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Subject: Fix compilation with different ucontext_t on musl
Upstream: No
Author: Simon Frankenberger <simon-alpine@fraho.eu>
The machine state registers have to be accessed differently when
running on musl libc. This patch fix this by replacing
"uc_mcontext.regs->grp" with "uc_mcontext.gp_regs"
and accessing the named fields (like "->nip") by the array index constants.
--- openjdk/hotspot/src/cpu/ppc/vm/macroAssembler_ppc.cpp
+++ openjdk/hotspot/src/cpu/ppc/vm/macroAssembler_ppc.cpp
@@ -1243,7 +1243,11 @@ bool MacroAssembler::is_load_from_polling_page(int instruction, void* ucontext,
// the safepoing polling page.
ucontext_t* uc = (ucontext_t*) ucontext;
// Set polling address.
+#if defined(__GLIBC__) || defined(__UCLIBC__)
address addr = (address)uc->uc_mcontext.regs->gpr[ra] + (ssize_t)ds;
+#else // Musl
+ address addr = (address)uc->uc_mcontext.gp_regs[ra] + (ssize_t)ds;
+#endif
if (polling_address_ptr != NULL) {
*polling_address_ptr = addr;
}
@@ -1264,15 +1268,24 @@ bool MacroAssembler::is_memory_serialization(int instruction, JavaThread* thread
int rb = inv_rb_field(instruction);
// look up content of ra and rb in ucontext
+#if defined(__GLIBC__) || defined(__UCLIBC__)
address ra_val=(address)uc->uc_mcontext.regs->gpr[ra];
long rb_val=(long)uc->uc_mcontext.regs->gpr[rb];
+#else // Musl
+ address ra_val=(address)uc->uc_mcontext.gp_regs[ra];
+ long rb_val=(long)uc->uc_mcontext.gp_regs[rb];
+#endif
return os::is_memory_serialize_page(thread, ra_val+rb_val);
} else if (is_stw(instruction) || is_stwu(instruction)) {
int ra = inv_ra_field(instruction);
int d1 = inv_d1_field(instruction);
// look up content of ra in ucontext
+#if defined(__GLIBC__) || defined(__UCLIBC__)
address ra_val=(address)uc->uc_mcontext.regs->gpr[ra];
+#else // Musl
+ address ra_val=(address)uc->uc_mcontext.gp_regs[ra];
+#endif
return os::is_memory_serialize_page(thread, ra_val+d1);
} else {
return false;
@@ -1335,11 +1348,20 @@ address MacroAssembler::get_stack_bang_address(int instruction, void *ucontext)
|| (is_stdu(instruction) && rs == 1)) {
int ds = inv_ds_field(instruction);
// return banged address
+#if defined(__GLIBC__) || defined(__UCLIBC__)
return ds+(address)uc->uc_mcontext.regs->gpr[ra];
+#else // Musl
+ return ds+(address)uc->uc_mcontext.gp_regs[ra];
+#endif
} else if (is_stdux(instruction) && rs == 1) {
int rb = inv_rb_field(instruction);
+#if defined(__GLIBC__) || defined(__UCLIBC__)
address sp = (address)uc->uc_mcontext.regs->gpr[1];
long rb_val = (long)uc->uc_mcontext.regs->gpr[rb];
+#else // Musl
+ address sp = (address)uc->uc_mcontext.gp_regs[1];
+ long rb_val = (long)uc->uc_mcontext.gp_regs[rb];
+#endif
return ra != 1 || rb_val >= 0 ? NULL // not a stack bang
: sp + rb_val; // banged address
}
--- openjdk/hotspot/src/os_cpu/linux_ppc/vm/os_linux_ppc.cpp
+++ openjdk/hotspot/src/os_cpu/linux_ppc/vm/os_linux_ppc.cpp
@@ -75,6 +75,10 @@
# include <poll.h>
# include <ucontext.h>
+#if ! (defined(__GLIBC__) || defined(__UCLIBC__))
+# include <asm/ptrace.h>
+#endif
+
address os::current_stack_pointer() {
intptr_t* csp;
@@ -110,11 +114,19 @@ address os::Linux::ucontext_get_pc(ucontext_t * uc) {
// it because the volatile registers are not needed to make setcontext() work.
// Hopefully it was zero'd out beforehand.
guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_get_pc in sigaction context");
+#if defined(__GLIBC__) || defined(__UCLIBC__)
return (address)uc->uc_mcontext.regs->nip;
+#else // Musl
+ return (address)uc->uc_mcontext.gp_regs[PT_NIP];
+#endif
}
intptr_t* os::Linux::ucontext_get_sp(ucontext_t * uc) {
+#if defined(__GLIBC__) || defined(__UCLIBC__)
return (intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/];
+#else // Musl
+ return (intptr_t*)uc->uc_mcontext.gp_regs[1/*REG_SP*/];
+#endif
}
intptr_t* os::Linux::ucontext_get_fp(ucontext_t * uc) {
@@ -213,7 +225,11 @@ JVM_handle_linux_signal(int sig,
if (uc) {
address const pc = os::Linux::ucontext_get_pc(uc);
if (pc && StubRoutines::is_safefetch_fault(pc)) {
+#if defined(__GLIBC__) || defined(__UCLIBC__)
uc->uc_mcontext.regs->nip = (unsigned long)StubRoutines::continuation_for_safefetch_fault(pc);
+#else // Musl
+ uc->uc_mcontext.gp_regs[PT_NIP] = (unsigned long)StubRoutines::continuation_for_safefetch_fault(pc);
+#endif
return true;
}
}
@@ -364,7 +380,11 @@ JVM_handle_linux_signal(int sig,
// continue at the next instruction after the faulting read. Returning
// garbage from this read is ok.
