diff --git a/arch/arc/core/prep_c.c b/arch/arc/core/prep_c.c
index f0b31a2bb36..a3608717969 100644
--- a/arch/arc/core/prep_c.c
+++ b/arch/arc/core/prep_c.c
@@ -88,7 +88,7 @@ extern FUNC_NORETURN void z_cstart(void);
  * This routine prepares for the execution of and runs C code.
  */
 
-void _PrepC(void)
+void z_prep_c(void)
 {
 	z_bss_zero();
 #ifdef __CCAC__
diff --git a/arch/arc/core/reset.S b/arch/arc/core/reset.S
index ba29f44051b..82ea4c4d435 100644
--- a/arch/arc/core/reset.S
+++ b/arch/arc/core/reset.S
@@ -40,7 +40,7 @@ GTEXT(__start)
  *
  * Locking interrupts prevents anything from interrupting the CPU.
  *
- * When these steps are completed, jump to _PrepC(), which will finish setting
+ * When these steps are completed, jump to z_prep_c(), which will finish setting
  * up the system for running C code.
  */
 
@@ -202,4 +202,4 @@ _master_core_startup:
 	jl z_arc_firq_stack_set
 #endif
 
-	j _PrepC
+	j z_prep_c
diff --git a/arch/arc/include/vector_table.h b/arch/arc/include/vector_table.h
index fc828c7ddaf..1d7b1ca1220 100644
--- a/arch/arc/include/vector_table.h
+++ b/arch/arc/include/vector_table.h
@@ -46,7 +46,7 @@ GTEXT(__ev_div_zero)
 GTEXT(__ev_dc_error)
 GTEXT(__ev_maligned)
 
-GTEXT(_PrepC)
+GTEXT(z_prep_c)
 GTEXT(_isr_wrapper)
 
 #else
diff --git a/arch/mips/core/prep_c.c b/arch/mips/core/prep_c.c
index 6f72699cc5b..19673273b8a 100644
--- a/arch/mips/core/prep_c.c
+++ b/arch/mips/core/prep_c.c
@@ -42,7 +42,7 @@ static void interrupt_init(void)
  * @return N/A
  */
 
-void _PrepC(void)
+void z_prep_c(void)
 {
 	z_bss_zero();
 
diff --git a/arch/mips/core/reset.S b/arch/mips/core/reset.S
index 8daebf85d4a..eec75bc031b 100644
--- a/arch/mips/core/reset.S
+++ b/arch/mips/core/reset.S
@@ -11,7 +11,7 @@
 
 GTEXT(__initialize)
 GTEXT(__stack)
-GTEXT(_PrepC)
+GTEXT(z_prep_c)
 
 /*
  * Remainder of asm-land initialization code before we can jump into
@@ -52,6 +52,6 @@ aa_loop:
 	/*
 	 * Jump into C domain.
 	 */
-	la v0, _PrepC
+	la v0, z_prep_c
 	jal v0
 	nop /* delay slot */
diff --git a/arch/nios2/core/crt0.S b/arch/nios2/core/crt0.S
index 8ecb37fe926..2f708bf26f4 100644
--- a/arch/nios2/core/crt0.S
+++ b/arch/nios2/core/crt0.S
@@ -12,7 +12,7 @@ GTEXT(__start)
 GTEXT(__reset)
 
 /* imports */
-GTEXT(_PrepC)
+GTEXT(z_prep_c)
 GTEXT(z_interrupt_stacks)
 
 	/* Allow use of r1/at (the assembler temporary register) in this
@@ -140,7 +140,7 @@ SECTION_FUNC(TEXT, __start)
 	 * GH-1821
 	 */
 
-	/* Jump into C domain. _PrepC zeroes BSS, copies rw data into RAM,
+	/* Jump into C domain. z_prep_c zeroes BSS, copies rw data into RAM,
 	 * and then enters z_cstart */
-	call _PrepC
+	call z_prep_c
 
diff --git a/arch/nios2/core/prep_c.c b/arch/nios2/core/prep_c.c
index da8fcd9d4bc..74a3454af48 100644
--- a/arch/nios2/core/prep_c.c
+++ b/arch/nios2/core/prep_c.c
@@ -28,7 +28,7 @@
  * This routine prepares for the execution of and runs C code.
  */
 
