gas: use "stack trace" instead of "unwind" for SFrame

SFrame format is meant for generating stack traces only.

gas/
	* as.c: Replace the use of "unwind" with "stack trace".
	* config/tc-aarch64.c: Likewise.
	* config/tc-aarch64.h: Likewise.
	* config/tc-i386.c: Likewise.
	* config/tc-i386.h: Likewise.
	* gen-sframe.c: Likewise.
	* gen-sframe.h: Likewise.
	* testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s: Likewise.
	* testsuite/gas/cfi-sframe/cfi-sframe-common-8.s: Likewise.
	* testsuite/gas/cfi-sframe/common-empty-2.s: Likewise.
	* testsuite/gas/cfi-sframe/common-empty-3.s: Likewise.

11 files changed, 35 insertions, 33 deletions

diff --git a/gas/as.c b/gas/as.c
index 602ed3b..f548294 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -317,7 +317,7 @@ Options:\n\
   fprintf (stream, _("\
                           generate GNU Build notes if none are present in the input\n"));
   fprintf (stream, _("\
-  --gsframe               generate SFrame unwind info\n"));
+  --gsframe               generate SFrame stack trace information\n"));
 #endif /* OBJ_ELF */
 
   fprintf (stream, _("\
diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index 2aeab6f..980710e 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -76,7 +76,7 @@ enum aarch64_abi_type
 };
 
 unsigned int aarch64_sframe_cfa_sp_reg;
-/* The other CFA base register for SFrame unwind info.  */
+/* The other CFA base register for SFrame stack trace info.  */
 unsigned int aarch64_sframe_cfa_fp_reg;
 unsigned int aarch64_sframe_cfa_ra_reg;
 
@@ -8474,7 +8474,7 @@ aarch64_init_frag (fragS * fragP, int max_chars)
     }
 }
 
-/* Whether SFrame unwind info is supported.  */
+/* Whether SFrame stack trace info is supported.  */
 
 bool
 aarch64_support_sframe_p (void)
diff --git a/gas/config/tc-aarch64.h b/gas/config/tc-aarch64.h
index 134c1f8..f11d048 100644
--- a/gas/config/tc-aarch64.h
+++ b/gas/config/tc-aarch64.h
@@ -263,19 +263,19 @@ extern void aarch64_after_parse_args (void);
 
 #ifdef OBJ_ELF
 
-/* Whether SFrame unwind info is supported.  */
+/* Whether SFrame stack trace info is supported.  */
 extern bool aarch64_support_sframe_p (void);
 #define support_sframe_p aarch64_support_sframe_p
 
-/* The stack-pointer register number for SFrame unwind info.  */
+/* The stack-pointer register number for SFrame stack trace info.  */
 extern unsigned int aarch64_sframe_cfa_sp_reg;
 #define SFRAME_CFA_SP_REG aarch64_sframe_cfa_sp_reg
 
-/* The base-pointer register number for CFA unwind info.  */
+/* The base-pointer register number for CFA stack trace info.  */
 extern unsigned int aarch64_sframe_cfa_fp_reg;
 #define SFRAME_CFA_FP_REG aarch64_sframe_cfa_fp_reg
 
-/* The return address register number for CFA unwind info.  */
+/* The return address register number for CFA stack trace info.  */
 extern unsigned int aarch64_sframe_cfa_ra_reg;
 #define SFRAME_CFA_RA_REG aarch64_sframe_cfa_ra_reg
 
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index e1f8f65..438180c 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -607,7 +607,7 @@ static int use_big_obj = 0;
 static int shared = 0;
 
 unsigned int x86_sframe_cfa_sp_reg;
-/* The other CFA base register for SFrame unwind info.  */
+/* The other CFA base register for SFrame stack trace info.  */
 unsigned int x86_sframe_cfa_fp_reg;
 unsigned int x86_sframe_cfa_ra_reg;
 
@@ -9285,7 +9285,7 @@ x86_cleanup (void)
 bool
 x86_support_sframe_p (void)
 {
-  /* At this time, SFrame unwind is supported for AMD64 ABI only.  */
+  /* At this time, SFrame stack trace is supported for AMD64 ABI only.  */
   return (x86_elf_abi == X86_64_ABI);
 }
 
diff --git a/gas/config/tc-i386.h b/gas/config/tc-i386.h
index 49d2d25..9247cde 100644
--- a/gas/config/tc-i386.h
+++ b/gas/config/tc-i386.h
@@ -363,15 +363,15 @@ extern bfd_vma x86_64_section_letter (int, const char **);
 extern void x86_cleanup (void);
 #define md_cleanup() x86_cleanup ()
 
-/* Whether SFrame unwind info is supported.  */
+/* Whether SFrame stack trace info is supported.  */
 extern bool x86_support_sframe_p (void);
 #define support_sframe_p x86_support_sframe_p
 
