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This is the first of 3 commits that will get IBM's JDK 1.3 working

Browse Source 
with FreeBSD (not including the MINSIGSTKSZ issue, which belongs to
Marcel).  Due to time constraints, I'm going to space them out over a
few days.

This fixes two problems with linux_sigaltstack()

o ss == 0 is perfectly valid use, so do not fail in this case.

o Fix flag handling:
 - Our SS_DISABLE is 4, linux's is 2, so we need conversion routines.
	These conversion routines will be needed by linux_rt_sendsig()
	and linux_rt_sigreturn (forthcoming), so they are not static.
 - Linux's flag 0 historically meant SS_ONSTACK according to a comment
	in their linux/kernel/signal.c file.

Among other things, this fixes a warning from Sun's JDK 1.3:
"Java HotSpot(TM) Client VM warning: cannot uninstall alt signal stack"

Reviewed by: marcel
Tested by:   sto@stat.duke.edu, many others on freebsd-java@
This commit is contained in:
Andrew Gallatin 2000-10-13 01:57:43 +00:00
parent 13387c45eb
commit 931a725809
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=67051
2 changed files with 47 additions and 10 deletions
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8
sys/i386/linux/linux.h
View File

@ -159,6 +159,14 @@ struct linux_new_utsname {
/* sigaltstack */
#define LINUX_MINSIGSTKSZ 2048
#define LINUX_SS_ONSTACK_BC 0 /* backwards compat SS_ONSTACK */
#define LINUX_SS_ONSTACK 1
#define LINUX_SS_DISABLE 2
int linux_to_bsd_sigaltstack(int lsa);
int bsd_to_linux_sigaltstack(int bsa);
typedef void (*linux_handler_t)(int);
typedef u_long linux_osigset_t;

49
sys/i386/linux/linux_machdep.c
View File

@ -66,6 +66,32 @@ struct linux_select_argv {
struct timeval *timeout;
};
int
linux_to_bsd_sigaltstack(int lsa)
{
int bsa = 0;
if (lsa & LINUX_SS_DISABLE)
bsa |= SS_DISABLE;
if (lsa & LINUX_SS_ONSTACK)
bsa |= SS_ONSTACK;
if (lsa == LINUX_SS_ONSTACK_BC)
bsa = SS_ONSTACK;
return (bsa);
}
int
bsd_to_linux_sigaltstack(int bsa)
{
int lsa = 0;
if (bsa & SS_DISABLE)
lsa |= LINUX_SS_DISABLE;
if (bsa & SS_ONSTACK)
lsa |= LINUX_SS_ONSTACK;
return (lsa);
}
int
linux_execve(struct proc *p, struct linux_execve_args *args)
{
@ -606,16 +632,19 @@ linux_sigaltstack(p, uap)
(long)p->p_pid, uap->uss, uap->uoss);
#endif
error = copyin(uap->uss, &lss, sizeof(linux_stack_t));
if (error)
return (error);
ss = stackgap_alloc(&sg, sizeof(stack_t));
ss->ss_sp = lss.ss_sp;
ss->ss_size = (lss.ss_size >= LINUX_MINSIGSTKSZ &&
lss.ss_size < MINSIGSTKSZ) ? MINSIGSTKSZ : lss.ss_size;
ss->ss_flags = lss.ss_flags;
if (uap->uss == NULL) {
ss = NULL;
} else {
error = copyin(uap->uss, &lss, sizeof(linux_stack_t));
if (error)
return (error);
ss = stackgap_alloc(&sg, sizeof(stack_t));
ss->ss_sp = lss.ss_sp;
ss->ss_size = (lss.ss_size >= LINUX_MINSIGSTKSZ &&
lss.ss_size < MINSIGSTKSZ) ? MINSIGSTKSZ : lss.ss_size;
ss->ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
}
oss = (uap->uoss != NULL)
? stackgap_alloc(&sg, sizeof(stack_t))
: NULL;
@ -627,7 +656,7 @@ linux_sigaltstack(p, uap)
if (!error && oss != NULL) {
lss.ss_sp = oss->ss_sp;
lss.ss_size = oss->ss_size;
lss.ss_flags = oss->ss_flags;
lss.ss_flags = bsd_to_linux_sigaltstack(oss->ss_flags);
error = copyout(&lss, uap->uoss, sizeof(linux_stack_t));
}