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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.
--- old/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp
+++ new/src/hotspot/cpu/ppc/macroAssembler_ppc.cpp
@@ -1294,7 +1294,11 @@
// 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;
}
@@ -1315,15 +1319,24 @@
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;
@@ -1386,11 +1399,20 @@
|| (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
}
--- old/src/hotspot/cpu/ppc/vm_version_ppc.cpp
+++ new/src/hotspot/cpu/ppc/vm_version_ppc.cpp
@@ -745,7 +745,7 @@
unsigned long auxv = getauxval(AT_HWCAP2);
if (auxv & PPC_FEATURE2_HTM_NOSC) {
- if (auxv & PPC_FEATURE2_HAS_HTM) {
+ if (auxv & PPC_FEATURE2_HTM) {
// TM on POWER8 and POWER9 in compat mode (VM) is supported by the JVM.
// TM on POWER9 DD2.1 NV (baremetal) is not supported by the JVM (TM on
// POWER9 DD2.1 NV has a few issues that need a couple of firmware
--- old/src/hotspot/os_cpu/linux_ppc/os_linux_ppc.cpp
+++ new/src/hotspot/os_cpu/linux_ppc/os_linux_ppc.cpp
@@ -75,6 +75,9 @@
# include <poll.h>
# include <ucontext.h>
+#if ! (defined(__GLIBC__) || defined(__UCLIBC__))
+# include <asm/ptrace.h>
+#endif
address os::current_stack_pointer() {
intptr_t* csp;
@@ -109,20 +112,34 @@
// - if uc was filled by getcontext(), it is undefined - getcontext() does not fill
// it because the volatile registers are not needed to make setcontext() work.
// Hopefully it was zero'd out beforehand.
+#if defined(__GLIBC__) || defined(__UCLIBC__)
guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_get_pc in sigaction context");
return (address)uc->uc_mcontext.regs->nip;
+#else // Musl
+ guarantee(uc->uc_mcontext.gp_regs != NULL, "only use ucontext_get_pc in sigaction context");
+ return (address)uc->uc_mcontext.gp_regs[PT_NIP];
+#endif
}
// modify PC in ucontext.
// Note: Only use this for an ucontext handed down to a signal handler. See comment
// in ucontext_get_pc.
void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
+#if defined(__GLIBC__) || defined(__UCLIBC__)
guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_set_pc in sigaction context");
uc->uc_mcontext.regs->nip = (unsigned long)pc;
+#else // Musl
+ guarantee(uc->uc_mcontext.gp_regs != NULL, "only use ucontext_set_pc in sigaction context");
+ uc->uc_mcontext.gp_regs[PT_NIP] = (unsigned long)pc;
+#endif
}
intptr_t* os::Linux::ucontext_get_sp(const 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(const ucontext_t * uc) {
@@ -252,7 +264,11 @@
// 3.2.1 "Machine State Register"), however note that ISA notation for bit
// numbering is MSB 0, so for normal bit numbering (LSB 0) they come to be
// bits 33 and 34. It's not related to endianness, just a notation matter.
+#if defined(__GLIBC__) || defined(__UCLIBC__)
if (second_uc->uc_mcontext.regs->msr & 0x600000000) {
+#else // Musl
+ if (second_uc->uc_mcontext.gp_regs[PT_MSR] & 0x600000000) {
+#endif
if (TraceTraps) {
tty->print_cr("caught signal in transaction, "
"ignoring to jump to abort handler");
@@ -558,6 +578,7 @@
const ucontext_t* uc = (const 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);
@@ -566,8 +587,18 @@
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();
intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
@@ -594,7 +625,11 @@
// 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();
}
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