-/* The stack-pointer register number for SFrame unwind info.  */
+/* The stack-pointer register number for SFrame stack trace info.  */
 extern unsigned int x86_sframe_cfa_sp_reg;
 #define SFRAME_CFA_SP_REG x86_sframe_cfa_sp_reg
 
-/* The frame-pointer register number for CFA unwind info.  */
+/* The frame-pointer register number for SFrame stack trace info.  */
 extern unsigned int x86_sframe_cfa_fp_reg;
 #define SFRAME_CFA_FP_REG x86_sframe_cfa_fp_reg
 
diff --git a/gas/gen-sframe.c b/gas/gen-sframe.c
index d6961f8..c547059 100644
--- a/gas/gen-sframe.c
+++ b/gas/gen-sframe.c
@@ -33,7 +33,7 @@
 
 /* Whether frame row entries track RA.
 
-   A target may not need return address tracking for stack unwinding.  If it
+   A target may not need return address tracking for stack tracing.  If it
    does need the same, SFRAME_CFA_RA_REG must be defined with the return
    address register number.  */
 
@@ -892,7 +892,7 @@ sframe_xlate_ctx_add_fre (struct sframe_xlate_ctx *xlate_ctx,
   xlate_ctx->num_xlate_fres++;
 }
 
-/* A SFrame Frame Row Entry is self-sufficient in terms of unwind information
+/* A SFrame Frame Row Entry is self-sufficient in terms of stack tracing info
    for a given PC.  It contains information assimilated from multiple CFI
    instructions, and hence, a new SFrame FRE is initialized with the data from
    the previous known FRE, if any.
@@ -1024,7 +1024,7 @@ sframe_xlate_do_def_cfa_offset (struct sframe_xlate_ctx *xlate_ctx,
   gas_assert (cur_fre);
   /*  Define the current CFA rule to use the provided offset (but to keep
       the old register).  However, if the old register is not FP/SP,
-      skip creating SFrame unwind info for the function. */
+      skip creating SFrame stack trace info for the function.  */
   if ((cur_fre->cfa_base_reg == SFRAME_CFA_FP_REG)
       || (cur_fre->cfa_base_reg == SFRAME_CFA_SP_REG))
     {
@@ -1081,7 +1081,7 @@ sframe_xlate_do_val_offset (struct sframe_xlate_ctx *xlate_ctx ATTRIBUTE_UNUSED,
   /* Previous value of register is CFA + offset.  However, if the specified
      register is not interesting (FP or RA reg), the current DW_CFA_val_offset
      instruction can be safely skipped without sacrificing the asynchonicity of
-     unwind information.  */
+     stack trace information.  */
   if (cfi_insn->u.r == SFRAME_CFA_FP_REG)
     return SFRAME_XLATE_ERR_NOTREPRESENTED; /* Not represented.  */
 #ifdef SFRAME_FRE_RA_TRACKING
@@ -1103,8 +1103,8 @@ sframe_xlate_do_remember_state (struct sframe_xlate_ctx *xlate_ctx)
   struct sframe_row_entry *last_fre = xlate_ctx->last_fre;
 
   /* If there is no FRE state to remember, nothing to do here.  Return
-     early with non-zero error code, this will cause no SFrame unwind info
-     for the function involved.  */
+     early with non-zero error code, this will cause no SFrame stack trace
+     info for the function involved.  */
   if (!last_fre)
     return SFRAME_XLATE_ERR_INVAL;
 
@@ -1248,7 +1248,7 @@ sframe_do_cfi_insn (struct sframe_xlate_ctx *xlate_ctx,
     default:
       {
 	/* Other CFI opcodes are not processed at this time.
-	   These do not impact the coverage of the basic stack unwinding
+	   These do not impact the coverage of the basic stack tracing
 	   information as conveyed in the SFrame format.
 	    - DW_CFA_register,
 	    - ...
@@ -1285,7 +1285,7 @@ sframe_do_fde (struct sframe_xlate_ctx *xlate_ctx,
       err = sframe_do_cfi_insn (xlate_ctx, cfi_insn);
       if (err != SFRAME_XLATE_OK)
 	{
-	  /* Skip generating SFrame unwind info for the function if any
+	  /* Skip generating SFrame stack trace info for the function if any
 	     offending CFI is encountered by sframe_do_cfi_insn ().  */
 	  return err; /* Return the error code.  */
 	}
@@ -1309,10 +1309,11 @@ sframe_do_fde (struct sframe_xlate_ctx *xlate_ctx,
   return SFRAME_XLATE_OK;
 }
 
-/* Create SFrame unwind info for all functions.
+/* Create SFrame stack trace info for all functions.
 
