From: Marc Hartmayer <mhartmay@xxxxxxxxxxxxx> Define and use a macro for the stack frame size. While at it, fix whitespace in the `gs_handler_asm` block. Signed-off-by: Marc Hartmayer <mhartmay@xxxxxxxxxxxxx> Co-developed-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx> Reviewed-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx> Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20230307091051.13945-7-mhartmay@xxxxxxxxxxxxx Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx> --- s390x/Makefile | 2 +- lib/s390x/asm-offsets.c | 1 + s390x/cstart64.S | 2 +- s390x/flat.lds.S | 4 +++- s390x/macros.S | 4 ++-- s390x/snippets/c/flat.lds.S | 6 ++++-- s390x/gs.c | 38 +++++++++++++++++++++---------------- 7 files changed, 34 insertions(+), 23 deletions(-) diff --git a/s390x/Makefile b/s390x/Makefile index 6732b48..ab146eb 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -162,7 +162,7 @@ $(SNIPPET_DIR)/c/%.gbin: $(SNIPPET_DIR)/c/%.o $(snippet_lib) $(FLATLIBS) $(SNIPP $(OBJCOPY) -I binary -O elf64-s390 -B "s390:64-bit" $< $@ lds-autodepend-flags = -MMD -MF $(dir $*).$(notdir $*).d -MT $@ -%.lds: %.lds.S +%.lds: %.lds.S $(asm-offsets) $(CPP) $(lds-autodepend-flags) $(CPPFLAGS) -P -C -o $@ $< .SECONDEXPANSION: diff --git a/lib/s390x/asm-offsets.c b/lib/s390x/asm-offsets.c index f612f32..188dd2e 100644 --- a/lib/s390x/asm-offsets.c +++ b/lib/s390x/asm-offsets.c @@ -87,6 +87,7 @@ int main(void) OFFSET(STACK_FRAME_INT_GRS0, stack_frame_int, grs0); OFFSET(STACK_FRAME_INT_GRS1, stack_frame_int, grs1); DEFINE(STACK_FRAME_INT_SIZE, sizeof(struct stack_frame_int)); + DEFINE(STACK_FRAME_SIZE, sizeof(struct stack_frame)); return 0; } diff --git a/s390x/cstart64.S b/s390x/cstart64.S index 6f83da2..468ace3 100644 --- a/s390x/cstart64.S +++ b/s390x/cstart64.S @@ -38,7 +38,7 @@ start: /* setup stack */ larl %r15, stackptr /* Clear first stack frame */ - xc 0(160,%r15), 0(%r15) + xc 0(STACK_FRAME_SIZE,%r15), 0(%r15) /* setup initial PSW mask + control registers*/ larl %r1, initial_psw lpswe 0(%r1) diff --git a/s390x/flat.lds.S b/s390x/flat.lds.S index 952f6cd..0cb7e38 100644 --- a/s390x/flat.lds.S +++ b/s390x/flat.lds.S @@ -1,3 +1,5 @@ +#include <asm/asm-offsets.h> + SECTIONS { .lowcore : { @@ -44,6 +46,6 @@ SECTIONS /* * stackptr set with initial stack frame preallocated */ - stackptr = . - 160; + stackptr = . - STACK_FRAME_SIZE; stacktop = .; } diff --git a/s390x/macros.S b/s390x/macros.S index 13cff29..e2a56a3 100644 --- a/s390x/macros.S +++ b/s390x/macros.S @@ -21,14 +21,14 @@ /* Save the stack address in GR2 which is the first function argument */ lgr %r2, %r15 /* Allocate stack space for called C function, as specified in s390 ELF ABI */ - slgfi %r15, 160 + slgfi %r15, STACK_FRAME_SIZE /* * Save the address of the interrupt stack into the back chain * of the called function. */ stg %r2, STACK_FRAME_INT_BACKCHAIN(%r15) brasl %r14, \c_func - algfi %r15, 160 + algfi %r15, STACK_FRAME_SIZE RESTORE_REGS_STACK lpswe \old_psw .endm diff --git a/s390x/snippets/c/flat.lds.S b/s390x/snippets/c/flat.lds.S index 9e5eb66..468b5f1 100644 --- a/s390x/snippets/c/flat.lds.S +++ b/s390x/snippets/c/flat.lds.S @@ -1,3 +1,5 @@ +#include <asm/asm-offsets.h> + SECTIONS { .lowcore : { @@ -18,9 +20,9 @@ SECTIONS . = 0x4000; /* * The stack grows down from 0x4000 to 0x2000, we pre-allocoate - * a frame via the -160. + * a frame via the -STACK_FRAME_SIZE. */ - stackptr = . - 160; + stackptr = . - STACK_FRAME_SIZE; stacktop = .; /* Start text 0x4000 */ .text : { diff --git a/s390x/gs.c b/s390x/gs.c index 4993eb8..9ae893e 100644 --- a/s390x/gs.c +++ b/s390x/gs.c @@ -9,6 +9,7 @@ * Janosch Frank <frankja@xxxxxxxxxxxxx> */ #include <libcflat.h> +#include <asm/asm-offsets.h> #include <asm/page.h> #include <asm/facility.h> #include <asm/interrupt.h> @@ -35,22 +36,27 @@ static inline unsigned long load_guarded(unsigned long *p) /* guarded-storage event handler and finally it calls gs_handler */ extern void gs_handler_asm(void); - asm(".globl gs_handler_asm\n" - "gs_handler_asm:\n" - " lgr %r14,%r15\n" /* Save current stack address in r14 */ - " aghi %r15,-320\n" /* Allocate stack frame */ - " stmg %r0,%r13,192(%r15)\n" /* Store regs to save area */ - " stg %r14,312(%r15)\n" - " la %r2,160(%r15)\n" /* Store gscb address in this_cb */ - " .insn rxy,0xe30000000049,0,160(%r15)\n" /* stgsc */ - " lg %r14,24(%r2)\n" /* Get GSEPLA from GSCB*/ - " lg %r14,40(%r14)\n" /* Get GSERA from GSEPL*/ - " stg %r14,304(%r15)\n" /* Store GSERA in r14 of reg save area */ - " brasl %r14,gs_handler\n" /* Jump to gs_handler */ - " lmg %r0,%r15,192(%r15)\n" /* Restore regs */ - " aghi %r14, 6\n" /* Add lgg instr len to GSERA */ - " br %r14\n" /* Jump to next instruction after lgg */ - " .size gs_handler_asm,.-gs_handler_asm\n"); + asm ( ".macro STGSC args:vararg\n" + " .insn rxy,0xe30000000049,\\args\n" + " .endm\n" + " .globl gs_handler_asm\n" + "gs_handler_asm:\n" + " lgr %r14,%r15\n" /* Save current stack address in r14 */ + ".Lgs_handler_frame = 16*8+32+" xstr(STACK_FRAME_SIZE) "\n" + " aghi %r15,-(.Lgs_handler_frame)\n" /* Allocate stack frame */ + " stmg %r0,%r13,192(%r15)\n" /* Store regs to save area */ + " stg %r14,312(%r15)\n" + " la %r2," xstr(STACK_FRAME_SIZE) "(%r15)\n" /* Store gscb address in this_cb */ + " STGSC %r0," xstr(STACK_FRAME_SIZE) "(%r15)\n" + " lg %r14,24(%r2)\n" /* Get GSEPLA from GSCB*/ + " lg %r14,40(%r14)\n" /* Get GSERA from GSEPL*/ + " stg %r14,304(%r15)\n" /* Store GSERA in r14 of reg save area */ + " brasl %r14,gs_handler\n" /* Jump to gs_handler */ + " lmg %r0,%r15,192(%r15)\n" /* Restore regs */ + " aghi %r14, 6\n" /* Add lgg instr len to GSERA */ + " br %r14\n" /* Jump to next instruction after lgg */ + ".size gs_handler_asm,.-gs_handler_asm\n" + ); void gs_handler(struct gs_cb *this_cb) { -- 2.39.2
