libs/rt-thread-official
libs
/
rt-thread-official
mirror of https://github.com/RT-Thread/rt-thread.git
4
0
Fork 0
Code Issues Releases Wiki Activity

protect floating point registers before enter interrupt function, then the floating point calculation will be safe in interrupt function.

This commit is contained in:
ericQiang 2023-09-15 16:59:03 +08:00
parent ec9bbaceda
commit 321e891823
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libcpu/arm/cortex-a/context_gcc.S
View File

@ -97,7 +97,9 @@ rt_hw_context_switch:
tst r6, #(1<<30)
beq 1f
vstmdb sp!, {d0-d15}
vstmdb sp!, {d16-d31}
#ifdef RT_USING_VFPD32 /*there art 32 double float registers to save*/
vstmdb sp!, {d16-d31} @ save the upper 16 registers
#endif
vmrs r5, fpscr
stmfd sp!, {r5}
1:
@ -237,7 +239,9 @@ rt_hw_context_switch_exit:
beq 1f
ldmfd sp!, {r5}
vmsr fpscr, r5
vldmia sp!, {d16-d31}
#ifdef RT_USING_VFPD32 /*there art 32 double float registers to restore*/
vldmia sp!, {d16-d31} @ restore the upper 16 registers
#endif
vldmia sp!, {d0-d15}
1:
#endif

21
libcpu/arm/cortex-a/start_gcc.S
View File

@ -458,13 +458,30 @@ vector_irq:
#else
stmfd sp!, {r0-r12,lr}
#ifdef RT_USING_FPU
vstmdb sp!, {d0-d15}
#ifdef RT_USING_VFPD32 /*there art 32 double float registers to save*/
vstmdb sp!, {d16-d31} @ save the upper 16 registers
#endif
vmrs r5, fpscr
stmfd sp!, {r5}
#endif
bl rt_interrupt_enter
bl rt_hw_trap_irq
bl rt_interrupt_leave
/* if rt_thread_switch_interrupt_flag set, jump to
* rt_hw_context_switch_interrupt_do and don't return */
#ifdef RT_USING_FPU
ldmfd sp!, {r5}
vmsr fpscr, r5
#ifdef RT_USING_VFPD32 /*there art 32 double float registers to restore*/
vldmia sp!, {d16-d31} @ restore the upper 16 registers
#endif
vldmia sp!, {d0-d15}
#endif
@ if rt_thread_switch_interrupt_flag set, jump to
@ rt_hw_context_switch_interrupt_do and don't return
ldr r0, =rt_thread_switch_interrupt_flag
ldr r1, [r0]
cmp r1, #1