Author: mhorne Date: Thu Aug 13 14:17:36 2020 New Revision: 364192 URL: https://svnweb.freebsd.org/changeset/base/364192
Log: Small fixes in locore.S - Properly set up the frame pointer - Hang if we return from mi_startup - Whitespace Clearing the frame pointer marks the end of the backtrace. This fixes "bt 0" in ddb, which previously would unwind one frame too far. Reviewed by: jhb Differential Revision: https://reviews.freebsd.org/D26016 Modified: head/sys/riscv/riscv/locore.S Modified: head/sys/riscv/riscv/locore.S ============================================================================== --- head/sys/riscv/riscv/locore.S Thu Aug 13 14:14:51 2020 (r364191) +++ head/sys/riscv/riscv/locore.S Thu Aug 13 14:17:36 2020 (r364192) @@ -223,19 +223,21 @@ va: csrw sscratch, t0 /* Initialize stack pointer */ - la s3, initstack_end - mv sp, s3 + la sp, initstack_end + /* Clear frame pointer */ + mv s0, zero + /* Allocate space for thread0 PCB and riscv_bootparams */ addi sp, sp, -(PCB_SIZE + RISCV_BOOTPARAMS_SIZE) & ~STACKALIGNBYTES /* Clear BSS */ - la s0, _C_LABEL(__bss_start) - la s1, _C_LABEL(_end) + la t0, _C_LABEL(__bss_start) + la t1, _C_LABEL(_end) 1: - sd zero, 0(s0) - addi s0, s0, 8 - bltu s0, s1, 1b + sd zero, 0(t0) + addi t0, t0, 8 + bltu t0, t1, 1b /* Fill riscv_bootparams */ la t0, pagetable_l1 @@ -259,6 +261,11 @@ va: call _C_LABEL(initriscv) /* Off we go */ call _C_LABEL(mi_startup) + /* We should never reach here, but if so just hang. */ +2: + wfi + j 2b + /* * Get the physical address the kernel is loaded to. Returned in s9. */ @@ -350,7 +357,7 @@ ENTRY(mpentry) ld sp, 0(t0) /* Get the kernel's load address */ - jal get_physmem + jal get_physmem /* Setup supervisor trap vector */ lla t0, mpva _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
