diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/backtrace/backtrace.c | 49 |
1 files changed, 3 insertions, 46 deletions
diff --git a/common/backtrace/backtrace.c b/common/backtrace/backtrace.c index 506d4a482..907117f36 100644 --- a/common/backtrace/backtrace.c +++ b/common/backtrace/backtrace.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ @@ -37,47 +37,6 @@ struct frame_record { uintptr_t return_addr; }; -/* - * Strip the Pointer Authentication Code (PAC) from the address to retrieve the - * original one. - * - * The PAC field is stored on the high bits of the address and defined as: - * - PAC field = Xn[54:bottom_PAC_bit], when address tagging is used. - * - PAC field = Xn[63:56, 54:bottom_PAC_bit], without address tagging. - * - * With bottom_PAC_bit = 64 - TCR_ELx.TnSZ - */ -#if ENABLE_PAUTH -static uintptr_t demangle_address(uintptr_t addr) -{ - unsigned int el, t0sz, bottom_pac_bit; - uint64_t tcr, pac_mask; - - /* - * Different virtual address space size can be defined for each EL. - * Ensure that we use the proper one by reading the corresponding - * TCR_ELx register. - */ - el = get_current_el(); - - if (el == 3U) { - tcr = read_tcr_el3(); - } else if (el == 2U) { - tcr = read_tcr_el2(); - } else { - tcr = read_tcr_el1(); - } - - /* T0SZ = TCR_ELx[5:0] */ - t0sz = tcr & 0x1f; - bottom_pac_bit = 64 - t0sz; - pac_mask = (1ULL << bottom_pac_bit) - 1; - - /* demangle the address with the computed mask */ - return (addr & pac_mask); -} -#endif /* ENABLE_PAUTH */ - static const char *get_el_str(unsigned int el) { if (el == 3U) { @@ -104,9 +63,8 @@ static bool is_address_readable(uintptr_t addr) * stack contains a PAC. It must be stripped to retrieve the return * address. */ - addr = demangle_address(addr); + xpaci(addr); #endif - if (el == 3U) { ats1e3r(addr); } else if (el == 2U) { @@ -257,9 +215,8 @@ static void unwind_stack(struct frame_record *fr, uintptr_t current_pc, * the stack contains a PAC. It must be stripped to retrieve the * return address. */ - call_site = demangle_address(call_site); + xpaci(call_site); #endif - /* * If the address is invalid it means that the frame record is * probably corrupted. |