Implemented TailCall ELT hook for arm32 Linux (#14713)

* Added TailCall ELT hook for arm32 Linux

* fixed review

2 files changed, 48 insertions, 10 deletions

diff --git a/src/vm/arm/asmhelpers.S b/src/vm/arm/asmhelpers.S
index 36933f5ea6..40faf9c3bc 100644
--- a/src/vm/arm/asmhelpers.S
+++ b/src/vm/arm/asmhelpers.S
@@ -662,11 +662,11 @@ NESTED_ENTRY ProfileEnterNaked, _TEXT, NoHandler
     PROLOG_PUSH "{r4, r5, r7, r11, lr}"
     PROLOG_STACK_SAVE_OFFSET r7, #8
 
-    // fields of PLATFORM_SPECIFIC_DATA, in reverse order
+    // fields of PROFILE_PLATFORM_SPECIFIC_DATA, in reverse order
 
     // UINT32      r0;         // Keep r0 & r1 contiguous to make returning 64-bit results easier
     // UINT32      r1;
-    // void       *R11;
+    // void       *r11;
     // void       *Pc;
     // union                   // Float arg registers as 32-bit (s0-s15) and 64-bit (d0-d7)
     // {
@@ -705,11 +705,11 @@ NESTED_ENTRY ProfileLeaveNaked, _TEXT, NoHandler
     PROLOG_PUSH "{r1, r2, r4, r5, r7, r11, lr}"
     PROLOG_STACK_SAVE_OFFSET r7, #16
 
-    // fields of PLATFORM_SPECIFIC_DATA, in reverse order
+    // fields of PROFILE_PLATFORM_SPECIFIC_DATA, in reverse order
 
     // UINT32      r0;         // Keep r0 & r1 contiguous to make returning 64-bit results easier
     // UINT32      r1;
-    // void       *R11;
+    // void       *r11;
     // void       *Pc;
     // union                   // Float arg registers as 32-bit (s0-s15) and 64-bit (d0-d7)
     // {
@@ -734,13 +734,56 @@ NESTED_ENTRY ProfileLeaveNaked, _TEXT, NoHandler
     push        { lr }
     push        { r11 }
     push        { r1 }
-    push        { r2 }
+    push        { r0 }
     mov         r1, sp
     bl          C_FUNC(ProfileLeave)
     EPILOG_STACK_RESTORE_OFFSET r7, #16
     EPILOG_POP "{r1, r2, r4, r5, r7, r11, pc}"
 NESTED_END ProfileLeaveNaked, _TEXT
 
+//
+// EXTERN_C void ProfileTailcallNaked(FunctionIDOrClientID functionIDOrClientID);
+//
+NESTED_ENTRY ProfileTailcallNaked, _TEXT, NoHandler
+    PROLOG_PUSH "{r1, r2, r4, r5, r7, r11, lr}"
+    PROLOG_STACK_SAVE_OFFSET r7, #16
+
+    // fields of PROFILE_PLATFORM_SPECIFIC_DATA, in reverse order
+
+    // UINT32      r0;         // Keep r0 & r1 contiguous to make returning 64-bit results easier
+    // UINT32      r1;
+    // void       *r11;
+    // void       *Pc;
+    // union                   // Float arg registers as 32-bit (s0-s15) and 64-bit (d0-d7)
+    // {
+    //     UINT32  s[16];
+    //     UINT64  d[8];
+    // };
+    // FunctionID  functionId;
+    // void       *probeSp;    // stack pointer of managed function 
+    // void       *profiledSp; // location of arguments on stack
+    // LPVOID      hiddenArg;
+    // UINT32      flags;
+    movw        r4, #2
+    push        { /* flags      */ r4 }
+    movw        r4, #0
+    push        { /* hiddenArg  */ r4 }
+    add         r5, r11, #8
+    push        { /* profiledSp */ r5 }
+    add         r5, sp, #40
+    push        { /* probeSp    */ r5 }
+    push        { /* functionId */ r0 }
+    vpush.64    { d0 - d7 }
+    push        { lr }
+    push        { r11 }
+    push        { r1 }
+    push        { r0 }
+    mov         r1, sp
+    bl          C_FUNC(ProfileTailcall)
+    EPILOG_STACK_RESTORE_OFFSET r7, #16
+    EPILOG_POP "{r1, r2, r4, r5, r7, r11, pc}"
+NESTED_END ProfileTailcallNaked, _TEXT
+
 // EXTERN_C int __fastcall HelperMethodFrameRestoreState(
 //         INDEBUG_COMMA(HelperMethodFrame *pFrame)
 //         MachState *pState
diff --git a/src/vm/arm/unixstubs.cpp b/src/vm/arm/unixstubs.cpp
index 62f60473ab..b1462fab3a 100644
--- a/src/vm/arm/unixstubs.cpp
+++ b/src/vm/arm/unixstubs.cpp
@@ -15,9 +15,4 @@ extern "C"
     {
         PORTABILITY_ASSERT("Implement for PAL");
     }
-
-    void ProfileTailcallNaked(FunctionIDOrClientID functionIDOrClientID)
-    {
-        PORTABILITY_ASSERT("Implement for PAL");
-    }
 };