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15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
usr/src/uts/common/fs/proc/prcontrol.c
usr/src/uts/intel/os/archdep.c
usr/src/uts/intel/sys/ucontext.h
usr/src/uts/intel/syscall/getcontext.c
*** 1,69 ****
MAKECONTEXT(3C) Standard C Library Functions MAKECONTEXT(3C)
NAME
! makecontext, swapcontext - manipulate user contexts
SYNOPSIS
#include <ucontext.h>
! void makecontext(ucontext_t *ucp, void (*func)(), int argc...);
! int swapcontext(ucontext_t *restrict oucp,
const ucontext_t *restrict ucp);
-
DESCRIPTION
The makecontext() function modifies the context specified by ucp, which
! has been initialized using getcontext(2). When this context is resumed
! using swapcontext() or setcontext(2), execution continues by calling
! the function func, passing it the arguments that follow argc in the
! makecontext() call. The value of argc must match the number of pointer-
! sized integer arguments passed to func, otherwise the behavior is
! undefined.
! Before a call is made to makecontext(), the context being modified
! should have a stack allocated for it. The stack is assigned to the
! context by initializing the uc_stack member.
-
- The uc_link member is used to determine the context that will be
- resumed when the context being modified by makecontext() returns. The
- uc_link member should be initialized prior to the call to
- makecontext(). If the uc_link member is initialized to NULL, the thread
- executing func will exit when func returns. See pthread_exit(3C).
-
-
The swapcontext() function saves the current context in the context
structure pointed to by oucp and sets the context to the context
structure pointed to by ucp.
! If the ucp or oucp argument points to an invalid address, the behavior
! is undefined and errno may be set to EFAULT.
RETURN VALUES
! On successful completion, swapcontext() returns 0. Otherwise, -1 is
! returned and errno is set to indicate the error.
- ERRORS
- The swapcontext() function will fail if:
-
- ENOMEM
- The ucp argument does not have enough stack left to complete
- the operation.
-
-
-
- The swapcontext() function may fail if:
-
- EFAULT
- The ucp or oucp argument points to an invalid address.
-
-
EXAMPLES
Example 1 Alternate execution context on a stack whose memory was
allocated using mmap().
#include <stdio.h>
--- 1,61 ----
MAKECONTEXT(3C) Standard C Library Functions MAKECONTEXT(3C)
NAME
! makecontext, swapcontext, swapcontext_extd - manipulate user contexts
SYNOPSIS
#include <ucontext.h>
! void
! makecontext(ucontext_t *ucp, void (*ifunc)(), int argc, ...);
+ int
+ swapcontext(ucontext_t *restrict oucp, const ucontext_t *restrict ucp);
! int
! swapcontext_extd(ucontext_t *restrict oucp, uint32_t flags,
const ucontext_t *restrict ucp);
DESCRIPTION
The makecontext() function modifies the context specified by ucp, which
! has been initialized using getcontext(2) or getcontext_extd(2). When
! this context is resumed using swapcontext(), swapcontext_extd(), or
! setcontext(2), execution continues by calling the function func, passing
! it the arguments that follow argc in the makecontext() call. The value
! of argc must match the number of pointer-sized integer arguments passed
! to func, otherwise the behavior is undefined.
+ Before a call is made to makecontext(), the context being modified should
+ have a stack allocated for it. The stack is assigned to the context by
+ initializing the uc_stack member.
! The uc_link member is used to determine the context that will be resumed
! when the context being modified by makecontext() returns. The uc_link
! member should be initialized prior to the call to makecontext(). If the
! uc_link member is initialized to NULL, the thread executing func will
! exit when func returns. See pthread_exit(3C).
The swapcontext() function saves the current context in the context
structure pointed to by oucp and sets the context to the context
structure pointed to by ucp.
+ If the ucp or oucp argument points to an invalid address, the behavior is
+ undefined and errno may be set to EFAULT.
