[sw] cleanup and update software framework

CHANGELOG.md

@@ -31,6 +31,7 @@ mimpid = 0x01040312 => Version 01.04.03.12 => v1.4.3.12
 
 | Date (*dd.mm.yyyy*) | Version | Comment |
 |:-------------------:|:-------:|:--------|
+| 21.01.2023 | 1.7.9.10 | update software framework; :bug: fix bug in constructor calling in `crt0` start-up code; [#478](https://github.com/stnolting/neorv32/pull/478) |
 | 15.01.2023 | 1.7.9.9 | :warning: rework **CPU counters**; remove `mtime_i/o` top entity ports; remove `time[h]` CSRs; [#477](https://github.com/stnolting/neorv32/pull/477) |
 | 14.01.2023 | 1.7.9.8 | minor CPU control edits, optimizations and fixes; [#476](https://github.com/stnolting/neorv32/pull/476) |
 | 10.01.2023 | 1.7.9.7 | :warning: rework **watchdog timer (WDT)**; [#474](https://github.com/stnolting/neorv32/pull/474) |

docs/datasheet/software.adoc

@@ -482,25 +482,21 @@ and placed right before the actual application code so it gets executed right af
 The `crt0.S` start-up performs the following operations:
 
 [start=1]
-. Disable interrupts globally by clearing <<_mstatus>> (including `mie`).
-. Initialize all integer registers `x1 - x31` (or just `x1 - x15` when using the `E` CPU extension is enabled) to a defined value.
-. Initialize all CPU core CSRs and also install a default "dummy" trap handler for _all_ exceptions. This is used for the very early boot
-phase where the application might not provide a trap handling yet.
-** Clear <<_mstatus>>`.
-** Clear <<_mie>> disabling all interrupt sources and clearing all pending interrupts.
-** Clear <<_cycleh>> and <<_instreth>> counter CSRs.
+. Clear <<_mstatus>>.
+. Clear <<_mie>> disabling all interrupt sources.
+. Install an early-boot dummy trap handler to <<_mtvec>>.
 . Initialize the global pointer `gp` and the stack pointer `sp` according to the <<_ram_layout>> provided by the linker script.
-during the early boot phase.
-. Clear the `.bss` section defined by the linker script.
-. Copy read-only data from the `.text` section to the `.data` section to set initialized variables.
-. Call and execute all _constructors_ (if there are any).
+. Initialize all integer register `x1 - x31` (only `x1 - x15` if the `E` CPU extension is enabled).
+. Setup `.data` section to configure initialized variables.
+. Clear the `.bss` section.
+. Call all _constructors_ (if there are any).
 . Call the application's `main` function (with no arguments: `argc` = `argv` = 0).
 . If `main` returns:
-** interrupts are disabled by clearing all IRQ sources <<_mie>.
-** `mains`'s return value is copied to the <<_mscratch>> CSR to allow inspection by the on-chip debugger.
-** call and execute all _destructors_ (if there are any).
-** an optional <<_after_main_handler>> is called (if defined at all).
-** the CPU enters sleep mode (using the `wfi` instruction) or remains in an endless loop (if `wfi` "returns").
+** Tnterrupts are disabled by clearing <<_mie>>.
+** `mains`'s return value is copied to the <<_mscratch>> CSR to allow inspection by the debugger.
+** Call all _destructors_ (if there are any).
+** An optional <<_after_main_handler>> is called (if defined at all).
+** The CPU enters sleep mode (using the `wfi` instruction) or remains in an endless loop (if `wfi` "returns").
 
 .Bootloader Start-Up Code
 [NOTE]

rtl/core/neorv32_application_image.vhd

@@ -1,31 +1,28 @@
 -- The NEORV32 RISC-V Processor: https://github.com/stnolting/neorv32
 -- Auto-generated memory initialization file (for APPLICATION) from source file <demo_blink_led/main.bin>
--- Size: 1004 bytes
+-- Size: 1076 bytes
 -- MARCH: default
--- Built: 09.01.2023 19:30:00
+-- Built: 21.01.2023 15:20:33
 
