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-rw-r--r--mozilla-1690152.patch97
1 files changed, 97 insertions, 0 deletions
diff --git a/mozilla-1690152.patch b/mozilla-1690152.patch
new file mode 100644
index 0000000..fb672d3
--- /dev/null
+++ b/mozilla-1690152.patch
@@ -0,0 +1,97 @@
+
+# HG changeset patch
+# User Cameron Kaiser <spectre@floodgap.com>
+# Date 1612231460 0
+# Node ID 579a66fd796690fb752485215b2edaa6167ebf16
+# Parent a00504e040bfd34d01c74d478beb9d308ec085be
+Bug 1690152 - on ppc64 properly skip parameter slots if we overflow GPRs while still having FPRs to burn. r=tcampbell
+
+Differential Revision: https://phabricator.services.mozilla.com/D103724
+
+diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_ppc64_linux.cpp b/xpcom/reflect/xptcall/md/unix/xptcinvoke_ppc64_linux.cpp
+--- a/xpcom/reflect/xptcall/md/unix/xptcinvoke_ppc64_linux.cpp
++++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_ppc64_linux.cpp
+@@ -86,27 +86,37 @@ extern "C" void invoke_copy_to_stack(uin
+ case nsXPTType::T_WCHAR: value = s->val.wc; break;
+ default: value = (uint64_t) s->val.p; break;
+ }
+ }
+
+ if (!s->IsIndirect() && s->type == nsXPTType::T_DOUBLE) {
+ if (nr_fpr < FPR_COUNT) {
+ fpregs[nr_fpr++] = s->val.d;
+- nr_gpr++;
++ // Even if we have enough FPRs, still skip space in
++ // the parameter area if we ran out of placeholder GPRs.
++ if (nr_gpr < GPR_COUNT) {
++ nr_gpr++;
++ } else {
++ d++;
++ }
+ } else {
+ *((double *)d) = s->val.d;
+ d++;
+ }
+ }
+ else if (!s->IsIndirect() && s->type == nsXPTType::T_FLOAT) {
+ if (nr_fpr < FPR_COUNT) {
+ // Single-precision floats are passed in FPRs too.
+ fpregs[nr_fpr++] = s->val.f;
+- nr_gpr++;
++ if (nr_gpr < GPR_COUNT) {
++ nr_gpr++;
++ } else {
++ d++;
++ }
+ } else {
+ #ifdef __LITTLE_ENDIAN__
+ *((float *)d) = s->val.f;
+ #else
+ // Big endian needs adjustment to point to the least
+ // significant word.
+ float* p = (float*)d;
+ p++;
+diff --git a/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp b/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp
+--- a/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp
++++ b/xpcom/reflect/xptcall/md/unix/xptcstubs_ppc64_linux.cpp
+@@ -98,27 +98,37 @@ PrepareAndDispatch(nsXPTCStubBase * self
+ nr_gpr++;
+ else
+ ap++;
+ }
+
+ if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
+ if (nr_fpr < FPR_COUNT) {
+ dp->val.d = fpregs[nr_fpr++];
+- nr_gpr++;
++ // Even if we have enough FPRs, still skip space in
++ // the parameter area if we ran out of placeholder GPRs.
++ if (nr_gpr < GPR_COUNT) {
++ nr_gpr++;
++ } else {
++ ap++;
++ }
+ } else {
+ dp->val.d = *(double*)ap++;
+ }
+ continue;
+ }
+ if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
+ if (nr_fpr < FPR_COUNT) {
+ // Single-precision floats are passed in FPRs too.
+ dp->val.f = (float)fpregs[nr_fpr++];
+- nr_gpr++;
++ if (nr_gpr < GPR_COUNT) {
++ nr_gpr++;
++ } else {
++ ap++;
++ }
+ } else {
+ #ifdef __LITTLE_ENDIAN__
+ dp->val.f = *(float*)ap++;
+ #else
+ // Big endian needs adjustment to point to the least
+ // significant word.
+ float* p = (float*)ap;
+ p++;
+
bgstack15