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[Qemu-devel] [Bug 657006] Re: arm v7M - svc insn doesn't trigger PendSV
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [Bug 657006] Re: arm v7M - svc insn doesn't trigger PendSV handler |
Date: |
Thu, 26 Oct 2017 13:13:06 -0000 |
Triaging old bug tickets... can you still reproduce this issue with the
latest version of QEMU? Or could we close this ticket nowadays?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/657006
Title:
arm v7M - svc insn doesn't trigger PendSV handler
Status in QEMU:
Incomplete
Bug description:
The svc instruction doesn't work as expected.
-> qemu 0.13.0 rc1 (git)
Test : demo with freeRTOS (for example
FreeRTOS-6.0.5/Demo/CORTEX_LM3S811_GCC) with the card lm3s811evb.
If we start the scheduler, it will call that function (__attribute__
(( naked ))) :
void vPortStartFirstTask( void )
{
__asm volatile(
" ldr r0, =0xE000ED08 \n" /*
Use the NVIC offset register to locate the stack. */
" ldr r0, [r0]
\n"
" ldr r0, [r0]
\n"
" msr msp, r0
\n" /* Set the msp back to the start of the stack. */
" svc 0
\n" /* System call to start first task. */
);
}
The 4 first lines in asm work fine. The scv 0 call will rise the right
interrupt in qemu (line 151, in arm_gic.c, best_irq = 15). However, it will
never call the PendSV Handler (xPortPendSVHandler here). This function is
recorded in the nvic vector.
Next, (after the svc), the processor will execute the line after in code
(this is a naked function) so the next function written after
vPortStartFirstTask in the code.
command line :
console 1 : qemu-system-arm -M lm3s6965evb -kernel gcc/RTOSDemo.axf -s -S
console 2 : arm-none-eabi-gdb -ex "target remote localhost:1234"
gcc/RTOSDemo.axf
arm-none-eabi from
http://www.codesourcery.com/sgpp/lite/arm/portal/release1294
Same error with another project with arm-elf
processor : arm cortex m3
host : gentoo (2.6.35-r9) (without kqemu)
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