thread->set_pending_unsafe_access_error();
+#if defined(__GLIBC__) || defined(__UCLIBC__)
uc->uc_mcontext.regs->nip = ((unsigned long)pc) + 4;
+#else // Musl
+ uc->uc_mcontext.gp_regs[PT_NIP] = ((unsigned long)pc) + 4;
+#endif
return true;
}
}
@@ -383,7 +403,11 @@ JVM_handle_linux_signal(int sig,
// continue at the next instruction after the faulting read. Returning
// garbage from this read is ok.
thread->set_pending_unsafe_access_error();
+#if defined(__GLIBC__) || defined(__UCLIBC__)
uc->uc_mcontext.regs->nip = ((unsigned long)pc) + 4;
+#else // Musl
+ uc->uc_mcontext.gp_regs[PT_NIP] = ((unsigned long)pc) + 4;
+#endif
return true;
}
}
@@ -406,7 +430,11 @@ JVM_handle_linux_signal(int sig,
if (stub != NULL) {
// Save all thread context in case we need to restore it.
if (thread != NULL) thread->set_saved_exception_pc(pc);
+#if defined(__GLIBC__) || defined(__UCLIBC__)
uc->uc_mcontext.regs->nip = (unsigned long)stub;
+#else
+ uc->uc_mcontext.gp_regs[PT_NIP] = (unsigned long)stub;
+#endif
return true;
}
@@ -564,6 +592,7 @@ void os::print_context(outputStream *st, void *context) {
ucontext_t* uc = (ucontext_t*)context;
st->print_cr("Registers:");
+#if defined(__GLIBC__) || defined(__UCLIBC__)
st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->nip);
st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->link);
st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.regs->ctr);
@@ -572,6 +601,16 @@ void os::print_context(outputStream *st, void *context) {
st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.regs->gpr[i]);
if (i % 3 == 2) st->cr();
}
+#else // Musl
+ st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.gp_regs[PT_NIP]);
+ st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.gp_regs[PT_LNK]);
+ st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.gp_regs[PT_CTR]);
+ st->cr();
+ for (int i = 0; i < 32; i++) {
+ st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.gp_regs[i]);
+ if (i % 3 == 2) st->cr();
+ }
+#endif
st->cr();
st->cr();
@@ -600,7 +639,11 @@ void os::print_register_info(outputStream *st, void *context) {
// this is only for the "general purpose" registers
for (int i = 0; i < 32; i++) {
st->print("r%-2d=", i);
+#if defined(__GLIBC__) || defined(__UCLIBC__)
print_location(st, uc->uc_mcontext.regs->gpr[i]);
+#else // Musl
+ print_location(st, uc->uc_mcontext.gp_regs[i]);
+#endif
}
st->cr();
}
--- openjdk/hotspot/src/os_cpu/linux_ppc/vm/thread_linux_ppc.cpp
+++ openjdk/hotspot/src/os_cpu/linux_ppc/vm/thread_linux_ppc.cpp
@@ -27,6 +27,10 @@
#include "runtime/frame.inline.hpp"
#include "runtime/thread.hpp"
+#if ! (defined(__GLIBC__) || defined(__UCLIBC__))
+#include <asm/ptrace.h>
+#endif
+
bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
assert(this->is_Java_thread(), "must be JavaThread");
@@ -42,8 +46,13 @@ bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext,
// if we were running Java code when SIGPROF came in.
if (isInJava) {
ucontext_t* uc = (ucontext_t*) ucontext;
+#if defined(__GLIBC__) || defined(__UCLIBC__)
frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],
(address)uc->uc_mcontext.regs->nip);
+#else // Musl
+ frame ret_frame((intptr_t*)uc->uc_mcontext.gp_regs[1/*REG_SP*/],
+ (address)uc->uc_mcontext.gp_regs[PT_NIP]);
+#endif
if (ret_frame.pc() == NULL) {
// ucontext wasn't useful
@@ -56,7 +65,11 @@ bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext,
if (m == NULL || !m->is_valid_method()) return false;
if (!Metaspace::contains((const void*)m)) return false;
+#if defined(__GLIBC__) || defined(__UCLIBC__)
uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];
+#else // Musl
+ uint64_t reg_bcp = uc->uc_mcontext.gp_regs[14/*R14_bcp*/];
+#endif
uint64_t istate_bcp = istate->bcp;
uint64_t code_start = (uint64_t)(m->code_base());
uint64_t code_end = (uint64_t)(m->code_base() + m->code_size());
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