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target/xtensa fixes for v8.2:

Browse source 
- fix signal delivery in FDPIC
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Merge tag '20231119-xtensa-1' of https://github.com/OSLL/qemu-xtensa into staging

target/xtensa fixes for v8.2:

- fix signal delivery in FDPIC

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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* tag '20231119-xtensa-1' of https://github.com/OSLL/qemu-xtensa:
  linux-user: xtensa: fix signal delivery in FDPIC

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-11-20 05:25:19 -05:00
parent 1817af991c 1b173d0606
commit af9264da80
1 changed files with 26 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
linux-user/xtensa/signal.c
View file

@ -157,6 +157,9 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
{
abi_ulong frame_addr;
struct target_rt_sigframe *frame;
int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
abi_ulong handler = 0;
abi_ulong handler_fdpic_GOT = 0;
uint32_t ra;
bool abi_call0;
unsigned base;
@ -165,6 +168,17 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
frame_addr = get_sigframe(ka, env, sizeof(*frame));
trace_user_setup_rt_frame(env, frame_addr);
if (is_fdpic) {
abi_ulong funcdesc_ptr = ka->_sa_handler;
if (get_user_ual(handler, funcdesc_ptr)
|| get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) {
goto give_sigsegv;
}
} else {
handler = ka->_sa_handler;
}
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto give_sigsegv;
}
@ -185,14 +199,21 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
}
if (ka->sa_flags & TARGET_SA_RESTORER) {
ra = ka->sa_restorer;
if (is_fdpic) {
if (get_user_ual(ra, ka->sa_restorer)) {
unlock_user_struct(frame, frame_addr, 0);
goto give_sigsegv;
}
} else {
ra = ka->sa_restorer;
}
} else {
/* Not used, but retain for ABI compatibility. */
install_sigtramp(frame->retcode);
ra = default_rt_sigreturn;
}
memset(env->regs, 0, sizeof(env->regs));
env->pc = ka->_sa_handler;
env->pc = handler;
env->regs[1] = frame_addr;
env->sregs[WINDOW_BASE] = 0;
env->sregs[WINDOW_START] = 1;
@ -212,6 +233,9 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
env->regs[base + 3] = frame_addr + offsetof(struct target_rt_sigframe,
info);
env->regs[base + 4] = frame_addr + offsetof(struct target_rt_sigframe, uc);
if (is_fdpic) {
env->regs[base + 11] = handler_fdpic_GOT;
}
unlock_user_struct(frame, frame_addr, 1);
return;