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compel: Fix ppc64le parasite stack layout

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The ppc64le ABI allows functions to store data in caller frames.
When initializing the stack pointer prior to executing parasite code
we need to pre-allocating the minimum sized stack frame before
jumping to the parasite code.

Signed-off-by: Younes Manton <ymanton@ca.ibm.com>
This commit is contained in:
Younes Manton 2022-08-30 08:18:21 -07:00 • committed by Andrei Vagin
parent 17ec539132
commit a39d416568
2 changed files with 7 additions and 2 deletions
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5
compel/arch/ppc64/src/lib/include/uapi/asm/sigframe.h
View file

@ -23,6 +23,11 @@
/* Copied from the Linux kernel header arch/powerpc/include/asm/ptrace.h */
#define USER_REDZONE_SIZE 512
#if _CALL_ELF != 2
#error Only supporting ABIv2.
#else
#define STACK_FRAME_MIN_SIZE 32
#endif
/* Copied from the Linux kernel source file arch/powerpc/kernel/signal_64.c */
#define TRAMP_SIZE 6

4
compel/arch/ppc64/src/lib/infect.c
View file

@ -441,13 +441,13 @@ void *remote_mmap(struct parasite_ctl *ctl, void *addr, size_t length, int prot,
void parasite_setup_regs(unsigned long new_ip, void *stack, user_regs_struct_t *regs)
{
/*
* OpenPOWER ABI requires that r12 is set to the calling function addressi
* OpenPOWER ABI requires that r12 is set to the calling function address
* to compute the TOC pointer.
*/
regs->gpr[12] = new_ip;
regs->nip = new_ip;
if (stack)
regs->gpr[1] = (unsigned long)stack;
regs->gpr[1] = (unsigned long)stack - STACK_FRAME_MIN_SIZE;
regs->trap = 0;
}