ee3eaee6a1
The svc instruction doesn't exist on v7m processors. Semihosting ops are invoked with the bkpt instruction instead. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
45 lines
692 B
ArmAsm
45 lines
692 B
ArmAsm
#include <linux/linkage.h>
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#include <asm/assembler.h>
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#ifndef CONFIG_DEBUG_SEMIHOSTING
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#include CONFIG_DEBUG_LL_INCLUDE
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ENTRY(putc)
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addruart r1, r2, r3
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waituart r3, r1
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senduart r0, r1
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busyuart r3, r1
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mov pc, lr
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ENDPROC(putc)
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#else
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ENTRY(putc)
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adr r1, 1f
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ldmia r1, {r2, r3}
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add r2, r2, r1
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ldr r1, [r2, r3]
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strb r0, [r1]
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mov r0, #0x03 @ SYS_WRITEC
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ARM( svc #0x123456 )
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#ifdef CONFIG_CPU_V7M
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THUMB( bkpt #0xab )
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#else
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THUMB( svc #0xab )
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#endif
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mov pc, lr
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.align 2
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1: .word _GLOBAL_OFFSET_TABLE_ - .
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.word semi_writec_buf(GOT)
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ENDPROC(putc)
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.bss
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.global semi_writec_buf
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.type semi_writec_buf, %object
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semi_writec_buf:
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.space 4
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.size semi_writec_buf, 4
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#endif
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