-void _PrepC(void)
+void z_prep_c(void)
 {
 	z_bss_zero();
 	z_data_copy();
diff --git a/arch/riscv/core/prep_c.c b/arch/riscv/core/prep_c.c
index 8b9b118b24c..37835402fba 100644
--- a/arch/riscv/core/prep_c.c
+++ b/arch/riscv/core/prep_c.c
@@ -27,7 +27,7 @@
  * This routine prepares for the execution of and runs C code.
  */
 
-void _PrepC(void)
+void z_prep_c(void)
 {
 	z_bss_zero();
 	z_data_copy();
diff --git a/arch/riscv/core/reset.S b/arch/riscv/core/reset.S
index e2faa6fe94d..73e2bf923a2 100644
--- a/arch/riscv/core/reset.S
+++ b/arch/riscv/core/reset.S
@@ -16,7 +16,7 @@ GTEXT(__initialize)
 GTEXT(__reset)
 
 /* imports */
-GTEXT(_PrepC)
+GTEXT(z_prep_c)
 GTEXT(riscv_cpu_wake_flag)
 GTEXT(riscv_cpu_sp)
 GTEXT(z_riscv_secondary_cpu_init)
@@ -86,10 +86,10 @@ aa_loop:
 #endif
 
 	/*
-	 * Jump into C domain. _PrepC zeroes BSS, copies rw data into RAM,
+	 * Jump into C domain. z_prep_c zeroes BSS, copies rw data into RAM,
 	 * and then enters kernel z_cstart
 	 */
-	call _PrepC
+	call z_prep_c
 
 boot_secondary_core:
 #if CONFIG_MP_MAX_NUM_CPUS > 1
diff --git a/arch/sparc/core/prep_c.c b/arch/sparc/core/prep_c.c
index 6858b2fb1fb..9ad3955a190 100644
--- a/arch/sparc/core/prep_c.c
+++ b/arch/sparc/core/prep_c.c
@@ -17,7 +17,7 @@
  * This routine prepares for the execution of and runs C code.
  */
 
-void _PrepC(void)
+void z_prep_c(void)
 {
 	z_data_copy();
 	z_cstart();
diff --git a/arch/sparc/core/reset_trap.S b/arch/sparc/core/reset_trap.S
index 66b5aafcf26..dd4046c47bc 100644
--- a/arch/sparc/core/reset_trap.S
+++ b/arch/sparc/core/reset_trap.S
@@ -48,7 +48,7 @@ SECTION_FUNC(TEXT, __sparc_trap_reset)
 	call	z_bss_zero
 	 nop
 
-	call    _PrepC
+	call    z_prep_c
 	 nop
 
 /* We halt the system by generating a "trap in trap" condition. */
diff --git a/boards/nios2/altera_max10/doc/index.rst b/boards/nios2/altera_max10/doc/index.rst
index 302c10c1cff..db4daf5256a 100644
--- a/boards/nios2/altera_max10/doc/index.rst
+++ b/boards/nios2/altera_max10/doc/index.rst
@@ -233,7 +233,7 @@ You will see output similar to the following:
    Listening on port 3335 for connection from GDB: accepted
    isr_tables_syms () at /projects/zephyr/arch/common/isr_tables.c:63
    63      GEN_ABSOLUTE_SYM(__ISR_LIST_SIZEOF, sizeof(struct _isr_list));
-   (gdb) b _PrepC
+   (gdb) b z_prep_c
    Breakpoint 1 at 0xdf0: file /projects/zephyr/arch/nios2/core/prep_c.c, line 36.
    (gdb) b z_cstart
    Breakpoint 2 at 0x1254: file /projects/zephyr/kernel/init.c, line 348.