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fix issue of jumping to address 0

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This commit is contained in:
Brendan Haines
2020-11-14 23:04:24 -07:00
parent caf9a6f4f7
commit 4a25ca6def
7 changed files with 213 additions and 154 deletions
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4
test/Makefile
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@ -16,8 +16,8 @@ LDFLAGS = -T test.ld
%.o: %.c
$(CC) $(CFLAGS) $^ -o $@
%.elf: %.o
$(LD) $(LDFLAGS) $^ -o $@
%.elf: %.o %.ld
$(LD) $(LDFLAGS) $< -o $@
text.hex: test.elf
riscv64-linux-gnu-objdump -s $^ | sed -n '/.text/,$$p' | tail -n+2 | sed -n '/.data/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@

BIN
test/decoder.xlsx
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Binary file not shown.

46
test/test.S
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@ -27,7 +27,7 @@ _start:
# or
or x9, x1, x2 # x9 = 0xffffffff
or x10, x1, x0 # x10 = 0xfedcb789
or x11, x4, x3 # x11 = 0x0xfedcb79a
or x11, x4, x3 # x11 = 0xfedcb79a
# xor
xor x12, x1, x2 # x12 = 0x01234876
@ -209,27 +209,29 @@ test9:
j fail
test10:
# now for some memory stuff
# # sw
# la x9, someint # x9 = start of .bss
# li x10, 0x12345678 # x10 = 0x12345678
# nop
# nop
# nop
# nop
# nop
# sw x10, 0(x9) # someint = 0x12345678
# nop
# nop
# nop
# nop
# nop
# lw x11, 0(x9) # x11 = 0x12345678
# nop
# nop
# nop
# nop
# nop
addi x30, x0, 10 # x30 = 10
# # now for some memory stuff
# # sw
# la x9, someint # x9 = start of .bss
# lui x10, 0x12345 # x10 = 0x12345000
# addi x10, x10, 0x678 # x10 = 0x12345678
# nop
# nop
# nop
# nop
# nop
# sw x10, 0(x9) # someint = 0x12345678
# nop
# nop
# nop
# nop
# nop
# # lw x11, 0(x9) # x11 = 0x12345678
# nop
# nop
# nop
# nop
# nop
done:

10
test/test.ld
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@ -3,7 +3,7 @@ ENTRY(_start)
MEMORY
{
ROM (rx) : ORIGIN = 0x00000000, LENGTH = 1024
RAM (rwx) : ORIGIN = 0x10000000, LENGTH = 512
RAM (rwx) : ORIGIN = 0x00100000, LENGTH = 1024
/* FLASH (rx) : ORIGIN = 0x00200000, LENGTH = 512 */
}
@ -11,20 +11,20 @@ SECTIONS
{
.text :
{
. = ALIGN(4);
/* . = ALIGN(4); */
_text = .;
*(.text*)
*(.rodata*)
_etext = .;
. = ALIGN(4);
/* . = ALIGN(4); */
} > ROM
.data :
{
. = ALIGN(4);
/* . = ALIGN(4); */
_data = .;
*(.data*)
_edata = .;
. = ALIGN(4);
/* . = ALIGN(4); */
} > RAM /*AT> FLASH*/
}