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bsd-user/signal.c: do_sigaltstack

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Implement the meat of the sigaltstack(2) system call with do_sigaltstack.

With that, all the stubbed out routines are complete, so remove
now-incorrect comment.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-09 00:06:56 -07:00
parent 394cf69427
commit 43ed426784
1 changed files with 67 additions and 5 deletions
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72
bsd-user/signal.c
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@ -25,11 +25,6 @@
#include "hw/core/tcg-cpu-ops.h"
#include "host-signal.h"
/*
* Stubbed out routines until we merge signal support from bsd-user
* fork.
*/
static struct target_sigaction sigact_table[TARGET_NSIG];
static void host_signal_handler(int host_sig, siginfo_t *info, void *puc);
static void target_to_host_sigset_internal(sigset_t *d,
@ -573,6 +568,73 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
cpu_exit(thread_cpu);
}
/* do_sigaltstack() returns target values and errnos. */
/* compare to kern/kern_sig.c sys_sigaltstack() and kern_sigaltstack() */
abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp)
{
TaskState *ts = (TaskState *)thread_cpu->opaque;
int ret;
target_stack_t oss;
if (uoss_addr) {
/* Save current signal stack params */
oss.ss_sp = tswapl(ts->sigaltstack_used.ss_sp);
oss.ss_size = tswapl(ts->sigaltstack_used.ss_size);
oss.ss_flags = tswapl(sas_ss_flags(ts, sp));
}
if (uss_addr) {
target_stack_t *uss;
target_stack_t ss;
size_t minstacksize = TARGET_MINSIGSTKSZ;
ret = -TARGET_EFAULT;
if (!lock_user_struct(VERIFY_READ, uss, uss_addr, 1)) {
goto out;
}
__get_user(ss.ss_sp, &uss->ss_sp);
__get_user(ss.ss_size, &uss->ss_size);
__get_user(ss.ss_flags, &uss->ss_flags);
unlock_user_struct(uss, uss_addr, 0);
ret = -TARGET_EPERM;
if (on_sig_stack(ts, sp)) {
goto out;
}
ret = -TARGET_EINVAL;
if (ss.ss_flags != TARGET_SS_DISABLE
&& ss.ss_flags != TARGET_SS_ONSTACK
&& ss.ss_flags != 0) {
goto out;
}
if (ss.ss_flags == TARGET_SS_DISABLE) {
ss.ss_size = 0;
ss.ss_sp = 0;
} else {
ret = -TARGET_ENOMEM;
if (ss.ss_size < minstacksize) {
goto out;
}
}
ts->sigaltstack_used.ss_sp = ss.ss_sp;
ts->sigaltstack_used.ss_size = ss.ss_size;
}
if (uoss_addr) {
ret = -TARGET_EFAULT;
if (copy_to_user(uoss_addr, &oss, sizeof(oss))) {
goto out;
}
}
ret = 0;
out:
return ret;
}
/* do_sigaction() return host values and errnos */
int do_sigaction(int sig, const struct target_sigaction *act,
struct target_sigaction *oact)