提交 d2fae548 编写于 作者: R Rusty Russell 提交者: Anton Blanchard

powerpc: modules: change r2 save/restore offset for ELFv2 ABI.

ELFv2 uses a different stack offset (24 vs 40) to save r2.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
上级 5b12c5c6
......@@ -41,6 +41,12 @@
#define DEBUGP(fmt , ...)
#endif
#if defined(_CALL_ELF) && _CALL_ELF == 2
#define R2_STACK_OFFSET 24
#else
#define R2_STACK_OFFSET 40
#endif
/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
the kernel itself). But on PPC64, these need to be used for every
jump, actually, to reset r2 (TOC+0x8000). */
......@@ -61,14 +67,14 @@ struct ppc64_stub_entry
r2) into the stub. */
static struct ppc64_stub_entry ppc64_stub =
{ .jump = {
0x3d820000, /* addis r12,r2, <high> */
0x398c0000, /* addi r12,r12, <low> */
0x3d820000, /* addis r12,r2, <high> */
0x398c0000, /* addi r12,r12, <low> */
/* Save current r2 value in magic place on the stack. */
0xf8410028, /* std r2,40(r1) */
0xe96c0020, /* ld r11,32(r12) */
0xe84c0028, /* ld r2,40(r12) */
0x7d6903a6, /* mtctr r11 */
0x4e800420 /* bctr */
0xf8410000|R2_STACK_OFFSET, /* std r2,R2_STACK_OFFSET(r1) */
0xe96c0020, /* ld r11,32(r12) */
0xe84c0028, /* ld r2,40(r12) */
0x7d6903a6, /* mtctr r11 */
0x4e800420 /* bctr */
} };
/* Count how many different 24-bit relocations (different symbol,
......@@ -338,7 +344,8 @@ static int restore_r2(u32 *instruction, struct module *me)
me->name, *instruction);
return 0;
}
*instruction = 0xe8410028; /* ld r2,40(r1) */
/* ld r2,R2_STACK_OFFSET(r1) */
*instruction = 0xe8410000 | R2_STACK_OFFSET;
return 1;
}
......
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