clr_version, adi_get_version, adi_set_version, adi_memset,
adi_get_precise, adi_set_precise - Application Data Integrity opera‐
tions
SYNOPSIS
#include <sys/types.h>
#include <adi.h>
caddr_t adi_clr_version(caddr_t addr, size_t size);
int adi_get_version(caddr_t addr);
caddr_t adi_set_version(caddr_t addr, size_t size, int version);
caddr_t adi_memset(caddr_t addr, int c, size_t size, int version);
int adi_get_precise(void);
int adi_set_precise(int mode);
OVERVIEW
Application Data Integrity (ADI) is a SPARC hardware feature that
detects invalid memory accesses in 64-bit software. See the adi(7) man
page for additional information on the ADI feature.
DESCRIPTION
The following C Library functions provide the ADI API to 64-bit appli‐
cations:
o The adi_clr_version() function clears (sets to 0) all ADI
version tags for the specified range of ADI-enabled memory.
Load and store instructions that reference a memory location
with a clear ADI version will not cause a mismatch excep‐
tion.
o The adi_get_version() function returns the ADI version for a
memory address assigned to a region of ADI-enabled memory.
o The adi_set_version() function sets the ADI version tags to
a specified version for a specified range of ADI-enabled
memory.
o The adi_memset() function sets the bytes in an ADI-enabled
memory range to the value of c (converted to an unsigned
char) and sets the ADI version tags of the memory range to
the specified version number. Calling the adi_memset() func‐
tion is more efficient than calling the memset() and the
adi_set_version() functions separately.
o The adi_get_precise() function returns the current state of
the ADI precise exception mode for the calling thread.
o The adi_set_precise() function sets the current state of the
ADI precise exception mode for the calling thread. The value
of mode can either be ADI_PRECISE_ENABLE or ADI_PRECISE_DIS‐
ABLE.
RETURN VALUES
On success, the adi_clr_version() function returns a non-versioned
address pointer to the specified memory. Otherwise, the function
returns the value (caddr_t)-1 and sets errno to indicate the error.
On success, the adi_get_version() function returns the ADI version tag
value for the specified address. Otherwise, the function returns the
value -1 and sets errno to indicate the error.
On success, the adi_set_version() and the adi_memset() functions return
a versioned address pointer to the specified memory. Otherwise, the
functions return the value (caddr_t)-1 and set errno to indicate the
error.
On success, the adi_get_precise() function returns the value ADI_PRE‐
CISE_DISABLE or ADI_PRECISE_ENABLE, to indicate the current state of
ADI precise exception mode. Otherwise, the function returns the value
-1 and sets errno to indicate the error.
On success, the adi_set_precise() function returns the value ADI_PRE‐
CISE_DISABLE or ADI_PRECISE_ENABLE, to indicate the previous state of
ADI precise exception mode. Otherwise, the function returns the value
-1 and sets errno to indicate the error.
ERRORS
The ADI libc library calls will fail if:
ENOTSUP
o ADI is not supported by the platform.
o ADI is not supported for 32-bit processes.
EINVAL The version argument is greater than the maximum version
value returned by the adi_version_max(2) function.
The precise exception mode value specified is not ADI_PRE‐
CISE_ENABLE or ADI_PRECISE_DISABLE.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityVolatile _ MT-LevelMT-Safe
SEE ALSO
adi(2), siginfo.h(3HEAD), attributes(7), standards(7)
WARNINGS
If you try to set or clear versions on memory that are not ADI-enabled,
you may receive a SIGSEGV signal with an si_code equal to SEGV_ACCADI.
You can set or clear versions on memory more efficiently if you align
the address and size arguments to the ADI versioning block size as
returned by adi_blksz(2).
Do not attempt pointer arithmetic between versioned data pointers that
might have different versions.
Use only non-versioned addresses when providing user addresses to the
kernel as data not intended to be used for kernel copyin()/copyout() or
I/O.
A thread that explicitly disables ADI by calling the adi_set_enabled()
function must access ADI-enabled memory using normalized addresses.
Be careful when you write to ADI-enabled memory from a thread that is
not ADI-enabled. When ADI checking is disabled, executing block store
and block initializing store instructions might clear the version
assigned to the target memory address. Library functions such as, but
not limited to bzero(3C), memset(3C), and memcpy(3C) may use block ini‐
tializing store instructions.
Under certain conditions, a read() operation that uses direct I/O
enabled through the directio(3C) function might reset the versions in
the buffer to zero. In such cases, the application software should
check the version at the beginning of the buffer, and if the version is
zero, the software should restore the version of the entire buffer.
On some processors, the way version bits are implemented does not guar‐
antee the preservation of the version bits when certain processor-spe‐
cific RAS (reliability, availability, and serviceability) features are
invoked. If the version bits are corrupted, a subsequent load or store
of the affected cacheline generates a version mismatch. If the version
mismatch results in a SIGSEGV signal with an si_code equal to
SEGV_ADIPERR, then the si_adivers value will be set to -1 to indicate
that the original version is lost.
NOTES
When a versioned data pointer is provided to the kernel as a target for
a copyin() or copyout() function or to an I/O operation such as an
operation through a read(2) or write(2) function, the kernel will
assume that the version applies to the whole buffer. If there is an ADI
mismatch exception while the kernel is executing the operation, the
operation will fail gracefully and where possible errno will be set to
EADI. Because the copyin(9F)/ddi_copyin(9F) and copyout(9F)/ddi_copy‐
out(9F) functions return -1 on all kinds of failure, system calls that
fail due to an ADI mismatch exception during calls to these functions
cannot differentiate the failure from the other ways in which these
functions can fail. In such cases errno will be set to EFAULT.
Oracle Solaris 11.4 2 Feb 2019 adi(3C)