diff options
Diffstat (limited to 'src/arch/arm/armv7/bootblock.S')
| -rw-r--r-- | src/arch/arm/armv7/bootblock.S | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/src/arch/arm/armv7/bootblock.S b/src/arch/arm/armv7/bootblock.S index a8d097303..4258caf43 100644 --- a/src/arch/arm/armv7/bootblock.S +++ b/src/arch/arm/armv7/bootblock.S @@ -32,6 +32,7 @@ #include <arch/asm.h> .section ".start", "a", %progbits +.arm ENTRY(_start) /* * Set the cpu to System mode with IRQ and FIQ disabled. Prefetch/Data @@ -40,7 +41,11 @@ ENTRY(_start) * causes it. */ msr cpsr_cxf, #0xdf + bl _thumb_start +ENDPROC(_start) +.thumb +ENTRY(_thumb_start) /* * From Cortex-A Series Programmer's Guide: * Only CPU 0 performs initialization. Other CPUs go into WFI @@ -72,25 +77,17 @@ call_bootblock: ldr sp, .Stack /* Set up stack pointer */ ldr r0,=0x00000000 /* - * The current design of cpu_info places the - * struct at the top of the stack. The number of - * words pushed must be at least as large as that - * struct. + * The current design of cpu_info places the struct at the top of the + * stack. Free enough space to accomodate for that, but make sure it's + * 8-byte aligned for ABI compliance. */ - push {r0-r2} - bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ - /* - * Use "bl" instead of "b" even though we do not intend to return. - * "bl" gets compiled to "blx" if we're transitioning from ARM to - * Thumb. However, "b" will not and GCC may attempt to create a - * wrapper which is currently broken. - */ + sub sp, sp, #16 bl main wait_for_interrupt: wfi mov pc, lr @ back to my caller -ENDPROC(_start) +ENDPROC(_thumb_start) /* we do it this way because it's a 32-bit constant and * in some cases too far away to be loaded as just an offset |