TODO(gprof): aarch64: morello: add gprof profiling support to asm

Assembly prologue code with mcount call for gprof instrumentation.

TODO: untested, likely needs further runtime updates too.

diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h
index 6575503c8b65e27420c4e4ccc13e73a66f8b672c..eb58ee340da54275a7399972b40e9f73d2a3cda4 100644 (file)
--- a/sysdeps/aarch64/sysdep.h
+++ b/sysdeps/aarch64/sysdep.h
@@ -151,10 +151,44 @@ GNU_PROPERTY (FEATURE_1_AND, FEATURE_1_BTI)
   ASM_SIZE_DIRECTIVE(name)
 
 /* If compiled for profiling, call `mcount' at the start of each function.  */
-#ifdef PROF
-# ifdef __CHERI_PURE_CAPABILITY__
-#  error mcount profiling is not supported with purecap ABI
-# endif
+#if defined PROF && defined __CHERI_PURE_CAPABILITY__
+/* Note: c9 must be preserved in var arg functions.  */
+# define CALL_MCOUNT                                           \
+       stp     c30, c9, [csp, #-160]!;                         \
+       cfi_adjust_cfa_offset (160);                            \
+       cfi_rel_offset (c30, 0);                                \
+       cfi_rel_offset (c9, 16);                                \
+       stp     c0, c1, [csp, #32];                             \
+       cfi_rel_offset (c0, 32);                                \
+       cfi_rel_offset (c1, 48);                                \
+       stp     c2, c3, [csp, #64];                             \
+       cfi_rel_offset (c2, 64);                                \
+       cfi_rel_offset (c3, 80);                                \
+       stp     c4, c5, [csp, #96];                             \
+       cfi_rel_offset (c4, 96);                                \
+       cfi_rel_offset (c5, 112);                               \
+       stp     c6, c7, [csp, #128];                            \
+       cfi_rel_offset (c6, 128);                               \
+       cfi_rel_offset (c7, 144);                               \
+       mov     c0, c30;                                        \
+       bl      mcount;                                         \
+       ldp     c0, c1, [csp, #32];                             \
+       cfi_restore (c0);                                       \
+       cfi_restore (c1);                                       \
+       ldp     c2, c3, [csp, #64];                             \
+       cfi_restore (c2);                                       \
+       cfi_restore (c3);                                       \
+       ldp     c4, c5, [csp, #96];                             \
+       cfi_restore (c4);                                       \
+       cfi_restore (c5);                                       \
+       ldp     c6, c7, [csp, #128];                            \
+       cfi_restore (c6);                                       \
+       cfi_restore (c7);                                       \
+       ldp     c30, c9, [csp, #160];                           \
+       cfi_adjust_cfa_offset (-160);                           \
+       cfi_restore (c30);                                      \
+       cfi_restore (c9);
+#elif defined PROF && !defined __CHERI_PURE_CAPAILITY__
 # define CALL_MCOUNT                                           \
        str     x30, [sp, #-80]!;                               \
        cfi_adjust_cfa_offset (80);                             \