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[FT32] fixes for the default hardware startup 

libgcc/
        * config/ft32/crti-hw.S: Use __PMSIZE to allow configurable
        memory layout. Deal correctly with BSS region larger than 32K.
        Handle a watchdog reset like a power-on reset. Clean up unused
        code.

From-SVN: r227986
This commit is contained in:
James Bowman 2015-09-21 22:31:53 +00:00 committed by James Bowman
parent 6ff560cc25
commit 131314e14a
2 changed files with 33 additions and 27 deletions
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7
libgcc/ChangeLog
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@ -1,3 +1,10 @@
2015-09-21 James Bowman <james.bowman@ftdichip.com>
* config/ft32/crti-hw.S: Use __PMSIZE to allow configurable
memory layout. Deal correctly with BSS region larger than 32K.
Handle a watchdog reset like a power-on reset. Clean up unused
code.
2015-09-18 Andrew Dixie <andrewd@gentrack.com>
David Edelsohn <dje.gcc@gmail.com>

53
libgcc/config/ft32/crti-hw.S
View File

@ -1,11 +1,8 @@
.equ SYS_REGMSC0CFG_B3 , 0x1001b
.equ SYS_REGIRQCTL_B3 , 0x100e3
.global _start
_start:
# START Interrupt Vector Table [[
jmp 0x3fffc # RESET Vector
jmp _watchdog_isr # WATCHDOG Vector # TODO: Change me to reset the chip proper
jmp __PMSIZE-4
jmp watchdog_init
jmp interrupt_0
jmp interrupt_1
jmp interrupt_2
@ -38,64 +35,66 @@ _start:
jmp interrupt_29
jmp interrupt_30
jmp interrupt_31
jmp 0x3fff8
jmp __PMSIZE-8
# ]] END Interrupt Vector Table
codestart:
jmp init
.global _exithook
_exithook: # Debugger uses '_exithook' at 0x90 to catch program exit
return
watchdog_init:
ldk $r0,1
init:
ldk $sp,__RAMSIZE
# Disable all interrupts
ldk $r0,0x80
sta.b 0x100e3,$r0
# Reset all peripherals
# lda.l $r0, 0x10018
# bins.l $r0, $r0, 0x23F # Set bit 31
# sta.l 0x10018, $r0
ldk $r4,0x80
sta.b 0x100e3,$r4
# Initialize DATA by copying from program memory
ldk.l $r0,__data_load_start
ldk.l $r4,__data_load_start
ldk.l $r1,__data_load_end
ldk.l $r2,0 # Will use __data after binutils patch
jmp .dscopy
.dsloop:
# Copy PM[$r0] to RAM $r2
lpmi.l $r3,$r0,0
# Copy PM[$r4] to RAM $r2
lpmi.l $r3,$r4,0
sti.l $r2,0,$r3
add.l $r0,$r0,4
add.l $r4,$r4,4
add.l $r2,$r2,4
.dscopy:
cmp.l $r0,$r1
cmp.l $r4,$r1
jmpc lt,.dsloop
# Zero BSS
ldk.l $r0,_bss_start
ldk.l $r4,_bss_start
ldk.l $r2,_end
sub.l $r2,$r2,$r0
sub.l $r2,$r2,$r4
ldk.l $r1,0
memset.l $r0,$r1,$r2
ldk $r3,32764
1:
cmp $r2,$r3
jmpc lt,2f
memset $r4,$r1,$r3
add $r4,$r4,$r3
sub $r2,$r2,$r3
jmp 1b
2:
memset $r4,$r1,$r2
sub.l $sp,$sp,24 # Space for the caller argument frame
call main
.equ EXITEXIT , 0x1fffc
.equ EXITEXIT,0x1fffc
.global _exit
_exit:
sta.l EXITEXIT,$r0 # simulator end of test
jmp _exithook
_watchdog_isr:
ldk.l $sp, 0x80FFFF # Reset the stack pointer so it doesn't grow to a huge size
jmp 0
# Macro to construct the interrupt stub code.
# it just saves r0, loads r0 with the int vector
# and branches to interrupt_common.