Fix typos and technical inaccuracies in source files

Typos fixed:
- 'fillint' -> 'filling' (stackman_switch.h)
- 'wiht' -> 'with' (test.c, test_cc.cc)
- 'ithout' -> 'without' (test_cc.cc)
- 'stackpoiners' -> 'stack pointers' (test.c, test_cc.cc)
- 'incle' -> 'include' (stackman_impl.h)
- 'identif' -> 'identify' (README.md)
- 'argments' -> 'arguments' (switch_x64_msvc.asm)
- 'suffle' -> 'shuffle' (switch_x64_msvc.asm)
- 'nonvolatile' -> 'non-volatile' (switch_x64_msvc.asm)

Technical corrections:
- 'callee-stored' -> 'callee-saved' (correct ABI terminology)
- Fixed inconsistent comments in switch_template.h that said
  'volatile registers' when describing non-volatile registers

Author: kristjanvalur

README.md

@@ -179,7 +179,7 @@ See `.github/workflows/buildcommit.yml` for the complete CI configuration.
 
 ### Adding new platforms
 
-1. Modify `platform.h` to identif the platform environment.  Define an ABI name and
+1. Modify `platform.h` to identify the platform environment.  Define an ABI name and
    include custom header files.
 2. Use the `switch_template.h` to help build a `switch_ABI.h` file for your ABI.
 3. Provide an assembler version, `switch_ABI.S` by compiling the `gen_asm.c` file for your platform.

stackman/platforms/switch_template.h

@@ -31,7 +31,7 @@ void *STACKMAN_SWITCH_INASM_NAME(stackman_cb_t callback, void *context)
 	/* assembly to save non-volatile registers
      * those, according to abi, that functions must save/restore if they
      * intend to use them
-	/* __asm__("push volatile registers") */
+	/* __asm__("push non-volatile registers") */
 
 	/* sp = get stack pointer from assembly code */
 	/* __asm__("get sp into stack_pointer") */
@@ -41,7 +41,7 @@ void *STACKMAN_SWITCH_INASM_NAME(stackman_cb_t callback, void *context)
 	/* __asm__("store sp from stack_pointer") */
 	stack_pointer = callback(context, STACKMAN_OP_RESTORE, stack_pointer);
 	/* restore non-volatile registers from stack */
-	/* __asm__("pop volatile registers") */
+	/* __asm__("pop non-volatile registers") */
 	return stack_pointer;
 }
 

stackman/platforms/switch_x64_msvc.asm

@@ -49,7 +49,7 @@ NESTED_ENTRY stackman_switch, _TEXT$00
 	.allocstack 20h
 .endprolog
 
-	;save argments in nonvolatile registers
+	;save arguments in non-volatile registers
 	mov r12, rcx ;callback
 	mov r13, rdx ;context
 
@@ -111,7 +111,7 @@ stackman_call PROC FRAME
     .setframe rbp, 00h
     .endprolog
 
-	; suffle arguments into volatile registers
+	; shuffle arguments into volatile registers
 	mov rax, rcx ; callback
 	mov rcx, rdx ; context into first arg
 	mov r9, r8   ; and stack pointer in volatile registers

stackman/stackman_impl.h

@@ -8,7 +8,7 @@
  * defines:
  * STACKMAN_LINKAGE_STATIC - define to provide static linkage to stackman_switch()
  * 
- * See also stackman.h for main incle api
+ * See also stackman.h for main include api
  */
 
 #define STACKMAN_SWITCH_IMPL

stackman/stackman_switch.h

@@ -55,7 +55,7 @@
  * stack pointer.
  *
  * The implementation must simply:
- * 1) store all platform and cpu state on the stack (callee-stored
+ * 1) store all platform and cpu state on the stack (callee-saved
  *    registers, exception state, etc)
  * 2) call the callback with the context, opcode STACKMAN_OP_SAVE and
  *    the current stack pointer. This allows the application to do additional
@@ -92,7 +92,7 @@ typedef enum stackman_op_t {
 	STACKMAN_OP_SAVE = 0,
 
 	/* The callback receives the new stack pointer and should restore
-	 * any state for it, e.g. fillint the stack with the correct data.
+	 * any state for it, e.g. filling the stack with the correct data.
 	 * what it returns will be the return value from stackman_switch().
 	 */
 	STACKMAN_OP_RESTORE = 1,

tests/test.c

@@ -9,9 +9,9 @@
 
 #define assert_align(p) assert((intptr_t)(p) == STACKMAN_SP_ALIGN(p))
 
-/* simple test ithout modifying stack pointers.
- * test that the callback is called wiht valid
- * stackpoiners and the stage member in the 
+/* simple test without modifying stack pointers.
+ * test that the callback is called with valid
+ * stack pointers and the stage member in the
  * correct order.
  */
 typedef struct ctxt01

tests/test_cc.cc

@@ -6,9 +6,9 @@
 #include <iostream>
 using namespace std;
 
-/* simple test ithout modifying stack pointers.
- * test that the callback is called wiht valid
- * stackpoiners and the stage member in the 
+/* simple test without modifying stack pointers.
+ * test that the callback is called with valid
+ * stack pointers and the stage member in the 
  * correct order.
  */
 typedef struct ctxt01