> On 2017-02-06, at 01:35, Bin Meng <bmeng...@gmail.com> wrote:
>
> +Simon,
>
> I do not have a GCC5 toolchain to test this. I suspect this is only
> exposed with GCC5, or GCC 5.4? Is there any parameter to control the
> behavior?
I observed a similar behavior with GCC 5.3.
As an experiment, I disabled CONFIG_CC_OPTIMIZE_FOR_SIZE. This did not change
the sizes; the handler for IRQs 0 through 19 were still 4 bytes while the rest
were 7 bytes.
Although I am not an expert x86 assembly writer, I was able to force the
assembler to generate 32-bit jumps with the following:
diff --git a/arch/x86/cpu/interrupts.c b/arch/x86/cpu/interrupts.c
index 5f6cdd3..9917d09 100644
--- a/arch/x86/cpu/interrupts.c
+++ b/arch/x86/cpu/interrupts.c
@@ -32,7 +32,7 @@ DECLARE_GLOBAL_DATA_PTR;
".type irq_"#x", @function\n" \
"irq_"#x":\n" \
"pushl $"#x"\n" \
- "jmp irq_common_entry\n"
+ "jmp.d32 irq_common_entry\n"
static char *exceptions[] = {
"Divide Error",
This worked for both GCC 5.4 and 4.9.
--
Jason Tang / t...@jtang.org
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