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linux-user: Handle PPC64 ELFv2 Function Pointers

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Function pointers in the 64-bit ELFv2 PowerPC ABI are actual (internal)
entry point addresses.  However, when invoking a function via a function
pointer, GPR 12 must also be set to this address so that the TOC may be
handled properly.

Add this support to the invocation of a signal handler.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-06-30 08:13:42 -05:00 committed by Alexander Graf
parent 19774ec5c4
commit 145855801a
1 changed files with 30 additions and 10 deletions
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40
linux-user/signal.c
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@ -4681,6 +4681,9 @@ static void setup_frame(int sig, struct target_sigaction *ka,
target_ulong frame_addr, newsp;
int err = 0;
int signal;
#if defined(TARGET_PPC64)
struct image_info *image = ((TaskState *)thread_cpu->opaque)->info;
#endif
frame_addr = get_sigframe(ka, env, sizeof(*frame));
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1))
@ -4725,11 +4728,18 @@ static void setup_frame(int sig, struct target_sigaction *ka,
env->gpr[4] = frame_addr + offsetof(struct target_sigframe, sctx);
#if defined(TARGET_PPC64)
/* PPC64 function pointers are pointers to OPD entries. */
struct target_func_ptr *handler =
(struct target_func_ptr *)g2h(ka->_sa_handler);
env->nip = tswapl(handler->entry);
env->gpr[2] = tswapl(handler->toc);
if (get_ppc64_abi(image) < 2) {
/* ELFv1 PPC64 function pointers are pointers to OPD entries. */
struct target_func_ptr *handler =
(struct target_func_ptr *)g2h(ka->_sa_handler);
env->nip = tswapl(handler->entry);
env->gpr[2] = tswapl(handler->toc);
} else {
/* ELFv2 PPC64 function pointers are entry points, but R12
* must also be set */
env->nip = tswapl((target_ulong) ka->_sa_handler);
env->gpr[12] = env->nip;
}
#else
env->nip = (target_ulong) ka->_sa_handler;
#endif
@ -4756,6 +4766,9 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
target_ulong rt_sf_addr, newsp = 0;
int i, err = 0;
int signal;
#if defined(TARGET_PPC64)
struct image_info *image = ((TaskState *)thread_cpu->opaque)->info;
#endif
rt_sf_addr = get_sigframe(ka, env, sizeof(*rt_sf));
if (!lock_user_struct(VERIFY_WRITE, rt_sf, rt_sf_addr, 1))
@ -4814,11 +4827,18 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
env->gpr[6] = (target_ulong) h2g(rt_sf);
#if defined(TARGET_PPC64)
/* PPC64 function pointers are pointers to OPD entries. */
struct target_func_ptr *handler =
(struct target_func_ptr *)g2h(ka->_sa_handler);
env->nip = tswapl(handler->entry);
env->gpr[2] = tswapl(handler->toc);
if (get_ppc64_abi(image) < 2) {
/* ELFv1 PPC64 function pointers are pointers to OPD entries. */
struct target_func_ptr *handler =
(struct target_func_ptr *)g2h(ka->_sa_handler);
env->nip = tswapl(handler->entry);
env->gpr[2] = tswapl(handler->toc);
} else {
/* ELFv2 PPC64 function pointers are entry points, but R12
* must also be set */
env->nip = tswapl((target_ulong) ka->_sa_handler);
env->gpr[12] = env->nip;
}
#else
env->nip = (target_ulong) ka->_sa_handler;
#endif