-   This function consumes the already generated FDEs (by dw2gencfi) and
-   generates unwind data in SFrame format.  */
+   This function consumes the already generated DWARF FDEs (by dw2gencfi) and
+   generates data which is later emitted as stack trace information encoded in
+   the SFrame format.  */
 
 static void
 create_sframe_all (void)
@@ -1330,7 +1331,8 @@ create_sframe_all (void)
 
       /* Process and link SFrame FDEs if no error.  Also skip adding an SFrame
 	 FDE if it does not contain any SFrame FREs.  There is little use of an
-	 SFrame FDE if there is no unwind information about the function.  */
+	 SFrame FDE if there is no stack tracing information for the
+	 function.  */
       int err = sframe_do_fde (xlate_ctx, dw_fde);
       if (err || xlate_ctx->num_xlate_fres == 0)
 	{
@@ -1355,7 +1357,7 @@ output_sframe (segT sframe_seg)
   /* Setup the version specific access functions.  */
   sframe_set_version (SFRAME_VERSION_1);
 
-  /* Process all fdes and create SFrame unwind information.  */
+  /* Process all fdes and create SFrame stack trace information.  */
   create_sframe_all ();
 
   output_sframe_internal ();
diff --git a/gas/gen-sframe.h b/gas/gen-sframe.h
index 7763025..0a0b365 100644
--- a/gas/gen-sframe.h
+++ b/gas/gen-sframe.h
@@ -149,7 +149,7 @@ struct sframe_version_ops
   unsigned char (*set_func_info) (unsigned int, unsigned int, unsigned int);
 };
 
-/* Generate SFrame unwind info and prepare contents for the output.
+/* Generate SFrame stack trace info and prepare contents for the output.
    outout_sframe ()  is called at the end of file.  */
 
 extern void output_sframe (segT sframe_seg);
diff --git a/gas/testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s b/gas/testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s
index 8106c93..03ae313 100644
--- a/gas/testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s
+++ b/gas/testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s
@@ -2,9 +2,9 @@
 ## main idea behind this is to use the unused bits in the pointer values.
 ## Each pointer is patched with a PAC before writing to memory, and is verified
 ## before using it.
-## When the pointers are mangled, the unwinder needs to know so it can mask off
-## the PAC from the pointer value to recover the return address, and
-## conversely, skip doing so if the pointers are not mangled.
+## When the pointers are mangled, the stack trace generator needs to know so it
+## can mask off the PAC from the pointer value to recover the return address,
+## and conversely, skip doing so if the pointers are not mangled.
 ##
 ## .cfi_negate_ra_state CFI directive is used to convey this information.
 ##
diff --git a/gas/testsuite/gas/cfi-sframe/cfi-sframe-common-8.s b/gas/testsuite/gas/cfi-sframe/cfi-sframe-common-8.s
index f2083e6..50c57c9 100644
--- a/gas/testsuite/gas/cfi-sframe/cfi-sframe-common-8.s
+++ b/gas/testsuite/gas/cfi-sframe/cfi-sframe-common-8.s
@@ -1,8 +1,8 @@
 ## cfi_val_offset when used with "not interesting" registers (from the
 ## perspective of SFrame section, non FP/RA registers are not
 ## interesting) does not affect the asynchronicity of the SFrame
-## unwind information.  Such CFI directives can be skipped for SFrame
-## unwind info generation.
+## stack trace information.  Such CFI directives can be skipped for SFrame
+## stack trace info generation.
 	.cfi_startproc
 	.long 0
 	.cfi_def_cfa_offset 16
diff --git a/gas/testsuite/gas/cfi-sframe/common-empty-2.s b/gas/testsuite/gas/cfi-sframe/common-empty-2.s
index 146c53d..53bb8c0 100644
--- a/gas/testsuite/gas/cfi-sframe/common-empty-2.s
+++ b/gas/testsuite/gas/cfi-sframe/common-empty-2.s
@@ -1,5 +1,5 @@
 ## CFA register is not defined to be SP/FP.
-## No SFrame unwind info for this function will be generated.
+## No SFrame stack trace info for this function will be generated.
 	.cfi_startproc simple
 	.long 0
 	.long 0
diff --git a/gas/testsuite/gas/cfi-sframe/common-empty-3.s b/gas/testsuite/gas/cfi-sframe/common-empty-3.s
index 982fe0c..cd58499 100644
--- a/gas/testsuite/gas/cfi-sframe/common-empty-3.s
+++ b/gas/testsuite/gas/cfi-sframe/common-empty-3.s
@@ -1,5 +1,5 @@
 ## The return column is not the default value.
-## No SFrame unwind info for this function will be generated.
+## No SFrame stack trace info for this function will be generated.
 	.cfi_startproc
 	.cfi_return_column 0
 	.long 0