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Diffstat (limited to 'roms/skiboot/include/stack.h')
| -rw-r--r-- | roms/skiboot/include/stack.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/roms/skiboot/include/stack.h b/roms/skiboot/include/stack.h new file mode 100644 index 000000000..3e987ea81 --- /dev/null +++ b/roms/skiboot/include/stack.h @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later +/* Copyright 2013-2019 IBM Corp. */ + +#ifndef __STACKFRAME_H +#define __STACKFRAME_H + +#include <mem-map.h> + +#define STACK_ENTRY_OPAL_API 0 /* OPAL call */ +#define STACK_ENTRY_HMI 0x0e60 /* Hypervisor maintenance */ +#define STACK_ENTRY_RESET 0x0100 /* System reset */ +#define STACK_ENTRY_SOFTPATCH 0x1500 /* Soft patch (denorm emulation) */ + +#if HAVE_BIG_ENDIAN +#define STACK_TOC_OFFSET 40 +#else +#define STACK_TOC_OFFSET 24 +#endif + +/* Safety/ABI gap at top of stack */ +#define STACK_TOP_GAP 0x100 + +/* Remaining stack space (gap included) */ +#define NORMAL_STACK_SIZE (STACK_SIZE/2) + +/* Emergency (re-entry) stack size */ +#define EMERGENCY_STACK_SIZE (STACK_SIZE/2) + +/* Offset to get to normal CPU stacks */ +#define CPU_STACKS_OFFSET (CPU_STACKS_BASE + \ + NORMAL_STACK_SIZE - STACK_TOP_GAP) + +/* Offset to get to emergency CPU stacks */ +#define EMERGENCY_CPU_STACKS_OFFSET (CPU_STACKS_BASE + NORMAL_STACK_SIZE + \ + EMERGENCY_STACK_SIZE - STACK_TOP_GAP) + +/* Gap below the stack. If our stack checker sees the stack below that + * gap, it will flag a stack overflow + */ +#define STACK_SAFETY_GAP 512 + +/* Warning threshold, if stack goes below that on mcount, print a + * warning. + */ +#define STACK_WARNING_GAP 2048 + +#define STACK_CHECK_GUARD_BASE 0xdeadf00dbaad300 +#define STACK_INT_MAGIC 0xb1ab1af00ba1234ULL + +#ifndef __ASSEMBLY__ + +#include <stdint.h> +#include <opal-api.h> + +/* This is the struct used to save GPRs etc.. on OPAL entry + * and from some exceptions. It is not always entirely populated + * depending on the entry type + */ +struct stack_frame { + /* Standard 112-byte stack frame header (the minimum size required, + * using an 8-doubleword param save area). The callee (in C) may use + * lrsave; we declare these here so we don't get our own save area + * overwritten */ + uint64_t backchain; + uint64_t crsave; + uint64_t lrsave; + uint64_t compiler_dw; + uint64_t linker_dw; + uint64_t tocsave; + uint64_t paramsave[8]; + + /* Space for stack-local vars used by asm. At present we only use + * one doubleword. */ + uint64_t locals[1]; + + /* Interrupt entry magic value */ + uint64_t magic; + + /* Entry type */ + uint64_t type; + + /* GPR save area + * + * We don't necessarily save everything in here + */ + uint64_t gpr[32]; + + /* Other SPR saved + * + * Only for some exceptions. + */ + uint32_t cr; + uint32_t xer; + uint32_t dsisr; + uint64_t ctr; + uint64_t lr; + uint64_t pc; + uint64_t msr; + uint64_t cfar; + uint64_t srr0; + uint64_t srr1; + uint64_t hsrr0; + uint64_t hsrr1; + uint64_t dar; +} __attribute__((aligned(16))); + +/* Backtrace entry */ +struct bt_entry { + unsigned long sp; + unsigned long pc; + unsigned long exception_type; + unsigned long exception_pc; +}; + +/* Backtrace metadata */ +struct bt_metadata { + unsigned int ents; + unsigned long token; + unsigned long r1_caller; + unsigned long pir; +}; + +/* Boot stack top */ +extern void *boot_stack_top; + +/* Create a backtrace */ +void backtrace_create(struct bt_entry *entries, unsigned int max_ents, + struct bt_metadata *metadata); + +/* Convert a backtrace to ASCII */ +extern void backtrace_print(struct bt_entry *entries, + struct bt_metadata *metadata, char *out_buf, + unsigned int *len, bool symbols); + +/* For use by debug code, create and print backtrace, uses a static buffer */ +extern void backtrace(void); + +/* For use by exception debug code, supply an r1 */ +extern void backtrace_r1(uint64_t r1); + +#ifdef STACK_CHECK_ENABLED +extern void check_stacks(void); +#else +static inline void check_stacks(void) { } +#endif + +#endif /* __ASSEMBLY__ */ +#endif /* __STACKFRAME_H */ + |