 -- prototype defined in 'neorv32_package.vhd'
 package body neorv32_application_image is
 
 constant application_init_image : mem32_t := (
 x"30005073",
+x"30401073",
+x"00000097",
+x"12408093",
+x"30509073",
 x"80002117",
-x"ff810113",
+x"fe810113",
 x"80000197",
-x"7f418193",
-x"00000517",
-x"12450513",
-x"30551073",
-x"30001073",
-x"30401073",
-x"b0001073",
-x"b8001073",
-x"b0201073",
-x"b8201073",
+x"7e418193",
 x"00000213",
 x"00000293",
 x"00000313",
 x"00000393",
+x"00000413",
+x"00000493",
 x"00000813",
 x"00000893",
 x"00000913",
@@ -42,11 +39,11 @@ x"00000e13",
 x"00000e93",
 x"00000f13",
 x"00000f93",
-x"3ec00593",
+x"43400593",
 x"80000617",
-x"f7460613",
+x"f8060613",
 x"80000697",
-x"f6c68693",
+x"f7868693",
 x"00c58e63",
 x"00d65c63",
 x"0005a703",
@@ -55,17 +52,17 @@ x"00458593",
 x"00460613",
 x"fedff06f",
 x"80000717",
-x"f4870713",
+x"f5470713",
 x"80000797",
-x"f4078793",
+x"f4c78793",
 x"00f75863",
 x"00072023",
 x"00470713",
 x"ff5ff06f",
-x"3ec00413",
-x"3ec00493",
+x"43400413",
+x"43400493",
 x"00945a63",
-x"0009a083",
+x"00042083",
 x"000080e7",
 x"00440413",
 x"ff1ff06f",
@@ -74,8 +71,8 @@ x"00000593",
 x"088000ef",
 x"30401073",
 x"34051073",
-x"3ec00413",
-x"3ec00493",
+x"43400413",
+x"43400493",
 x"00945a63",
 x"00042083",
 x"000080e7",
@@ -110,45 +107,52 @@ x"00000513",
 x"00000593",
 x"00112623",
 x"00812423",
-x"0e0000ef",
+x"134000ef",
 x"00000513",
 x"00150413",
 x"00000593",
 x"0ff57513",
-x"0cc000ef",
+x"120000ef",
 x"0fa00513",
-x"020000ef",
+x"034000ef",
 x"00040513",
 x"fe5ff06f",
 x"f9402583",
 x"f9002503",
 x"f9402783",
 x"fef59ae3",
 x"00008067",
+x"c80027f3",
+x"c0002573",
+x"c80025f3",
+x"fef59ae3",
+x"00008067",
 x"fe010113",
 x"00a12623",
 x"fe002503",
 x"3e800593",
 x"00112e23",
 x"00812c23",
 x"00912a23",
-x"150000ef",
+x"190000ef",
 x"00c12603",
 x"00000693",
 x"00000593",
-x"0ac000ef",
-x"fe802783",
-x"00020737",
+x"0ec000ef",
 x"00050413",
-x"00e7f7b3",
 x"00058493",
-x"02078e63",
-x"fa5ff0ef",
+x"fc0027f3",
+x"0807f793",
+x"04078463",
+x"320027f3",
+x"0017f793",
+x"02079e63",
+x"f9dff0ef",
 x"00850433",
 x"00a43533",
 x"009585b3",
 x"00b504b3",
-x"f91ff0ef",
+x"f89ff0ef",
 x"fe95eee3",
 x"00b49463",
 x"fe856ae3",
@@ -157,15 +161,29 @@ x"01812403",
 x"01412483",
 x"02010113",
 x"00008067",
-x"01c59493",
-x"00455513",
-x"00a4e533",
-x"00050a63",
-x"00050863",
-x"fff50513",
+x"fe802783",
+x"00020737",
+x"00e7f7b3",
+x"02078663",
+x"f41ff0ef",
+x"00850433",
+x"00a43533",
+x"009585b3",
+x"00b504b3",
+x"f2dff0ef",
+x"fe95eee3",
+x"fcb490e3",
+x"fe856ae3",
+x"fb9ff06f",
+x"01c49493",
+x"00445413",
+x"0084e433",
+x"00040a63",
+x"00040863",
+x"fff40413",
 x"00000013",
 x"ff1ff06f",
-x"fcdff06f",
+x"f95ff06f",
 x"fc000793",
 x"00a7a423",
 x"00b7a623",