minor bootloader tweaks

sw/bootloader/Makefile

@@ -81,9 +81,10 @@ $(BUILD_DIR)/bootloader.elf: $(OBJS) N64.ld
 	@$(OBJDUMP) -S $@ > $(BUILD_DIR)/bootloader.lst
 
 $(BUILD_DIR)/bootloader.bin: $(BUILD_DIR)/bootloader.elf
-	@$(STRIP) -s $<
-	@$(N64_ELFCOMPRESS) -c 2 -o $(dir $<) $<
-	@$(N64_TOOL) --title "SC64 bootloader" --output $@ --align 256 $<
+	@cp $< $<.stripped
+	@$(STRIP) -s $<.stripped
+	@$(N64_ELFCOMPRESS) -c 2 -o $(dir $<) $<.stripped
+	@$(N64_TOOL) --title "SC64 bootloader" --output $@ --align 256 $<.stripped
 
 all: $(BUILD_DIR)/bootloader.bin
 

sw/bootloader/N64.ld

@@ -1,6 +1,7 @@
 MEMORY {
+    exception (rx)      : org = 0x80000000, len = 0x400
     ram (rwx)           : org = 0x80000400, len = 1M
-    framebuffer (rw)    : org = 0x8026A000, len = 600k
+    framebuffer (rw)    : org = 0x8016A000, len = 600k
 }
 
 ENTRY(entry_handler)
@@ -9,6 +10,10 @@ __exception_stack_size = 8k;
 __stack_size = 16k;
 
 SECTIONS {
+    .exception : {
+        KEEP(*(.text.exception_vector));
+    } > exception
+
     .text : SUBALIGN(8) {
         *(.text.entry_handler)
         *(.text .text.* .gnu.linkonce.t.*)

sw/bootloader/src/exception.S

@@ -3,10 +3,6 @@
 
 #define WATCHDOG_TIMEOUT            (5 * (93750000UL / 2))
 
-#define VECTOR_LOCATION             (0xA0000000UL)
-#define VECTOR_SIZE                 (0x80)
-#define VECTOR_NUM                  (4)
-
 #define ZR_OFFSET                   (0)
 #define AT_OFFSET                   (8)
 #define V0_OFFSET                   (16)
@@ -46,8 +42,23 @@
 #define SAVE_REGISTERS_SIZE         (280)
 
 
+.section .text.exception_vector
+exception_tlb_miss:
+    .org 0x0000
+    j exception_handler
+
+exception_xtlb_miss:
+    .org 0x0080
+    j exception_handler
+
+exception_other:
+    .org 0x0180
+    j exception_handler
+
+
 .section .text.exception_handler
 exception_handler:
+    .type exception_handler, %function
     .set noat
     la $k0, (_esp - SAVE_REGISTERS_SIZE)
     sd $zero, ZR_OFFSET($k0)
@@ -153,48 +164,9 @@ exception_restore:
     eret
 
 
-.section .text.exception_vector
-exception_vector:
-    .set noreorder
-    la $k0, exception_handler
-    jalr $k1, $k0
-    nop
-    .equ exception_vector_size, (. - exception_vector)
-    .set reorder
-
-
-.section .text.exception_install
-exception_install:
-    .global exception_install
-    la $t0, exception_vector
-    li $t1, VECTOR_LOCATION
-    li $t2, (VECTOR_SIZE * VECTOR_NUM)
-    add $t2, $t2, $t1
-1:
-    move $t3, $t0
-    move $t4, $t1
-    li $t5, exception_vector_size
-    add $t5, $t5, $t4
-2:
-    lw $t6, 0($t3)
-    addiu $t3, 4
-    sw $t6, 0($t4)
-    addiu $t4, 4
-    bne $t4, $t5, 2b
-    addiu $t1, VECTOR_SIZE
-    bne $t1, $t2, 1b
-    li $t0, VECTOR_LOCATION
-    li $t1, (VECTOR_SIZE * VECTOR_NUM)
-    add $t1, $t0, $t1
-3:
-    cache HIT_INVALIDATE_I, 0($t0)
-    addiu $t0, CACHE_LINE_SIZE_I
-    bne $t0, $t1, 3b
-    jr $ra
-
-
 .section .text.exception_enable_interrupts
 exception_enable_interrupts:
+    .type exception_enable_interrupts, %function
     .global exception_enable_interrupts
     mfc0 $t0, C0_STATUS
     li $t1, C0_SR_IE
@@ -205,6 +177,7 @@ exception_enable_interrupts:
 
 .section .text.exception_disable_interrupts
 exception_disable_interrupts:
+    .type exception_disable_interrupts, %function
     .global exception_disable_interrupts
     mfc0 $t0, C0_STATUS
     li $t1, ~(C0_SR_IE)
@@ -215,6 +188,7 @@ exception_disable_interrupts:
 
 .section .text.exception_enable_watchdog
 exception_enable_watchdog:
+    .type exception_enable_watchdog, %function
     .global exception_enable_watchdog
     mtc0 $zero, C0_COUNT
     li $t1, WATCHDOG_TIMEOUT
@@ -228,6 +202,7 @@ exception_enable_watchdog:
 
 .section .text.exception_disable_watchdog
 exception_disable_watchdog:
+    .type exception_disable_watchdog, %function
     .global exception_disable_watchdog
     mfc0 $t0, C0_STATUS
     li $t1, ~(C0_SR_IM7)

sw/bootloader/src/exception.h

@@ -7,7 +7,6 @@
 #define EXCEPTION_TRIGGER(code)     { asm volatile ("syscall %[c]\n" :: [c] "i" (code)); }
 
 
-void exception_install (void);
 void exception_enable_interrupts (void);
 void exception_disable_interrupts (void);
 void exception_enable_watchdog (void);

sw/bootloader/src/init.c

@@ -16,8 +16,6 @@ void init (init_tv_type_t tv_type, init_reset_type_t reset_type) {
     __tv_type = tv_type;
     __reset_type = reset_type;
 
-    exception_install();
-
     sc64_unlock();
 
     if (!sc64_check_presence()) {