! The swapcontext_extd() function is similar to swapcontext() except that
! it performs a call to getcontext_extd(2) to get and save the current
! context, passing the flags argument to getcontext_extd(2). Note, the
! same constraints around the initialization of the ucontext_t that are
! discussed in getcontext_extd(2) still apply. Mainly, the context must
! either have originally come from ucontext_alloc(3C) or prior to its first
! use been zeroed. See getcontext_extd(2) for more information.
RETURN VALUES
! On successful completion, swapcontext() and swapcontext_extd() return 0.
! Otherwise, -1 is returned and errno is set to indicate the error.
EXAMPLES
Example 1 Alternate execution context on a stack whose memory was
allocated using mmap().
#include <stdio.h>
*** 99,147 ****
printf("done %d\n", value);
return (0);
}
! USAGE
! These functions are useful for implementing user-level context
! switching between multiple threads of control within a process (co-
! processing). More effective multiple threads of control can be obtained
! by using native support for multithreading. See threads(7).
! ATTRIBUTES
! See attributes(7) for descriptions of the following attributes:
! +--------------------+-----------------+
! | ATTRIBUTE TYPE | ATTRIBUTE VALUE |
! +--------------------+-----------------+
! |Interface Stability | Standard |
! +--------------------+-----------------+
! |MT-Level | MT-Safe |
! +--------------------+-----------------+
SEE ALSO
! getcontext(2), mmap(2), sigaction(2), sigprocmask(2), pthread_exit(3C),
! ucontext.h(3HEAD), attributes(7), standards(7), threads(7)
NOTES
The semantics of the uc_stack member of the ucontext_t structure have
changed as they apply to inputs to makecontext(). Prior to Solaris 10,
! the ss_sp member of the uc_stack structure represented the high memory
address of the area reserved for the stack. The ss_sp member now
represents the base (low memory address), in keeping with other uses of
! ss_sp.
-
- This change in the meaning of ss_sp is now the default behavior. The
- -D__MAKECONTEXT_V2_SOURCE compilation flag used in Solaris 9 update
- releases to access this behavior is obsolete.
-
-
Binary compatibility has been preserved with releases prior to Solaris
10. Before recompiling, applications that use makecontext() must be
updated to reflect this behavior change. The example below demonstrates
a typical change that must be applied:
--- 91,139 ----
printf("done %d\n", value);
return (0);
}
+ ERRORS
+ The swapcontext() and swapcontext_extd() function will fail if:
! ENOMEM The ucp argument does not have enough stack left to
! complete the operation.
! The swapcontext() and swapcontext_extd() functions may fail if:
+ EFAULT The ucp or oucp argument points to an invalid address.
+ The swapcontext_extd() function may additionally fail if:
+ EINVAL The flags argument contains invalid values.
! USAGE
! These functions are useful for implementing user-level context switching
! between multiple threads of control within a process (co-processing).
! More effective multiple threads of control can be obtained by using
! native support for multithreading. See threads(7).
+ INTERFACE STABILITY
+ Committed
+
+ MT-LEVEL
+ MT-Safe
+
SEE ALSO
! getcontext(2), getcontext_extd(2), mmap(2), sigaction(2), sigprocmask(2),
! pthread_exit(3C), ucontext_alloc(3C), ucontext.h(3HEAD), attributes(7),
! standards(7), threads(7)
NOTES
The semantics of the uc_stack member of the ucontext_t structure have
changed as they apply to inputs to makecontext(). Prior to Solaris 10,
! the ss_sp member of the uc_stack tructure represented the high memory
address of the area reserved for the stack. The ss_sp member now
represents the base (low memory address), in keeping with other uses of
! ss_sp. This change in the meaning of ss_sp is the default behavior.
Binary compatibility has been preserved with releases prior to Solaris
10. Before recompiling, applications that use makecontext() must be
updated to reflect this behavior change. The example below demonstrates
a typical change that must be applied:
*** 157,163 ****
uc.uc_link = &back
makecontext(&uc, assign, 2, 100L, &value);
!
! February 17, 2023 MAKECONTEXT(3C)
--- 149,154 ----
uc.uc_link = &back
makecontext(&uc, assign, 2, 100L, &value);
! illumos March 20, 2023 illumos