Re: [arm-gnu] thumb code calling arm subroutine causes undefined insn exception

["Andrew Kohlsmith (mailing lists account)" <aklists@xxxxxxxxxx>]

On Sunday 25 April 2010 10:43:51 pm Mark Mitchell wrote:
> Andrew Kohlsmith (mailing lists account) wrote:
> > Since I am already using -mcpu=arm7tdmi, would this indicate that there
> > is a bug in the compiler wherein it is assuming that the BLX instruction
> > exists on the ARM7TDMI/TDMI-S?

> Please post your exact options for all of (a) code compiled with
> GCC/G++, (b) code assembled with GAS, (c) link line.

For thumb code:
arm-none-eabi-gcc -o main.o -c -std=gnu99 -g -Os -fno-builtin -nostdlib -
mcpu=arm7tdmi-s -march=armv4t -mthumb -mthumb-interwork -DNDEBUG -ffunction-
sections -fdata-sections main.c

For ARM code (irq handler):
arm-none-eabi-gcc -o irq.o -c -std=gnu99 -g -Os -fno-builtin -nostdlib -
mcpu=arm7tdmi-s -march=armv4t -mthumb-interwork -DNDEBUG -ffunction-sections -
fdata-sections irq.c

arm-none-eabi-as -o boot.o boot.s

arm-none-eabi-gcc -o kernel_test -std=gnu99 -g -Os -fno-builtin -nostdlib -
mcpu=arm7tdmi-s -march=armv4t -mthumb -mthumb-interwork -DNDEBUG -T rom.ld -
Wl,-Map=kernel_test.map -Wl,--cref -Wl,--gc-sections boot.o main.o irq.o

I am working on a cut-down codebase to generate this.

-A.