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Code Issues Releases Activity

Change the clear_ret argument of get_mcontext() to be a flags argument.

Browse Source 
Since all callers either passed 0 or 1 for clear_ret, define bit 0 in
the flags for use as clear_ret. Reserve bits 1, 2 and 3 for use by MI
code for possible (but unlikely) future use. The remaining bits are for
use by MD code.

This change is triggered by a need on ia64 to have another knob for
get_mcontext().
This commit is contained in:
Marcel Moolenaar 2003-11-09 20:31:04 +00:00
parent 116f7a3ddb
commit fcaa2925a9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122364
11 changed files with 27 additions and 20 deletions
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4
sys/alpha/alpha/machdep.c
View File

@ -2027,14 +2027,14 @@ set_regs(td, regs)
}
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
/*
* Use a trapframe for getsetcontext, so just copy the
* threads trapframe.
*/
bcopy(td->td_frame, &mcp->mc_regs, sizeof(struct trapframe));
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_regs[FRAME_V0] = 0;
mcp->mc_regs[FRAME_A4] = 0;
mcp->mc_regs[FRAME_A3] = 0;

4
sys/amd64/amd64/machdep.c
View File

@ -1441,7 +1441,7 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
* Get machine context.
*/
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
struct trapframe *tp;
@ -1462,7 +1462,7 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
mcp->mc_rbp = tp->tf_rbp;
mcp->mc_rbx = tp->tf_rbx;
mcp->mc_rcx = tp->tf_rcx;
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_rax = 0;
mcp->mc_rdx = 0;
} else {

4
sys/i386/i386/machdep.c
View File

@ -2377,7 +2377,7 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
* Get machine context.
*/
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
struct trapframe *tp;
@ -2394,7 +2394,7 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
mcp->mc_esi = tp->tf_esi;
mcp->mc_ebp = tp->tf_ebp;
mcp->mc_isp = tp->tf_isp;
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_eax = 0;
mcp->mc_edx = 0;
} else {

4
sys/ia64/ia64/machdep.c
View File

@ -1073,7 +1073,7 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
#endif
int
get_mcontext(struct thread *td, mcontext_t *mc, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mc, int flags)
{
struct _special s;
struct trapframe *tf;
@ -1108,7 +1108,7 @@ get_mcontext(struct thread *td, mcontext_t *mc, int clear_ret)
* return register, just like gr8-gr10.
*/
mc->mc_flags |= _MC_FLAGS_RETURN_VALID;
if (!clear_ret) {
if ((flags & GET_MC_CLEAR_RET) == 0) {
mc->mc_scratch.gr8 = tf->tf_scratch.gr8;
mc->mc_scratch.gr9 = tf->tf_scratch.gr9;
mc->mc_scratch.gr10 = tf->tf_scratch.gr10;

4
sys/kern/kern_context.c
View File

@ -70,7 +70,7 @@ getcontext(struct thread *td, struct getcontext_args *uap)
if (uap->ucp == NULL)
ret = EINVAL;
else {
get_mcontext(td, &uc.uc_mcontext, 1);
get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
PROC_LOCK(td->td_proc);
uc.uc_sigmask = td->td_sigmask;
PROC_UNLOCK(td->td_proc);
@ -114,7 +114,7 @@ swapcontext(struct thread *td, struct swapcontext_args *uap)
if (uap->oucp == NULL || uap->ucp == NULL)
ret = EINVAL;
else {
get_mcontext(td, &uc.uc_mcontext, 1);
get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
PROC_LOCK(td->td_proc);
uc.uc_sigmask = td->td_sigmask;
PROC_UNLOCK(td->td_proc);

4
sys/pc98/i386/machdep.c
View File

@ -2435,7 +2435,7 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
* Get machine context.
*/
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
struct trapframe *tp;
@ -2453,7 +2453,7 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
mcp->mc_ebp = tp->tf_ebp;
mcp->mc_isp = tp->tf_isp;
mcp->mc_ebx = tp->tf_ebx;
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_eax = 0;
mcp->mc_edx = 0;
} else {

4
sys/pc98/pc98/machdep.c
View File

@ -2435,7 +2435,7 @@ set_fpregs(struct thread *td, struct fpreg *fpregs)
* Get machine context.
*/
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
struct trapframe *tp;
@ -2453,7 +2453,7 @@ get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
mcp->mc_ebp = tp->tf_ebp;
mcp->mc_isp = tp->tf_isp;
mcp->mc_ebx = tp->tf_ebx;
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_eax = 0;
mcp->mc_edx = 0;
} else {

2
sys/powerpc/aim/machdep.c
View File

@ -581,7 +581,7 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
#endif
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
return (ENOSYS);

2
sys/powerpc/powerpc/machdep.c
View File

@ -581,7 +581,7 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
#endif
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
{
return (ENOSYS);

4
sys/sparc64/sparc64/machdep.c
View File

@ -564,7 +564,7 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
#endif
int
get_mcontext(struct thread *td, mcontext_t *mc, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mc, int flags)
{
struct trapframe *tf;
struct pcb *pcb;
@ -572,7 +572,7 @@ get_mcontext(struct thread *td, mcontext_t *mc, int clear_ret)
tf = td->td_frame;
pcb = td->td_pcb;
bcopy(tf, mc, sizeof(*tf));
if (clear_ret != 0) {
if (flags & GET_MC_CLEAR_RET) {
mc->mc_out[0] = 0;
mc->mc_out[1] = 0;
}

11
sys/sys/ucontext.h
View File

@ -83,9 +83,16 @@ __END_DECLS
struct thread;
/*
* Flags for get_mcontext(). The low order 4 bits (i.e a mask of 0x0f) are
* reserved for use by machine independent code. All other bits are for use
* by machine dependent code.
*/
#define GET_MC_CLEAR_RET 1
/* Machine-dependent functions: */
int get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret);
int set_mcontext(struct thread *td, const mcontext_t *mcp);
int get_mcontext(struct thread *, mcontext_t *, int);
int set_mcontext(struct thread *, const mcontext_t *);
#endif /* !_KERNEL */